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  • 1. Adachi, N.
    et al.
    Okuda, T.
    Denysenkov, Vasyl
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Jalali-Roudsar, Amir
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Grishin, Alexander
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Magnetic properties of single crystal film Bi3Fe5O12 prepared onto Sm3(Sc, Ga)5O12(111)2002In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 242, no Part 2, 775-777 p.Article in journal (Refereed)
    Abstract [en]

    Magnetic properties of single crystal Bi3Fe5O12 has been investigated in the temperature range between 2 and 670K. The Sm3(Sc,Ga)5O12 wafer has been used for substrates. Due to the small contribution of the substrate's magnetization, the film's magnetization can be clearly estimated to be 2040G (0K) and the Curie temperature has been estimated to be around 650K.

  • 2. Akman, O.
    et al.
    Kavas, H.
    Baykal, A.
    Toprak, Muhammet S.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
    Coruh, Ali
    Aktas, B.
    Magnetic metal nanoparticles coated polyacrylonitrile textiles as microwave absorber2013In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 327, 151-158 p.Article in journal (Refereed)
    Abstract [en]

    Polyacrylonitrile (PAN) textiles with 2 mm thickness are coated with magnetic nanoparticles in coating baths with Ni, Co and their alloys via an electroless metal deposition method. The crystal structure, morphology and magnetic nature of composites are investigated by X-ray Powder diffraction, Scanning Electron Microscopy, and dc magnetization measurement techniques. The frequency dependent microwave absorption measurements have been carried out in the frequency range of 12.4-18 GHz (X and P bands). Diamagnetic and ferromagnetic properties are also investigated. Finally, the microwave absorption of composites is found strongly dependent on the coating time. One absorption peak is observed between 14.3 and 15.8 GHz with an efficient absorption bandwidth of 3.3-4.1 GHz (under -20 dB reflection loss limit). The Reflection loss (RL) can be achieved between -30 and -50 dB. It was found that the RL is decreasing and absorption bandwidth is decreasing with increasing coating time. While absorption peak moves to lower frequencies in Ni coated PAN textile, it goes higher frequencies in Co coated ones. The Ni-Co alloy coated composites have fluctuating curve of absorption frequency with respect to coating time. These results encourage further development of magnetic nanoparticle coated textile absorbers for broadband applications.

  • 3. Austrin, L.
    et al.
    Krah, Julius Hartwig
    KTH, Superseded Departments, Electrical Systems.
    Engdahl, Göran
    KTH, Superseded Departments, Electrical Systems.
    A modeling approach of a magnetic amplifier2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272, E1709-E1710 p.Article in journal (Refereed)
    Abstract [en]

    New soft magnetic materials made possible the use of the magnetic amplifier technology in designing competitive electric power supplies. This technology is used in the Swedish. fighter aircraft Gripen, being also attractive for future more electrical aircraft systems due to the possibility to achieve a compact and robust design. A modeling approach of a magnetic amplifier based on the magnetic hysteresis of the core material is presented here for a common amorphous magnetic alloy.

  • 4. Batlle, X.
    et al.
    Hattink, B. J.
    Labarta, A.
    Åkerman, Johan
    Escudero, R.
    Schuller, I. K.
    The oxidation state at tunnel junction interfaces2003In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 260, no 02-jan, 78-83 p.Article in journal (Refereed)
    Abstract [en]

    The oxidation state at the interfaces of Nb/Al-AlOx/Pb junctions is discussed. Conductance-voltage curves below and above the superconducting temperature suggest tunneling conduction, while X-ray photoelectron spectroscopy shows the existence of a thin AlOx layer at the Nb/Al interface. We demonstrate that at the usual 10(-7) Torr range of base pressures in the sputtering chamber, this is due to the time elapsed between the deposition of the Nb and Al bottom layers, in both Nb/Al-AlOx/Pb tunnel junctions and Nb/Al bilayers. We also give some direct evidence of the oxidation of the top Pb electrode on the Nb electrode surface. Such oxidation probably occurs at the pinholes of the intermediate Al-AlOx layer of the tunnel junctions, as a consequence of the oxidation state at the Nb/Al interface, which helps to avoid barrier shorts and enhances the quality of the tunnel barrier. We therefore suggest that there is oxide formation in other places besides where there is an actual oxide deposited. This is relevant for the performance of magnetic tunnel junctions since in most tunneling studies it is assumed that once the oxide is deposited, that is the only place where there is an oxide. This is also a very general statement applicable to thin film systems.

