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  • 1.
    Baykov, Vitaly
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Isaev, P. A.
    Moscow State Institute of Steel and Alloys.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Vekilov, Y. K.
    Moscow State Institute of Steel and Alloys.
    Abrikosov, I. A.
    Linköping University.
    Ab Initio Studies of the Energy Characteristics and Magnetic Properties of Point Defects in GaAs2005In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 47, no 10, p. 1831-1836Article in journal (Refereed)
    Abstract [en]

    The formation energies of intrinsic point defects and solution energies of transition metal impurities in gallium arsenide are determined on the basis of ab initio calculations using the method of a locally self-consistent Green's function, which is a generalization of the coherent potential approximation. Based on the calculated energies, the conclusion is made that the As-Ga antisite defect is the most common intrinsic defect in GaAs. Calculations showed that transition metal impurities, except for Ni, preferentially occupy gallium sites substitutionally. The magnetic moments of impurity atoms are calculated as a function of the chemical environment. It is shown that, in compensated GaAs, Mn atoms tend to form clusters.

  • 2.
    Kar'kin, I. N.
    et al.
    Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ekaterinburg 620990, Russia..
    Kar'kina, L. E.
    Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ekaterinburg 620990, Russia..
    Gornostyrev, Yu. N.
    Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ekaterinburg 620990, Russia.;Inst Quantum Mat Sci, Ekaterinburg 620007, Russia..
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ekaterinburg 620990, Russia..
    Kinetics of Early Decomposition Stages in Diluted bcc Fe-Cu-Ni-Al Alloy: MC plus MD Simulation2019In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 61, no 4, p. 601-608Article in journal (Refereed)
    Abstract [en]

    A combined approach including the Monte Carlo and molecular-dynamics simulation, decomposition kinetics and segregation formation in the multicomponent low-alloy Fe-1.5Cu-2Ni-1.5Al (at %) alloy is studied. It is shown that the formation of Cu nanoparticles surface-enriched with Ni and Al (coprecipitation mode) includes several stages: (i) the formation of clusters consisting of several Cu atoms, (ii) their enrichment with Ni and Al atoms, and (iii) redistribution of Ni and Al atoms with the formation of a surface layer providing stabilization of Cu nanoparticles. Observed structural features of segregations and their stability in Fe-Cu-Ni-Al alloys is discussed.

  • 3. Kar'kin, I. N.
    et al.
    Kar'kina, L. E.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Gornostyrev, Yu. N.
    Monte Carlo Simulation of the Kinetics of Decomposition and the Formation of Precipitates at Grain Boundaries of the General Type in Dilute BCC Fe-Cu Alloys2017In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 59, no 1, p. 106-113Article in journal (Refereed)
    Abstract [en]

    The kinetics of decomposition of a polycrystalline Fe-Cu alloy and the formation of precipitates at the grain boundaries of the material have been investigated theoretically using the atomistic simulation on different time scales by (i) the Monte Carlo method implementing the diffusion redistribution of Cu atoms and (ii) the molecular dynamics method providing the atomic relaxation of the crystal lattice. It has been shown that, for a small grain size (D similar to 10 nm), the decomposition in the bulk of the grain is suppressed, whereas the copper-enriched precipitates coherently bound to the matrix are predominantly formed at the grain boundaries of the material. The size and composition of the precipitates depend significantly on the type of grain boundaries: small precipitates (1.2-1.4 nm) have the average composition of Fe-40 at % Cu and arise in the vicinity of low-angle grain boundaries, while larger precipitates that have sizes of up to 4 nm and the average composition of Fe-60 at % Cu are formed near grain boundaries of the general type and triple junctions.

  • 4. Kuzovlev, Y. E.
    et al.
    Medvedev, Y. V.
    Grishin, Alexander M.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Quantum discreteness effects and flicker fluctuations in tunneling conductivity2002In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 44, no 5, p. 843-851Article in journal (Refereed)
    Abstract [en]

    An analysis of events in the tunneling junction shows that the interaction of one-electron processes in a many-electron system may be a source of scale-invariant low-frequency fluctuations of conductivity (the interaction consists in that the quantum probability of an electron transition depends on fast random changes in the environment in the course of the transition, including the changes caused by analogous transitions). The theory relates flicker fluctuations in the tunneling conductivity to the discrete character of the spectrum of electron states and explains the nonlinearity of the noise-current characteristic observed in nanocomposites.

  • 5. Medvedev, Y. V.
    et al.
    Grishin, Alexander M.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    The charge state of conducting fine-dispersed systems in an insulating matrix2001In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 43, no 5, p. 935-940Article in journal (Refereed)
    Abstract [en]

    The influence of fluctuations in the number of Fermi particles on the charge state of fine-dispersed metallic grains in an insulating matrix is investigated. It is suggested that the system of grains does not form a tunnel medium and that charge transfer between metallic elements of the composite occurs due to thermal excitations of electrons over barriers. As follows from a calculation of the grand partition function, the average charge of the ith grain is a nonlinear function of the potential V-i of the conductor.

