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  • PLASMA PHYSICS  (7)
  • Magnetism  (3)
  • 72.20  (2)
  • INSTRUMENTATION AND PHOTOGRAPHY  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of temperature on the validity of the einstein relation in heavily doped semiconductors (1980)
    Springer
    Applied physics 23 (1980), S. 241-244 
    Details
    ISSN: 1432-0630
    Keywords: 72.20 ; 85.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An analytical expression of the modified form of the Einstein relation in heavily doped semiconductors in which Gaussian band tails are formed near the lower limit of heavy doping is derived for studying the temperature dependence of the diffusivity-mobility ratio of the carriers in such semiconductors. It is found that, with increasing temperature from relatively low values, the ratio first increases in a nonlinear manner and then decreases till, at high temperatures, it approaches its value corresponding to the non-degenerate condition resulting in a peak over a narrow range of temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00914906
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Oscillatory effective mass in degenerate narrow-gap semiconductors in a quantizing magnetic field (1981)
    Springer
    Applied physics 25 (1981), S. 105-108 
    Details
    ISSN: 1432-0630
    Keywords: 85.30 ; 72.20 ; 72.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An attempt is made to study the effect of a quantizing magnetic field on the effective electron mass in degeneraten-type narrow-gap semiconductors at low temperatures. It is found, takingn-Hg1−x Cd x Te as an example, that the effective electron mass shows an oscillatory magnetic-field dependence as is expected because of the dependence of the effective mass in degenerate non-parabolic bands on Fermi energy which oscillates with changing magnetic field. The amplitude of oscillations is, however, found to be significantly influenced by the alloy composition whereas the period is found to be independent of the band non-parabolicity, i.e. of the compositional parameter in ternary semiconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901280
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  • 3
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    Spin pumping damping and magnetic proximity effect in Pd and Pt spin-sink layers (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-07-13
    Description: Author(s): M. Caminale, A. Ghosh, S. Auffret, U. Ebels, K. Ollefs, F. Wilhelm, A. Rogalev, and W. E. Bailey Ultrathin films of the heavy elements Pd and Pt are widely used in spintronics as converters between charge and spin currents and vice versa. One open question has been whether the strongly paramagnetic nature of these elements influences the interconversion process. The authors show, using a combination of ferromagnetic resonance and x-ray magnetic circular dichroism measurements, that a related spin current absorption process (spin pumping damping) responds to the presence of ferromagnetic order in the polarizable Pd and Pt layers. They observe a change in the thickness dependence of spin current absorption when the Pd and Pt layers are in direct contact with a ferromagnet, compared with when they are in indirect contact. This change correlates with the presence of induced magnetic moments in Pd and Pt as revealed by element-specific x-ray magnetic circular dichroism magnetometry. The results show that the decoherence process for spin current in such layers is not independent of geometry, but rather is influenced by the presence of induced ferromagnetic order. [Phys. Rev. B 94, 014414] Published Tue Jul 12, 2016
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Spin-cluster excitations in the rare-earth kagome system Nd_{3}Ga_{5}SiO_{14} (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-12-04
    Description: Author(s): S. Ghosh, S. Datta, H. Zhou, M. J. R. Hoch, C. R. Wiebe, P. Schlottmann, and S. Hill Spin-cluster excitations induced by microwave radiation have been detected as a function of an applied magnetic field in the rare-earth kagome system Nd 3 Ga 5 SiO 14 . The results are interpreted using a Heisenberg model which allows for anisotropic exchange interactions between neighboring spins. At a m... [Phys. Rev. B 90, 224405] Published Wed Dec 03, 2014
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Pd magnetism induced by indirect interlayer exchange coupling (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-09
    Description: Author(s): W. E. Bailey, A. Ghosh, S. Auffret, E. Gauthier, U. Ebels, F. Wilhelm, and A. Rogalev We show that very large paramagnetic moments are created in ultrathin Pd layers through indirect interlayer exchange coupling. Pd L -edge x-ray magnetic circular dichroism measurements show Pd moments in [Pd(2.5 nm)/Cu(3 nm)/Ni 81 Fe 19 (5 nm)/Cu(3 nm)] 20 superlattices, which are ferromagnetically aligne... [Phys. Rev. B 86, 144403] Published Mon Oct 08, 2012
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Nonlinear evolution of a large-amplitude circularly polarized Alfven wave: Low beta (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The nature of turbulent cascades arising from the parametric instabilities of a monochromatic field-aligned large-amplitude circularly polarized Alfven wave is investigated via direct numerical simulation for the case of low plasma Beta and no wave dispersion. The magnetohydrodynamic code permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Anisotropic turbulent cascades, similar to those found in early incompressible two-dimensional simulations, occur after nonlinear saturation of the parallel propagating decay instability. The turbulent spectrum can be divided into three regimes: the lowest wave numbers are dominated by lower sideband remnants of the parametric process, intermediate wave numbers display nearly incompressible dynamics, and the highest wave numbers are dominated by acoustic turbulence.