  • 5.
    Baykov, Vitaly
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Smirnova, E. A.
    Department of Theoretical Physics of Steel and Alloys, Moscow.
    Abrikosov, I. A.
    Department of Physics and Measurement Technology, Linköping University.
    Johansson, Börje
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Magnetic properties of 3d impurities in GaAs2007In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 310, no 2, 2120-2122 p.Article in journal (Refereed)
    Abstract [en]

    Electronic structure, thermodynamic, and magnetic properties of 3d-transition metal (TM) impurities in GaAs have been studied from first principles using Green's function approach. The studied TM impurities (V, Cr, Mn, and Fe) are found to form substitutional alloys on the Ga sublattice. The possibility of raising the Curie temperature TC in (GaMn) As by co-doping it with Cr impurities was examined on the basis of total energy difference between the disordered local moment (DLM) and the ferromagnetically ordered (FM) spin configurations. The calculated Curie temperature and magnetic moment have maxima for GaAs doped with Cr and Mn. The magnetic properties of Mn-doped GaAs are shown to be more sensitive to antisite As defects than those of Cr-doped GaAs. However, the Cr impurities are sensitive to the presence of acceptor defects, such as vacancies on the Ga sublattice. The investigation of the electronic structure of pseudo-ternary alloys (Ga(1-x-y)MnxCry) As has shown a mutual compensation of Mn and Cr impurities. Therefore, in order to reach the highest critical temperature, GaAs has to be separately doped with Cr or Mn impurities. The GaAs doped with Fe is found to be non-ferromagnetic.

  • 6.
    Carrander, Claes
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Mousavi, Seyedali
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Engdahl, Göran
    KTH, School of Electrical Engineering (EES).
    An application of the time-step topological model for three-phase transformer no-load current calculation considering hysteresis2017In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 423, 241-244 p.Article in journal (Refereed)
    Abstract [en]

    In many transformer applications, it is necessary to have a core magnetization model that takes into account both magnetic and electrical effects. This becomes particularly important in three-phase transformers, where the zero-sequence impedance is generally high, and therefore affects the magnetization very strongly. In this paper, we demonstrate a time-step topological simulation method that uses a lumped-element approach to accurately model both the electrical and magnetic circuits. The simulation method is independent of the used hysteresis model. In this paper, a hysteresis model based on the first-order reversal-curve has been used. © 2016 Elsevier B.V.

  • 7. Edmonds, K. W.
    et al.
    Binns, C.
    Baker, S. H.
    Maher, M. J.
    Thornton, S. C.
    Tjernberg, Oscar
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Brookes, N. B.
    Magnetism of exposed and Co-capped Fe nanoparticles2000In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 220, no 1, 25-30 p.Article in journal (Refereed)
    Abstract [en]

    The effect of capping a dilute assembly of nanoscale mass-selected Fe clusters with a Co thin film has been studied using X-ray magnetic circular dichroism (XMCD). The clusters, containing around 400 atoms, were deposited in situ from a gas-aggregation source onto highly oriented pyrolytic graphite. The exposed clusters possess magnetic moments that are enhanced compared to the bulk, by around 4% for m(spin) and around 75% for m(orb). In addition, a surface core level shifted component is observed in the L-3.2 XMCD spectrum. Upon adding the Co layer, the surface component disappears, m(orb) is decreased for the Fe clusters, and m(spin) increases. The exposed clusters are magnetically isotropic but a strong in-plans anisotropy is observed after depositing the Co overlayer. We attribute this to the shape of the Co islands in which the Fe clusters are embedded.

  • 8. Edmonds, K. W.
    et al.
    Binns, C.
    Baker, S. H.
    Maher, M. J.
    Thornton, S. C.
    Tjernberg, Oscar
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Brookes, N. B.
    Size dependence of the magnetic moments of exposed nanoscale iron particles2001In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 231, no 1, 113-119 p.Article in journal (Refereed)
    Abstract [en]

    The magnetic moments in exposed, mass-selected, nanoscale Fe clusters in the size range 1.89-2.20 nm (300-475 atoms), deposited onto graphic in situ have been measured by X-ray magnetic circular dichroism. The smallest clusters possess moments that are enhanced by around 4% for m(spin) and 80% for m(orb) and decrease towards the bulk value with increasing size. The larger clusters show an in-plane anisotropy that is consistent with the anisotropy in the orbital moment. The smallest clusters are, within experimental error, magnetically isotropic. The anisotropy constant in the 475-atom clusters is significantly higher than the bulk value.

  • 9.
    Engdahl, Göran
    et al.
    KTH, Superseded Departments, Electrical Systems.
    Krah, J. H.
    The feasibility to model a 3-leg core type medium frequency power transformer by use of a dual Cauer circuit2002In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 242, 1210-1213 p.Article in journal (Refereed)
    Abstract [en]

    A model for medium frequency power transformers is suggested, The model is able to treat arbitrary topologies by use of Cauer circuits for core and windings. An implementation example is given for a 1-phase transformer with turn ratio 1:1. The model can be extended to include winding insulation materials by use of lumped capacitive and resistive circuit elements.

  • 10. Grechnev, G. E.
    et al.
    Ahuja, R.
    Johansson, Börje
    KTH, Superseded Departments, Materials Science and Engineering.
    Eriksson, O.
    Electronic structure and magnetic properties of lithium manganese spinels2003In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 258, 287-289 p.Article in journal (Refereed)
  • 11. Holmström, Erik
    et al.
    Bergqvist, Lars
    KTH, Superseded Departments, Materials Science and Engineering.
    Skubic, Björn
    Eriksson, Olle
    Structural and magnetic aspects of multilayer interfaces2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272-276, 941- p.Article in journal (Refereed)
    Abstract [en]

    We show that it is possible to obtain quantitative information about the interface quality by considering the magnetic moments of Fe/V multilayers. We derive a parameter space describing the quality of interfaces and argue that most of the experimentally grown samples lie within a smaller segment of this space.

