Integral absorption of microwave power by random-anisotropy magnets

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