Integral Absorption of Microwave Power by Random-Anisotropy Magnets

We study analytically and numerically on lattices containing ${10}^5$ spins, the integral absorption of microwaves by a random-anisotropy magnet, $\int d\omega P(\omega )$. It scales as $D_R^2\mathrm{/}J$ on the random-anisotropy strength $D_R$ and the strength of the ferromagnetic exchange $J$ in low-anisotropy amorphous magnetic materials. At high anisotropy and in low-anisotropy materials sintered of sufficiently large ferromagnetic grains, the integral power scales linearly on $D_R$. The maximum bandwidth, combined with the maximum absorption power, is achieved when the amorphous structure factor, or grain size, is of an order of the domain wall thickness in a conventional ferromagnet that is of the order of $(J\mathrm{/}{D}_R{)}^{1\mathrm{/}2}$ lattice spacings.