  • 12.
    Isaev, Eyvaz
    et al.
    Moscow State Institute of Steel and Alloys.
    Baykov, Vitaly
    KTH, Superseded Departments, Materials Science and Engineering.
    Korzhavyi, Pavel A.
    KTH, Superseded Departments, Materials Science and Engineering.
    Vekilov, Yu. Kh.
    Johansson, Börje
    KTH, Superseded Departments, Materials Science and Engineering.
    Abrikosov, Igor
    Eriksson, O.
    Intrinsic defects and transition metal impurities in GaAs2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272, no 3, 1961-1962 p.Article in journal (Refereed)
    Abstract [en]

    Thermodynamics of intrinsic point defects, 3d-transition metal (TM) impurities, and various defect pairs in GaAs have been studied by means of the locally self-consistent Green's function method. Antisite defects, As-Ga, are found to be the most energetically favorable defects in the As-rich GaAs. The studied TM impurities (V, Cr, Mn, and Fe) are found to form substitutional alloys on the Ga sublattice. The magnetic moments of TM impurities in the GaAs host are calculated under the assumption that orbital moments of TM are quenched and the total magnetization is due to spill ordering of electrons in the crystal. Thermodynamic possibility of formation of complexes between TM-atoms is investigated.

  • 13.
    Jalali-Roudsar, Amir Abbas
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Denysenkov, V.P.
    Khartsev, Sergiy
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Determination of magnetic anisotropy constants for magnetic garnet epitaxial films using ferromagnetic resonance2005In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 288, 15-21 p.Article in journal (Refereed)
    Abstract [en]

    The constants of magnetocrystalline anisotropy K-l and uniaxial anisotropy K-u are determined precisely by using ferromagnetic resonance (FMR) and a fitting procedure oil a (1 1 1) yttrium iron garnet (YIG) film made by pulsed laser deposition (PLD) technique. By applying a magnetic field in the azimuthal orientation we introduce measurement in a geometry which yields the anisotropy constants with a high accuracy. The new technique is compared with the previous analysis employing characteristic plane measurements. The new geometry yields at least 15% better accuracy in determining constant K, than by the previous method with FMR.

  • 14.
    Kahl, Sören
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Grishin, Alexander M.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Evolution of properties of epitaxial bismuth iron garnet films with increasing thickness2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 278, no 1-2, 244-255 p.Article in journal (Refereed)
    Abstract [en]

    Bismuth iron garnet (BIG) films of thicknesses from 470 to 2560 nm were prepared by pulsed laser deposition under identical deposition conditions. All films are epitaxial, bismuth deficient, and show rms surface roughnesses between 15 and 40 nm. X-ray coherence lengths decrease with increasing film thickness. Films below approximately 1 pm are free of cracks, thicker films possess a network of cracks. From fits of optical transmission spectra, real and imaginary parts of the refractive indices were found for wavelengths from 500 to 850 nm. The effects of thin film interference and surface roughness were included. With these data as input information, each of our experimental Faraday rotation spectra was described by a single diamagnetic line in visible light. The measured spectra could be reproduced and parameters of the magneto-optical transition were obtained. We observed a broadening of the transition with increasing film thickness and a red shift of the center frequency. This corresponds to our experimental observation that the wavelength of maximum Faraday rotation for BIG films in visible light shifts to longer wavelengths by almost 40 nm for a 2560-nm-thick film as compared to a 470-nm-thick film. As BIG is not thermodynamically stable, aging is a crucial question. We found that careful annealing in oxygen below the deposition temperature increases the angle of Faraday rotation, while film properties deteriorate during long annealing times at the deposition temperature.

  • 15. Kim, D. K.
    et al.
    Zhang, Y.
    Kehr, J.
    Klason, T.
    Bjelke, B.
    Muhammed, Mamoun
    KTH, Superseded Departments, Materials Science and Engineering.
    Characterization and MRI study of surfactant-coated superparamagnetic nanoparticles administered into the rat brain2001In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 225, no 02-jan, 256-261 p.Article in journal (Refereed)
    Abstract [en]

    A pre-clinical study has been carried out for the utilization of magnetite (Fe-3 O-4) nanoparticles as a diagnostic tracer for MRI. Surfactant-coated Fe3O4 nanoparticles have been synthesized by a chemical coprecipitation method with a narrow particle size of around 6 nm. Preliminary experiments demonstrated the feasibility of using superparamagnetic Fe-3 O-4 nanoparticles as contrast agents in MR imaging.

  • 16. Kim, D. K.
    et al.
    Zhang, Y.
    Voit, W.
    Rao, K. V.
    Muhammed, Mamoun
    KTH, Superseded Departments, Materials Science and Engineering.
    Synthesis and characterization of surfactant-coated superparamagnetic monodispersed iron oxide nanoparticles2001In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 225, no 02-jan, 30-36 p.Article in journal (Refereed)
    Abstract [en]

    Synthesis and coating of superparamagnetic monodispersed iron oxide nanoparticles was carried out by chemical solution method. Controlled co-precipitation technique was used to prevent undesirable critical oxidation of Fe2+. The obtained Fe3O4 nanoparticles were coated with sodium oleate. Low-held AC susceptibility and SQUID measurement show superparamagnetism with a blocking temperature around 150K, and almost immeasurable remanence and coercivity.

