Results 141 to 150 of about 140,791 (178)

Magneto-acoustic oscillations in thallium

Physics Letters, 1962
Longitudinal sound wave transmission measurements were made nt frequencies up to 270 Mc/s in a single crystal of thallium. The resulting dimensions of the Fermi surface are compared with the predictions of the free electron model. The agreement is very good if a sirgle zone scheme is used, demonstrating the importance of spin-orbit effects on the band ...
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Nonlinear magneto-acoustic waves in ferromagnets

Journal of Applied Physics, 1996
The nonlinear coherent interaction of a high-frequency acoustic wave pulse with a magnetically ordered medium is studied theoretically. We consider both microscopic and phenomenological theories of the formation of nonlinear magneto-acoustic waves in a ferromagnet.
G. T. Adamashvili, A. A. Maradudin
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Damping of nonlinear magneto-acoustic waves

Journal of Plasma Physics, 1978
Nonlinear magneto-acoustic waves in a turbulent plasma are simulated by collisional MHD equations. Damping of these waves due to electrical conductivity arising from micro-instabilities and collisional viscosity are analyzed. Numerical investigation of competing effects due to non-linearity and dissipation has been carried out.
G. L. Kalra, V. B. Bhatia
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Towards Magneto-Acoustic Oscillators

2017
Spin torque oscillators (STO) were developed in 2003 and since then great progress has been made in understanding their underlying physics, frequency of operation, frequency tuning range, and functionality. These nanoscale oscillators with their octave spanning frequency tuning range have been touted for many applications including neuromorphic ...
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Nonlinear magneto-acoustic dispersive waves

Astrophysics and Space Science, 1977
The multiple time scale method is applied to investigate the nonlinear magneto-acoustic dispersive waves in a collisional plasma. Whereas in the absence of collisions these waves are modulationally stable, the collisions render them modulationally unstable.
Malik, S. K., Singh, M.
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A magneto-acoustic method for the noninvasive measurement of bioelectric currents

IEEE Transactions on Biomedical Engineering, 1988
A method for the noninvasive measurement of low-level ionically conducted electric currents flowing in electrolytes and tissue is investigated. Experiments show that the application of oscillating magnetic fields to current-carrying media will cause focal Lorentz forces which generate detectable vibrations.
Bruce C. Towe, Mohammed Rezau Islam
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On the generation and radiation of magneto-acoustic waves

Journal of Fluid Mechanics, 1977
The generation, and thence the dissipation, propagation and radiation, of waves in a compressible fluid subjected to a magnetic field is studied as an extension of the ‘acoustic analogy’ (Lighthill 1952) to magneto-acoustics. A formal theory of magneto-acoustic waves introduces (i) a single differential operator describing propagation, (ii) a dynamic ...
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A theoretical model for magneto-acoustic imaging of bioelectric currents

IEEE Transactions on Biomedical Engineering, 1994
A theoretical model of magneto-acoustic current imaging is derived, based on fundamental equations of continuum mechanics and electromagnetism. In electrically active tissue, the interaction between an applied magnetic field, B, and action currents, J, creates a pressure distribution.
B J, Roth, P J, Basser, J P, Wikswo
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Magneto-acoustic oscillations in a toroidal plasma

Plasma Physics, 1978
Toroidal effects on forced axisymmetric magneto-acoustic oscillations in a conventional Tokamak plasma are investigated to first order in the inverse aspect ratio, using dissipative magnetohydrodynamic theory. It is shown that toroidal effects give rise to poloidally asymmetric components but magneto-acoustic resonance is still obtained and it is ...
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Magneto-acoustic phonon antiresonances in Wannier–Stark superlattices

Solid-State Electronics, 1998
We have measured the hopping current of electrons magnetically confined in a 1D superlattice. We find that phonon assisted hopping between Wannier–Stark states vanishes at hopping energies where the momentum of an LA phonon mode satisfies the condition of Bragg reflection in the superlattice. This effect proves that, even in the presence of an external
Nogaret A, Eaves L, Main PC, Henini M, Maude DK, Portal JC, MOLINARI, Elisa, Beaumont SP   +7 more
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