Precessional, relaxation, and elastic oscillations in a ferromagnet in the region of orientational phase transitions
Buchel'nikov V. D., Shavrov V. G.
The effect of magnetization relaxation on the spectrum of precessional (spin) and elastic oscillations of a ferromagnet in the region of orientational phase transitions is examined theoretically. Near an orientational phase transitions, all oscillation modes (both spin and elastic modes) can become purely relaxation oscillations. A relaxation mode is a soft mode at the point of an orientational phase transition. Consequently, the 100% decrease in the sound velocity predicted by previous theories cannot occur. © 1994 American Institute of Physics.