  • 17. Kolokoltsev, O.
    et al.
    Gomez-Arista, Ivan
    Qureshi, N.
    Acevedo, A.
    Ordonez-Romero, Cesar L.
    Grishin, Alexander
    KTH.
    Compression gain of spin wave signals in a magnonic YIG waveguide with thermal non-uniformity2015In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 377, 1-5 p.Article in journal (Refereed)
    Abstract [en]

    We report on the observation of the compression gain of the signals carried by surface spin waves (MSSWs) in yittrium iron garnet films as a result of non-uniform optical heating of the spin wave medium. Efficient gain takes place if a frequency downshift of the spin wave spectrum induced by the heating is compensated by the corresponding non-uniformity of the bias magnetic field. It is proposed that the effect can be understood in part as an interaction between spin waves and a thermally induced potential well in the sample.

  • 18. Kolokoltsev, O.
    et al.
    Gómez-Arista, I.
    Qureshi, N.
    Acevedo, A.
    Ordóñez-Romero, C. L.
    Grishin, Alexander M.
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Erratum to: Compression gain of spin wave signals in a magnonic YIG waveguide with thermal non-uniformity (J. Magn. Magn. Mater. (2014) 377C (1-5) DOI 10.1016/j.jmmm.2014.10.001)2016In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 409, 163-165 p.Article in journal (Refereed)
  • 19.
    Korenivski, Vladislav
    KTH, Superseded Departments, Physics.
    GHz magnetic film inductors2000In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 215, 800-806 p.Article in journal (Refereed)
    Abstract [en]

    Use of magnetic films for miniaturization of planar inductors operating at ultra-high frequencies is reviewed. Materials and design aspects determining the efficiency of the devices are analyzed. Mechanisms involved in magnetic dissipation and their role in limiting the device operation frequency range and quality factor are discussed. Typical inductor geometries are considered. A magnetically sandwiched strip inductor is argued to hold a promise for GHz applications.

  • 20.
    Kravets, A. F.
    et al.
    Institute of Magnetism, National Academy of Sciences of Ukraine.
    Timoshevskii, A. N.
    Institute of Magnetism, National Academy of Sciences of Ukraine.
    Yanchitsky, B. Z.
    Institute of Magnetism, National Academy of Sciences of Ukraine.
    Salyuk, O. Y.
    Institute of Magnetism, National Academy of Sciences of Ukraine.
    Yablonovskii, S. O.
    Institute of Magnetism, National Academy of Sciences of Ukraine.
    Andersson, Sebastian
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
    Korenivski, Vladislav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
    Exchange-induced phase separation in Ni-Cu films2012In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 324, no 13, 2131-2135 p.Article in journal (Refereed)
    Abstract [en]

    Magneto-structural properties of films of diluted ferromagnetic alloys NixCu1-x in the concentration range 0.7 < x < 1.0 are studied experimentally. Films deposited by magnetron sputtering show partial phase separation, as evidenced by structural analysis and ferromagnetic resonance measurements. The phase diagram of the NixCu1-x bulk system is obtained using numerical theoretical analysis of the electronic structure, taking into account the interatomic exchange interactions. The results confirm the experimentally found partial phase separation, explain it as magnetic in origin, and indicate an additional metastable region connected with the ferromagnetic transition in the system.

  • 21. Le Bacq, O.
    et al.
    Johansson, Börje
    Eriksson, O.
    First principles calculations of the magnetic profiles of the Fe-V multilayers2001In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 226, 1722-1724 p.Article in journal (Refereed)
  • 22. Mikhailova, M.
    et al.
    Bobrysheva, N.
    Ravot, D.
    Muhammed, Mamoun
    KTH, Superseded Departments, Materials Science and Engineering.
    Magnetic dilution of complex ferrates2002In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 242, 741-743 p.Article in journal (Refereed)
    Abstract [en]

    The magnetic and structural properties of La1+0.85yBa1-0.85yFeyAl1-yO4 (0.0056less than or equal toyless than or equal to0.088) solid solutions have been investigated to demonstrate the dependence of the valence state of iron atoms on the composition of sublattice. From the magnetic susceptibility measurements. the coexistence of Fe(II)-Fe(III) hetero valence states has been confirmed and the results showed the tendency of these atoms to form clusters.

  • 23. Muduli, Pranaba
    et al.
    Herfort, J.
    Schönherr, H. -P
    Ploog, K. H.
    Strong dependence of the magnetic anisotropy on the growth temperature of Fe3+xSi1-x (x=0.34) films on GaAs(113)A substrates2009In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 321, no 20, 3488-3492 p.Article in journal (Refereed)
    Abstract [en]

    A strong dependence of the magnetic anisotropy on the growth temperature of Fe3+xSi1-x Heusler alloy films on GaAs(113)A substrates is reported for a composition of 17.5 at:% Si (x = 0.34). This composition of Fe-Si alloy lies within the stable phase of the technologically promising Heusler alloy Fe3Si. The layers grown at the optimized growth temperature of 250 degrees C exhibit the expected four-fold magnetic anisotropy, which arises from the magnetocrystalline anisotropy and the large demagnetization energy, similar to Fe films. However, an unexpected strong uniaxial magnetic anisotropy is found for samples grown at 200 and 400 degrees C with the easy axes along < 33 (2) over bar > and <(1) over bar 10 >, respectively. The uniaxial magnetic anisotropy of these samples are shown to be related to the inferior interface quality.

