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arXiv · 2304.04121

Integral Absorption of Microwave Power by Random-Anisotropy Magnets

E. M. Chudnovsky·D. A. Garanin
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Abstract

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 $D^2_R/J$ 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 $(J/D_R)^{1/2}$ lattice spacings.

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E. M. Chudnovsky, D. A. Garanin. 2023-04-08. Integral Absorption of Microwave Power by Random-Anisotropy Magnets. https://doi.org/10.1103/physrevb.107.224413

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