MICROMAGNETIC THEORY OF SKIN WAVES IN RARE-EARTH TRANSITION-METAL COMPOUNDS

The micromagnetic theory is a simple and powerful method to calculate the spin-wave dispersion relation in the long-wavelength region. The c alculation has been performed within the framework of the two-sublatti ce model which is the adequate micromagnetic description for rare-eart h-transition-metal compounds. A magnetocrystalline anisotropy of the e asy-axis type is assumed and the cases of ferromagnetic and ferrimagne tic coupling of the two sublattices are considered. The theoretical re sults are compared to neutron-scattering data obtained from RFe2, R2Fe 17, R2Co17, and R2Fe14B, with R representing different rare-earth atom s.