    Keywords: PLASMA PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; A7; p. 13,351-13,362
    Format: text
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  • 7
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    Nonlinear evolution of a large-amplitude circularly polarized Alfven wave: High beta (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The nonlinear dynamics following saturation of the parametric instabilities of a monochromatic field-aligned large-amplitude circularly polarized Alfven wave is investigated via direct numerical simulation in the case of high plasma beta and no wave dispersion. The magnetohydrodynamic (MHD) code permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Turbulent cascades develop after saturation of two coupled oblique three-wave parametric instabilities; one of which is an oblique filamentationlike instability reported earlier. Remnants of the parametric processes, as well as of the original Alfven pump wave, persist during late nonlinear times. Nearly incompressible MHD features such as spectral anisotropies appear as well.
    Keywords: PLASMA PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; A10; p. 19,289-19,300
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  • 8
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    The onset of Alfvenic turbulence (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An investigation is conducted on how low-frequency MHD oscillations in a warm plasma may undergo a transition from a coherent state to one of turbulence. A driven/dissipative derivative nonlinear Schroedinger equation is derived from the fluid equations. The time evolution of an arbitrary spectrum of waves is analyzed in the case where one k-mode is unstable, with the rest damped. It is found that the transition from order to chaos in the driven/dissipative system is correlated with the existence or absence of 'breathing' solitons in the associated conservative system.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids (ISSN 0031-9171); 30; 1371-138
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  • 9
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    Parametric instabilities of a large-amplitude circularly polarized Alfven wave - Linear growth in two-dimensional geometries (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The growth of parametric instabilities, which may lead to the development of a turbulent cascade, is studied using an MHD code that permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Parametric instabilities associated with a parallel-propagating decay instability are found to dominate the low-beta case. An obliquely propagating filamentationlike instability dominates the high-beta case. The nonlinear growth of the nth harmonic of a daughter wave growing as a factor of n times the fundamental's growth rate is found in both cases. Nonlinear saturation is caused by the parallel decay instability in the low-beta case and by the oblique filamentationlike instability in the high-beta case.
    Keywords: PLASMA PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A9; p. 15,561-15,570.
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  • 10
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    Chaotic behaviour of high Mach number flows (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The stability of the super-Alfvenic flow of a two-fluid plasma model with respect to the Mach number and the angle between the flow direction and the magnetic field is investigated. It is found that, in general, a large scale chaotic region develops around the initial equilibrium of the laminar flow when the Mach number exceeds a certain threshold value. After reaching a maximum the size of this region begins shrinking and goes to zero as the Mach number tends to infinity. As a result high Mach number flows in time independent astrophysical plasmas may lead to the formation of 'quasi-shocks' in the presence of little or no dissipation.
    Keywords: PLASMA PHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 148; 1 Ju
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