  • 24.
    Muduli, Pranaba K.
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Herfort, J.
    Schoenherr, H. -P
    Ploog, K. H.
    Spin wave excitations in Fe films grown on GaAs(113)A substrates2008In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 320, no 21, 2835-2838 p.Article in journal (Refereed)
    Abstract [en]

    The spin wave excitation and its size effect has been studied in Al- capped Fe. lms grown on lowsymmetry GaAs( 113) A substrates. The temperature dependence of saturation magnetization follows an effective Bloch's law as long as magnetization remains larger than about 70% of its saturation value. A signi. cant increase of the spin wave parameter B is found in Al- capped ultrathin Fe. lms grown on GaAs( 113) A compared to bulk Fe, Fe. lms on GaAs( 0 01) and other systems. This is explained as a result of the reduction in uniaxial magnetic anisotropy observed in this orientation for the same thickness range. However, this observed uniaxial magnetic anisotropy is found to be a likely reason for stabilizing the ferromagnetism.

  • 25. Murzina, T. V.
    et al.
    Razdolski, I. E.
    Aktsipetrov, O. A.
    Grishin, Alexander M.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Khartsev, Sergiy
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Nonlinear magneto-optical effects in all-garnet magnetophotonic crystals2009In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 321, no 7, 836-839 p.Article in journal (Refereed)
    Abstract [en]

    Nonlinear magneto-optical properties of all-garnet magnetophotonic crystals composed of alternating layers of ferromagnetic Bi3Fe5O12 ( BIG) and Sm3Ga5O12 quarter-wavelength layers with a half-wavelength BIG microcavity mode are presented. The samples are grown by rf-magnetron sputtering on non-magnetic GGG substrate. Many-fold enhancement of the magnetization-induced effects in second-harmonic generation (SHG) as compared with linear magneto-optical effects are observed: the SHG magnetic contrast up to 50% and magnetization-induced rotation of the polarization plane of about 901 are measured at the resonance microcavity wavelengh of lambda = 779 nm. (C) 2008 Elsevier B. V. All rights reserved.

  • 26.
    Nguyen, Thi Ngooc Ahn
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Benatmane, Nadjib
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Fallahi, Vahid
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Fang, Yeyu
    Mohseni, Seyed Majid
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Dumas, R. K.
    Åkerman, Johan
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    [Co/Pd](4)-Co-Pd-NiFe spring magnets with highly tunable and uniform magnetization tilt angles2012In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 324, no 22, 3929-3932 p.Article in journal (Refereed)
    Abstract [en]

    By varying the Pd thickness (t(Pd)) from 0 to 8 nm in [Co/Pd](4)/Co/Pd(t(Pd))/NiFe exchange springs, we demonstrate (i) continuous tailoring of the exchange coupling between a [Co/Pd](4)/Co layer with perpendicular anisotropy, and a NiFe layer with an in-plane easy axis, (ii) tuning of the NiFe out-of-plane magnetization angle from 20 degrees to 80 degrees, and(iii) an up to two-fold increase in the NiFe damping. The partial decoupling also results in a highly uniform NiFe magnetization. These properties make [Co/Pd](4)/Co/Pd(t(Pd))/NiFe spring magnets ideal candidates for use as tilted polarizers, by combining stable and well-defined spin directions of its carriers with a high degree of angular freedom.

  • 27. Ozkaya, T.
    et al.
    Baykal, A.
    Toprak, Muhammet S.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Koseoglu, Y.
    Durmus, Z.
    Reflux synthesis of Co3O4 nanoparticles and its magnetic characterization2009In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 321, no 14, 2145-2149 p.Article in journal (Refereed)
    Abstract [en]

    Co3O4 nanoparticles have been prepared for the first time via reflux method, as an alternative low-temperature high-yield process, starting from one single precursor. A plausible mechanism is suggested for the synthetic process. XRD, TEM, FTIR and VSM were used for the structural, morphological, spectroscopic, and magnetic characterization of the product respectively. X-ray diffraction line profile fitting showed that average particle size of the sample is 28 nm. Morphology of the synthesized powder was observed to be thin nanosheets with a thickness of 2-3 nm based on SEM and TEM analyses. Magnetic measurements showed a deviation of the Neel temperature from the bulk value which is attributed to the finite size effects. A loop shift with an enhanced coercivity is observed in the field-cooled hysteresis loops. The opening of the hysteresis loop reveals the existence of the spin-glass like surface spins of the Co3O4 nanoparticles.

