Magnetic Excitations in Locally Non-Equilibrium Continuum
A.F. Kabychenkov
Fryazino Filial of V.A. Kotel'nikov Institute of Radioengineering and Electronics of RAS, Vvedensky sq. 1, Fryazino, Moscow region, 141190, Russia
Received: March 21, 2012; in final form: January 25, 2013
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On the basis of locally non-equilibrium thermodynamics the equation for dynamics of the magnetic moment vector is derived. For a magneto disordered continuum the spectrum of locally non-equilibrium fluctuations is determined. It is shown that the spectrum is composed of electromagnetic-spin branches, which contain energy gaps and spin-electromagnetic ones which do not. Unstable modes in diamagnets are found. The dispersion relation and frequency dependence of the damping coefficient are determined for coupled waves of the magnetic vector potential and magnetization. It is shown that there exist frequency regions of transmission and non-transmission. Frequencies of the undamped waves and constant-phase damped waves can be located in these regions.

DOI: 10.12693/APhysPolA.123.695
PACS numbers: 41.20.-q