  • 6.
    Razumovskiy, Vsevolod I.
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Vekilov, Yu. Kh.
    Razumovskii, I. M.
    Ruban, Andrei V.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Butrim, V. N.
    Mironenko, V. N.
    Effect of Alloying Elements and Impurities on Interface properties in Aluminum Alloys2011In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 53, no 11, p. 2189-2193Article in journal (Refereed)
    Abstract [en]

    The segregation energies of B, Si, P, Cr, Ni, Zr, and Mg on the special grain boundary (GB) Σ5 (210)[100] and on the open (210) surface of aluminum have been determined and the GB splitting energy has been calculated by the density functional theory methods. It has been shown that all elements listed above enrich the GB; for B, Si, P, Cr, Ni and Zr, Mg, interstitial and substitutional sites are preferred, respectively. The effect of alloying elements on the GB binding has been estimated using the parameter η equal to the change in the fracture work of the aluminum GB when adding alloying element atoms. From the viewpoint of strengthening the GB binding forces, Zr, Cr, Ni, and Mg are efficient, Si and B are neutral and phosphorus weakens GBs.

  • 7. Shkar, V. F.
    et al.
    Denisenkov, V. P.
    Grishin, Alexander M.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Yalali, A. A.
    Khartsev, Sergiy
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Nikolaev, E. I.
    Sayapin, V. N.
    A manifestation of magnetism of bismuth in iron garnet films2003In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 45, no 12, p. 2334-2337Article in journal (Refereed)
    Abstract [en]

    Bismuth iron garnet films prepared through electron-beam and laser-induced evaporation on (001)-oriented substrates of scandium gallium gadolinium garnet are investigated using ferromagnetic resonance. It is assumed that the additional minima observed in the angular dependence of the resonance field can be associated with the magnetic moment of bismuth ions.

  • 8. Shkar, V. F.
    et al.
    Nikolaev, E. I.
    Sayapin, V. N.
    Linnik, A. I.
    Denysenkov, V. P.
    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, Material Physics, MF.
    Structure and properties of deposited yttrium iron garnet films2005In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 47, no 6, p. 1107-1110Article in journal (Refereed)
    Abstract [en]

    Ferromagnetic resonance (FMR) and vibrating-sample magnetometer techniques were used to study the nature of the structural characteristics of yttrium iron garnet films deposited through either liquid phase epitaxy or laser evaporation on a (111)-oriented gallium gadolinium garnet substrate. It was proved that, based on the experimentally observed cubic magnetic anisotropy, deposited films should be considered to be single crystals. However, the absence of the FMR domain branch in a nonsaturated film and the shape of the magnetization curve indicate that a deposited film when demagnetized does not have a domain structure, as would be expected for a single-crystal film. According to the model proposed, a deposited film consists of close-packed single-crystal fragments with equal crystallographic orientation, the boundaries between which are in a partially atomically disordered state. As a result, such a film is both locally and macroscopically anisotropic, like a continuous single crystal. This film can split into domains only within a fragment (as is the case in a magnetic granular polycrystal); however, this does not happen, because the linear dimensions of a submicroscopic fragment are smaller than the equilibrium domain width.

  • 9.
    Vilkov, E. A.
    et al.
    Russian Acad Sci, Kotelnikov Inst Radioengn & Elect, Moscow, Russia..
    Mikhailov, G. M.
    Russian Acad Sci, Inst Microelect Technol & High Purity Mat, Chernogolovka, Russia..
    Nikitov, S. A.
    Russian Acad Sci, Kotelnikov Inst Radioengn & Elect, Moscow, Russia..
    Safin, A. R.
    Natl Res Univ Moscow Power Engn Inst, Moscow, Russia..
    Logunov, M. V.
    Russian Acad Sci, Kotelnikov Inst Radioengn & Elect, Moscow, Russia..
    Korenivski, Vladislav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics. Royal Inst Technol, Stockholm, Sweden..
    Chigarev, S. G.
    Russian Acad Sci, Kotelnikov Inst Radioengn & Elect, Moscow, Russia..
    Fomin, L. A.
    Russian Acad Sci, Inst Microelect Technol & High Purity Mat, Chernogolovka, Russia..
    Dynamics of Spatially Inhomogeneous Spin Polarization of Nonequilibrium Conduction Electrons in Magnetic Transitions2019In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 61, no 6, p. 941-951Article in journal (Refereed)
    Abstract [en]

    The equation of the dynamics of the magnetic moment motion that has been averaged over the ensemble of nonequilibrium spin-injected electrons in a ferromagnetic transition in the presence of exchange interaction, interaction with an external electromagnetic field, and a thermostat has been obtained taking into account the spatial inhomogeneity of the charge carrier distribution. It has been shown that taking into account the spatial inhomogeneity of the charge carrier distribution in the equation of the dynamics of the magnetic moment motion allows for describing the various processes of electron transfer in the magnetic transition. The probability of quantum transitions of electrons with opposite spin directions, which determine spin relaxation in interaction with a thermostat, has been estimated. It has been shown that the anisotropy of the radiation medium is determined not only by the anisotropy of the sd-exchange tensor, but also by the additional anisotropy that is caused by the electron impulse derivatives of this tensor. The considered phenomena have a great potential for the detection of new effects and development of new devices based on them, including compact tunable radiation sources in the terahertz frequency range, which is obviously difficult to generate.

1 - 9 of 9
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