https://doi.org/10.1140/epjb/s10051-024-00825-x
Regular Article - Solid State and Materials
Static and microwave properties of amorphous magnets near saturation
Physics Department, Herbert H. Lehman College and Graduate School, The City University of New York, 250 Bedford Park Boulevard West, Bronx, 10468-1589, New York, USA
Received:
28
October
2024
Accepted:
11
November
2024
Published online:
28
November
2024
Static and dynamic properties of magnetically soft amorphous ferromagnets have been studied analytically within the random-field model and numerically within the random-anisotropy model. External field and coherent anisotropy that are weak compared to their random counterparts are sufficient to bring the magnet close to saturation. The scaling of spin–spin correlations in this regime is computed, and its dependence on parameters is confirmed by Monte Carlo simulation. We show that near the ferromagnetic resonance, the spin excitations are damped and spatially localized due to randomness even close to saturation. Uniform precession is not an eigenmode of the system which causes its damping. On increasing the strength of randomness, the localization length goes down in accordance with theoretical expectations, while the damping of the uniform precession goes up.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
