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  • 72.80.Ey  (2)
  • 76  (2)
  • Springer  (4)
  • Oxford University Press
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic disaccommodation in normal spinel structures (1991)
    Springer
    Applied physics 52 (1991), S. 242-246 
    Details
    ISSN: 1432-0630
    Keywords: 75.60 ; 76
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Magnetic disaccommodation is investigated for ferrous ferrites with normal spinel structure. This study shows the presence of a new relaxation process in the temperature region IV (≃285 K) that has not been detected in inverse spinels. A numerical analysis of the isochronal spectra reveals that it is composed of two simple Debye processes with activation energies close to 0.75 eV and 0.80 eV, and preexponential factors 3×10−13 s. This relaxation is attributed to the formation of an induced anisotropy due to jumps of B-Fe ions into vacancies (as process III), but in presence of a divalent cation occupying an A-site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324585
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of resonant and non-resonant tunneling in asymmetric coupled quantum wells (1993)
    Springer
    Applied physics 56 (1993), S. 40-42 
    Details
    ISSN: 1432-0630
    Keywords: 73.40.Gk ; 72.80.Ey ; 73.20.Dx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Within the framework of the effective mass approximation, coherent oscillations of a photoexcited electron wave packet in an asymmetric coupled quantum well structure have been studied using a time-dependent Schrödinger equation. In the method of calculation, the continuity of the current across a semiconductor heterojunction is considered. The amplitude and period of the electronic is obtained and in the case of high bias, it is found the existence of electric field-induced tunelling to semiconductor bulk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351901
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  • 3
    Electronic Resource
    Electronic Resource
    Micromagnetic model of the Richter-type relaxation in vacancy-doped Fe3O4 (1986)
    Springer
    Applied physics 39 (1986), S. 287-289 
    Details
    ISSN: 1432-0630
    Keywords: 75.60 ; 76
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Isothermal disaccommodation curves in vacancy-doped magnetite at room temperature show a typical Richter-type behaviour. Magnetic susceptibility decreases asymptotically according to a relaxation time of about 102 s, which is analyzed in terms of a progressive stabilization of the domains walls. The relaxation strength, vacancies and the restoring pressure on the Bloch walls are closely related.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617274
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  • 4
    Electronic Resource
    Electronic Resource
    Ge diffusion into GaAs by pulsed laser irradiation (1988)
    Springer
    Applied physics 46 (1988), S. 191-196 
    Details
    ISSN: 1432-0630
    Keywords: 61.70.Tm ; 79.20.Ds ; 72.80.Ey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ge diffusion into GaAs from thin evaporated layers as sources is reported. Irradiation with aQ-switched ruby laser gives rise ton-type diffused layers of a thickness from 240 to 710 Å. A strong compensation of the diffused layers, that cannot be removed by thermal annealing, was observed. From the present experimental results it can be inferred that the diffusion coefficient increases at the melting point by 5 to 6 orders of magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939263
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