  • 28. Peil, Oleg E.
    et al.
    Johansson, Börje
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Ruban, Andrei V.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Ab initio investigation of magnetic ordering and spin-glass transition in Cu-rich Cu-Mn systems2007In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 310, no 2, 1561-1563 p.Article in journal (Refereed)
  • 29. Ponomareva, A.
    et al.
    Isaev, E. I.
    Pourovskii, L.
    Vekilov, Y. K.
    Johansson, Börje
    KTH, Superseded Departments, Materials Science and Engineering.
    Abrikosov, I. A.
    Ab initio investigations of surface magnetism in V-Mo2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272-276, 1198-1200 p.Article in journal (Refereed)
    Abstract [en]

    Magnetic properties of the (0 0 1) surface of pure vanadium and disordered binary Mo-V alloys have been investigated from the first-principles by means of the LMTO-GF-CPA technique, the fixed spin moment method, and the direct exchange Monte-Carlo statistical mechanics simulations. The binary alloys, as well as pure constituent metals, are nonmagnetic in the bulk. However, we have shown that the (1 0 0) surface of uniformly random and segregated Mo-V alloys is magnetic. The magnetism of the V monolayer on the Mo(0 0 1) surface has also been studied. In particular, the surface relaxation effect has resulted in a reduction of the magnetic moments for V atoms, but the surface magnetism is still present in the system. Including of semi-core states as valence ones does not alter this conclusion.

  • 30. Ponomareva, A. V.
    et al.
    Pourovskii, L. V.
    Isaev, E. I.
    Vekilov, Y. K.
    Johansson, Börje
    KTH, Superseded Departments, Materials Science and Engineering.
    Abrikosov, I. A.
    Surface magnetism of vanadium-based binary alloys: first principles investigations2003In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 258, 128-130 p.Article in journal (Refereed)
  • 31. Sanyal, B.
    et al.
    Bergqvist, Lars
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Eriksson, O.
    Johansson, Börje
    Electronic structure and magnetism of diluted magnetic semiconductors and derivatives2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272, E1581-E1582 p.Article in journal (Refereed)
  • 32. Sbiaa, R.
    et al.
    Al-Omari, I. A.
    Al Bahri, M.
    Kharel, P. R.
    Ranjbar, M.
    Åkerman, Johan
    KTH, School of Engineering Sciences (SCI), Applied Physics. University of Gothenburg, Sweden.
    Sellmyer, D. J.
    Ni thickness influence on magnetic properties (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy2017In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 441, 585-589 p.Article in journal (Refereed)
    Abstract [en]

    We present a study of perpendicular magnetic anisotropy in [Co/Ni(t)/Co/Pt]×8 multilayers for use as free layers in magnetic tunnel junctions (MTJ) and spin valves. The thickness t of the Ni sub-layer was varied and the resulting magnetic properties were investigated. As determined from magnetic force microscopy and magnetometry measurements, all multilayers exhibited a perpendicular magnetic anisotropy with an increase of saturation magnetization with thickness t. From the temperature dependence of the magnetization, well described by a Bloch law, we find that the spin-wave stiffness constant of the [Co/Ni(t)/Co/Pt]×8 multilayers is larger compared to (Co/Ni) multilayers. These multilayers could be the basis for spintronic devices where the reduction of total Pt content could help to reduce the damping constant while keeping the magnetic anisotropy energy relatively high. These are conflicting requirements needed for high performance magnetic memory devices.

  • 33. Sertkol, M.
    et al.
    Koseoglu, Y.
    Baykal, A.
    Kavas, H.
    Toprak, Muhammet S.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Synthesis and magnetic characterization of Zn0.7Ni0.3Fe2O4 nanoparticles via microwave-assisted combustion route2010In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 322, no 7, 866-871 p.Article in journal (Refereed)
    Abstract [en]

    We report on the synthesis of Zn0.7Ni0.3Fe2O4 nanoparticles via microwave assisted combustion route by using urea as fuel. XRD and FT-IR analyses confirm the composition and structure as spinel ferrite. The crystallite size estimated from XRD (16.4nm) and the magnetic core size(15.04nm) estimated from VSM agree well, while a slightly smaller magnetic diameterre reflects a very thin magnetically dead layer on the surface of the nanoparticles. Morphological investigation of the products was done by TEM which revealed the existence of irregular shapes such spherical, spherodial and polygon. Magnetization measurements performed on Zn0.7Ni0.3Fe2O4 nanoparticles showed that saturation was not attained at even in the high magnetic field. The sample shows superparamagnetic behavior at around the room temperature and ferromagnetic behavior below the blocking temperature which is measured as 284 K.

  • 34. Sharma, P
    et al.
    Gupta, Amita
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Owens, F J
    Inoue, A
    Rao, K Venkat
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Room temperature spintronic material - Mn-doped ZnO revisited2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 282, 115-121 p.Article in journal (Refereed)
    Abstract [en]

    We report the first observations of ferromagnetism above room temperature for small atomic percentages of Mn doped in ZnO. In a homogeneous bulk pellet sample sintered at low temperatures (similar to 500degrees C Mn is found to carry an average moment of 0.16 mu(B) per Mn ion. We have obtained room temperature ferromagnetic ordering in samples containing around 2% Mn in the form of powder, bulk pellets and 2-3 mum, thick transparent laser-ablated films. The new capability to fabricate ferromagnetic Mn-doped ZnO semiconductors promises new devices related to spintronic devices as well as magneto-optic components.

