Results 161 to 170 of about 421 (189)
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Towards Magneto-Acoustic Oscillators
2017Spin 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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Magneto-acoustic oscillations in thallium
Physics Letters, 1962Longitudinal 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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Damping of nonlinear magneto-acoustic waves
Journal of Plasma Physics, 1978Nonlinear 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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Magneto-acoustic phonon antiresonances in Wannier–Stark superlattices
Solid-State Electronics, 1998We 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 +7 more
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Bioelectric current image reconstruction from magneto-acoustic measurements
IEEE Transactions on Medical Imaging, 1988An investigation is conducted of the possibility of reconstructing images of current dipoles in a volume conductor from data obtained by the magnetoacoustic technique. A modified form of the algebraic reconstruction technique (ART) is used. Reconstruction results of simulated data show that it is possible to find the location, relative magnitude, and ...
M R, Islam, B C, Towe
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M-sequence-coded excitation for magneto-acoustic imaging
Medical & Biological Engineering & Computing, 2018Magneto-acoustic imaging is a novel functional imaging method to electrical characteristics of tissue. It provides valuable tools for diagnosing early stage tumor and monitoring bioelectrical current. Common single short-pulse excitation limits SNR due to the short-pulse duration and low power of magneto-acoustic signal.
Shunqi Zhang +3 more
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Magneto-Acoustic Properties of UCuGe Single Crystal
Journal of Low Temperature Physics, 2009We report on results of sound velocity and sound-attenuation measurements performed on the antiferromagnetic (TN=48 K) UCuGe. The measurements have been done on a UCuGe single crystal at different frequencies for longitudinal ultrasound waves propagating along the [001] direction in static (up to 18 T) and pulsed (up to 60 T) magnetic fields applied ...
Yasin, S. +4 more
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Maximum likelihood estimator for magneto-acoustic localisation
1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2002This paper is devoted to the localization of magneto-acoustic sources moving in a straight line at a constant speed. Our technique is based on the association of narrow band acoustic signals and magnetostatic measurements. First of all, we describe features that make possible the association of magnetic and acoustic data, secondly, we show that the ...
G. Dassot, R. Blanpain, C. Jauffret
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, 2023 Magneto-acoustic oscillations in a toroidal plasma
Plasma Physics, 1978Toroidal 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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