Electromagnetic excitation and dispersion of the velocity of sound in nickel in high magnetic fields

An experimental study is made of frequency resonant changes in surface impedance produced by excitation of standing sound waves in a nickel monocrystal. Also studied are dispersion of the speed of sound and damping of sound waves as a function of the magnitude of a constant magnetic field H0 at a temperature of 4.2°K. It is established that in magnetic fields exceeding the field of magnetic saturation of the specimen at low temperatures conversion of an electromagnetic wave into a sound wave within the skin layer of ferromagnetic nickel is controlled by an induction mechanism of conduction electron interaction with the lattice. This same mechanism determines sound damping in strong magnetic fields. The dispersion of the speed of sound within the specimen volume is then produced by the magnetoelastic mechanism of interaction of the magnetization M with the lattice deformation. The possibility of determining the magnetoelastic constants of nickel by electromagnetic excitation of sound is considered.

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