  • 35. Singh, Prashant
    et al.
    Rahaman, Moshiour
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Mookerjee, Abhijit
    Magnetic transitions in Ni1-xMox and Ni1-xWx disordered alloys2011In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 323, no 20, 2478-2482 p.Article in journal (Refereed)
    Abstract [en]

    We present a mean-field study of the magnetic phase diagram of Ni1-xMox and Ni1-xWx alloys. The pair energies that enter the internal energy part of the free energy are obtained from a first-principles calculation. We try to understand why spin-glass phase is not observed in these alloys.

  • 36.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Brucas, Rimantas
    Uppsala University.
    Stanciu, V.
    Uppsala Universitet.
    Nordblad, P.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Enhanced magnetic moment at the interfaces in Fe81Ni19/Co superlattices2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 277, no 1-2, 228-235 p.Article in journal (Refereed)
    Abstract [en]

    The structure and magnetic properties of BCC (0 0 1) oriented Fe81Ni19/Co superlattices grown on MgO(0 0 1) substrates by magnetron sputtering are presented. The variation of magnetic moment with the compn. and with the interface d. was studied. A model in which the magnetic moment per atom at the interfaces is different from that in the interior region was used for the anal. The extension of the interface region is ∌3.5 monolayers and the magnetic moment in this region is enhanced by ∌0.3 ΌB/atom, compared to the interior regions. The superlattices form a BCC-like structure with a slight orthorhombic distortion, which gives rise to a weak in-plane uniaxial anisotropy. [on SciFinder(R)]

  • 37.
    Soroka, Inna
    et al.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Origin of uniaxial in-plane magnetic anisotropy in Fe81Ni19/Co superlattices.2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272, 1247-1248 p.Article in journal (Refereed)
    Abstract [en]

    The authors have studied the in-plane magnetic uniaxial anisotropy, for (0 0 1)-oriented Fe81Ni19/Co superlattices grown on MgO (0 0 1) by magnetron sputtering. The layers in the superlattices have a BCC structure with a slight orthorhombic distortion, which gives rise to a weak in-plane uniaxial anisotropy. [on SciFinder(R)]

  • 38.
    Stanciu, V.
    et al.
    Uppsala Universitet.
    Soroka, Inna
    Uppsala Universitet.
    Lu, J.
    Uppsala Universitet.
    Hjörvarsson, Björgvin
    Uppsala Universitet.
    Nordblad, P.
    Uppsala Universitet.
    Dynamic magnetic properties of Ni81Fe19/Al2O3 multilayers2005In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 286, no SI, 446-449 p.Article in journal (Refereed)
    Abstract [en]

    Discontinuous magnetic metal-insulator multilayers of Ni81Fe19 and Al2O3 were prepd. by sequential magnetron sputtering in an UHV chamber. Ni81Fe19 layers of nominal thickness 8 Å form clusters of quite uniform size having an av. diam. of ∌24 Å. A layered structure is maintained in the out-of-plane direction, but a random distribution of the metal clusters occurs in plane. These films have magnetic properties that vary strongly with the Al2O3 layer thickness-exhibiting ferromagnetic, spin glass like and superparamagnetic behavior as this layer thickness is increased from 10 via 19 to 31

  • 39.
    Ström, Valter
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Rao, K. V.
    A novel method for magnetic imaging: determination of local in-plane susceptibility at a surface2000In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 215, 723-725 p.Article in journal (Refereed)
    Abstract [en]

    Using a combined read/write head, a new instrument has been developed to determine the local in-plane magnetic susceptibility in magnitude and orientation at a micron length scale. Applications of this instrument to image the susceptibility distribution over ferromagnetic, as well as superconducting surfaces are presented. As far as we know, such microscopic magnetic information cannot be measured by other techniques.

  • 40. Sukstanskii, A.
    et al.
    Korenivski, Vladislav
    KTH, Superseded Departments, Physics.
    Magnetostatic spin waves in metallic multilayers2000In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 218, no 03-feb, 144-150 p.Article in journal (Refereed)
    Abstract [en]

    Magnetostatic spin waves in a multilayer film consisting of two magnetic conductive layers separated by a nonmagnetic conductor are analyzed. Two magnetostatic spin wave branches are shown to exist and their dispesion laws are analyzed. Structures of finite width, which are relevant for device applications, are also considered.

  • 41.
    Torabzadeh-Tari, Mohsen
    et al.
    KTH, Superseded Departments, Electrical Systems.
    Engdahl, Göran
    KTH, Superseded Departments, Electrical Systems.
    A quasi-static modelling approach of electromechanical actuators2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272, E1705-E1707 p.Article in journal (Refereed)
    Abstract [en]

    This paper presents a suggested modelling approach of an electromechanical actuator, where the performance of involved semiconductor devices and tentative motors as PM, transversal, torus, and switched reluctance electrical machines are condensed into look-up tables. Current and voltages are then desccribed in form of quasi-static rms values quantities, and the actuator mechanical outputs in momentary forces and velocities. The proposed modelling approach is considered to be one ingredient in future build-up of models of entire MEA aircrafts.

