We investigate temperature dependence of the Gilbert damping of a magnetization of the Fe sublattice in rare-earth permanent magnets R2Fe14B ( R is a rare-earth element). Assuming that the spin angular moment of Fe dissipates to the phonon system via a localized 4f electron system, which interacts with the phonon system, we obtain the formulation of the Gilbert damping constant α on the basis of the ligand field theory and evaluate the temperature and material dependence of \alpha . We show that the Gilbert damping of the magnetization arises only in certain temperature regions due to the discrete energy structure of the 4f electron system.
- Dynamical magnetic property
- Gilbert damping
- ligand field theory
- rare-earth permanent magnets
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering