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  • 1.
    Björnängen, Therese
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Fors, Rickard
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Eltsev, Yurii
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Rapp, Östen
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Vortex correlation parallel in underdoped and perpendicular to H vertical bar vertical bar ab YBa2Cu3O7-delta2004In: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 408-10, p. 564-565Article in journal (Refereed)
    Abstract [en]

    Vortex correlation in the region of the depinning transition has been studied in twinned YBa2Cu3O7-delta single crystals with T-c approximate to 80 K. Transport properties along the e-axis were performed in magnetic fields parallel to the ab-plane, using the pseudo flux-transformer method. By rotating the sample around the c-axis, both longitudinal and transverse vortex correlation could be studied. Compared to optimally doped samples, transverse vortex velocity correlation was enhanced at high fields, while longitudinal correlation remained qualitatively the same.

  • 2.
    Fors, Rickard
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Khartsev, Sergiy
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Grishin, Alexander M.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Pohl, A.
    Westin, G.
    Sol-gel derived versus pulsed laser deposited epitaxial La0.67Ca0.33MnO3 films: structure, transport and effects of post-annealing2004In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 467, no 02-jan, p. 112-116Article in journal (Refereed)
    Abstract [en]

    Epitaxial La0.67Ca0.33MnO3 films have been prepared on LaAlO3 crystals by pulsed laser deposition (PLD) and by a novel all-alkoxide sol-gel technique. Different out-of-plane lattice parameters are found for the as-prepared films, and scanning electron microscopy shows a more porous structure for sol-gel films as compared to PLD films. These differences are largely removed by post annealing at 1000 degreesC. Transport measurements show maximum temperature coefficient of resistivity of 8.2% K-1 at 258 K (PLD) and 6.1% K-1 at 241 K (sol-gel) and colossal magnetoresistance at 560 kA/m of 35% at 263 K (PLD) and 32% at 246 K (sol-gel).

  • 3.
    Fors, Rickard
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Pohl, A.
    Khartsev, Sergey
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Grishin, Alexander
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Westin, G.
    Comparison of sol-gel derived and pulsed laser deposited epitaxial La0.67Ca0.33MnO3 films for IR bolometer2004In: Integration Of Advanced Micro-And Nanoelectronic Devices-Critical Issues And Solutions / [ed] Morais, J; Kumar, D; Houssa, M; Singh, RK; Landheer, D; Ramesh, R; Wallace, RM; Guha, S; Koinuma, H, 2004, Vol. 811, p. 379-384Conference paper (Refereed)
    Abstract [en]

    Epitaxial La0.67Ca0.33MnO3 films have been prepared on LaAlO3 crystals by pulsed laser deposition (PLD) and by a novel all-alkoxide sol-gel technique. Different out-of-plane lattice parameters are found for the as-prepared films, and scanning electron microscopy shows a more porous structure for sol-gel films as compared to PLD films. These differences are largely removed by post-annealing at 1000 degreesC. Transport measurements show maximum temperature coefficient of resistivity of 8.2 % K-1 at 258 K (PLD) and 6.1% K-1 at 241 K (sol-gel) and colossal magnetoresistance at 7 kOe of 35% at 263 K (PLD) and 32% at 246 K (sol-gel).

  • 4.
    Manuilov, Sergey A.
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Fors, Rickard
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Khartsev, Sergiy
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Grishin, Alexander M.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Pulsed Laser Deposited Y3Fe5O12 Films for Magnetostatic Wave Band Pass Filters2009In: Solid State Phenomena, ISSN 1012-0394, E-ISSN 1662-9779, Vol. 152-153, p. 377-380Article in journal (Refereed)
    Abstract [en]

    Y3Fe5O12 (YIG) films were pulsed laser deposited onto the Gd3Ga5O12(111) substrates. Processing conditions were optimized to obtain films with a narrow ferromagnetic resonance (FMR) linewidth: 0.9 Oe in 1.22 mu m thick YIG at 9 GHz. Due to sharp film-to-substrate interface YIG films remain strained hence possess unusually high lattice mismatch induced uniaxial anisotropy H-u = - 880 Oe. We fabricated and tested magnetostatic surface wave (MSSW) band pass hybrid-type filters with YIG film lain on transducers alumina board. MSSW filter with antennas areal size of 2 mm(2) at 7.5 GHz shows insertion loss - 9 dB and a resonant 3 dB bandwidth as narrow as 12.5 MHz.

  • 5.
    Manuilov, Sergey A.
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Fors, Rickard
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Khartsev, Sergiy
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Grishin, Alexander M.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Submicron Y3Fe5O12 Film Magnetostatic Wave Band Pass Filters2009In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 105, no 3Article in journal (Refereed)
    Abstract [en]

    Thin Y3Fe5O12 (YIG) films were pulsed laser deposited onto Gd3Ga5O12 (111) and (001) substrates. Processing conditions were optimized to obtain compressively strained films with a ferromagnetic resonance linewidth at 9 GHz as narrow as 0.9 Oe and high uniaxial magnetic anisotropy H-u=-880 Oe. Several designs of magnetostatic surface wave (MSSW) bandpass filters were fabricated and tested: 0.45 and 0.22 mu m thick YIG films lain on transducers alumina board and with microstripe transducers defined directly onto YIG film, with effective antenna areal sizes of 2 and 0.4 mm(2). The MSSW filter with 2 mm(2) antenna shows, at 7.5 GHz, insertion loss -9 dB and a resonant -3 dB bandwidth as narrow as 12.5 MHz.

  • 6. Pohl, A.
    et al.
    Westin, G.
    Ottosson, M.
    Grishin, Alexander
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Khartsev, Sergiy
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Fors, Rickard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Porous and dense perovskite films2008In: NANOSTRUCTURED MATERIALS AND NANOTECHNOLOGY / [ed] Mathur, S; Singh, M, 2008, Vol. 28, no 6, p. 153-163Conference paper (Refereed)
    Abstract [en]

    La0.5Sr0.5CoO3 (LSCO) and La 0.67Ca0.33MnO3 (LCMO) films were prepared by sol-gel techniques and their structural and transport properties investigated. Films were spin-coated onto (001) LaAlO3 (LAO), (001) SrTiO 3 (STO), Pt/TiO2/SiO2/Si, and Al 2O3 substrates, and heated to 800C. The structural properties were investigated using X-ray diffraction, scanning and transmission electron microscopy (SEM and TEM). SEM studies showed that the films were crack-free and adhered well to the substrates. No preferential orientation of the perovskite films was observed on Si- or Pt/TiO2/SiO 2/Si-substrates, but films deposited on LAO and STO showed good alignment with the substrate. Transport measurements of epitaxial LCMO films show maximum temperature coefficient of resistivity (TCR) of 6.1% K-1 at 241 K and colossal magnetoresistance (CMR) of 32% at 246 K. The conductivity LSCO polycrystalline film was 1.7 mcm, while a epitaxial film had a conductivity of around 1.9 mcm.

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