  • 42. Upadhyay, Ramesh V.
    et al.
    Parekh, Kinnari
    Belova, Lyubov M.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Engineering Material Physics.
    Rao, K. V.
    Low-field DC-magnetization study of Ho3+-doped Mn-Zn ferrite ferrofluid2007In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 311, no 1, 106-110 p.Article in journal (Refereed)
    Abstract [en]

    The physical and magnetic properties of magnetic nanoparticles are crucial for their effectiveness and reliability in biomedical applications. In this article, we report the synthesis of a stable Ho-substituted Mn-Zn ferrite ferrofluid and its physical and magnetic properties. Substitution by rare earth metal plays an important role in determining the magneto-crystalline anisotropy in 4f-3d intermetallic compounds. Ho3+ substitution not only enhanced the magnetic anisotropy but also produced strong spin frustration at low temperature. The field dependence of blocking temperature shows H-2/3 dependency in the entire range of field, i.e., 10-700 Oe, indicating the emergence of Ising spins characteristics in the present system.

  • 43.
    Urech, Mattias
    et al.
    KTH, Superseded Departments, Physics.
    Korenivski, Vladislav
    KTH, Superseded Departments, Physics.
    Haviland, David B.
    KTH, Superseded Departments, Physics.
    Magnetoresistance in Co/AlOx/Co tunnel junction arrays2002In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 249, 513-518 p.Article in journal (Refereed)
    Abstract [en]

    Lateral arrays of Co/AlOx/Co junctions with dimensions down to 60 nin and inter-junction separations similar to60-100 nm have been fabricated and analyzed for possible coherent tunneling effects. Extra attention is paid to avoid uncertainties due to inconsistencies in switching and/or resistance of successive barriers. We observe similar to10% magnetoresistance enhancement at moderate bias in double junctions that cannot be accounted for by a simple model of two resistsors in series.

  • 44.
    Urech, Mattias
    et al.
    KTH, Superseded Departments, Physics.
    Korenivski, Vladislav
    KTH, Superseded Departments, Physics.
    Haviland, David B.
    KTH, Superseded Departments, Physics.
    Johansson, Jan
    KTH, Superseded Departments, Physics.
    Spin injection in ferromagnet-superconductor/ normal-ferromagnet structures2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272-276/ Suppl, 1469-1470 p.Article in journal (Refereed)
    Abstract [en]

    We have fabricated multi-terminal devices consisting of three parallel ferromagnetic ( FM) electrodes with tunnel junction contacts to a 100 nm wide Al strip. A spin polarized current injected from one FM electrode into the Al strip can be detected at the other FM electrodes. The spin diffusion length and polarization in Al are measured at room temperature (RT), and at 4 K: No magnetoresistance (MR) over two junctions in series could be measured with the strip in the normal state. A weak MR is observed in the superconducting (S) state.

  • 45. Valldor, M.
    et al.
    Esmaeilzadeh, S.
    Andersson, Magnus
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Morawski, A.
    Preparation and characterisation of the double perovskite Sr2TaMnO62006In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 299, no 1, 161-169 p.Article in journal (Refereed)
    Abstract [en]

    The presented compound, Sr2TaMnO6, has a weak, disordered magnetic structure. The metal oxide was prepared under high isostatic oxygen pressure. The doubling of the perovskite structure was proven with electron diffraction and powder neutron diffraction. Combining neutron- and X-ray diffraction data, the room-temperature structure was modelled with the Rietveld method. Both octahedral positions are partially occupied by Mn and Ta, but with different Mn/Ta ratios. AC- and DC-magnetic measurements indicate a magnetic transition at about 17 K and the AC-magnetic susceptibility, both real and imaginary part, is frequency dependent, suggesting that the material has a spin-glass feature. The magnetic spins freeze during a wide temperature range and a possible explanation is a competative situation between the double exchange (ferromagnetism) and the super-exchange (anti-ferromagnetism).

  • 46. Zamani, Atieh
    et al.
    Hallén, Anders
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Nordblad, Per
    Andersson, Gabriella
    Hjörvarsson, Björgvin
    Jönsson, Petra E.
    Tuning magnetic properties by hydrogen implantation in amorphous Fe100-xZrx thin films2013In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 346, 138-141 p.Article in journal (Refereed)
    Abstract [en]

    Thin films of amorphous Fe100-xZrx (x=7.6-12.9 at%) were synthesized by dc-magnetron sputtering. Samples with compositions of x=11.6 and 12.0 at% were hydrogenated by implantation. The Curie temperature increases with hydrogen content from 232 K for as-grown Fe88Zr12 to 370 K for a sample hydrogenated to 31 at%. The coercivity decreases dramatically upon hydrogenation, yielding films with tunable transition temperatures and soft magnetic properties.

  • 47. Åkerman, Johan
    et al.
    Escudero, R.
    Leighton, C.
    Kim, S.
    Rabson, D. A.
    Dave, R. W.
    Slaughter, J. M.
    Schuller, I. K.
    Criteria for ferromagnetic-insulator-ferromagnetic tunneling2002In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 240, no 03-jan, 86-91 p.Article in journal (Refereed)
    Abstract [en]

    The Rowell criteria, commonly used to identify tunneling in magnetic tunnel junctions (MTJ), are scrutinized. While neither the exponential-thickness dependence of the conductivity nor fits of non-linear transport data are found to be reliable tunneling criteria, the temperature-dependent conductivity does remain a solid criterion. Based on experimental studies of the bias and temperature-dependent resistance and magnetoresistance of MTJs, with and without shorted barriers, a new set of criteria is formulated.

1 - 47 of 47
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