Static and Microwave Properties of Amorphous Magnets Near Saturation

Abstract

Static and dynamic properties of magnetically soft amorphous ferromagnets have been studied analytically and numerically within random-field and random-anisotropy models. 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. On increasing the strength of randomness, the localization length goes down in accordance with theoretical expectations, while the damping of spin excitations goes up.

10 PR pages, 6 figure captions

References in corpus (8)

• New approach to designing functional materials for stealth technology: Radar experiment with bilayer absorbers and optimization of the reflection loss
• Experimental and Numerical Understanding of Localized Spin Wave Mode Behavior in Broadly Tunable Spatially Complex Magnetic Configurations
• Structure Factor of the 3D Random Field XY Model
• Nonlinear and Thermal Effects in the Absorption of Microwaves by Random Magnets
• Random Anisotropy Magnet at Finite Temperature
• Integral Absorption of Microwave Power by Random-Anisotropy Magnets
• Localized Spin-Wave Modes and Microwave Absorption in Random-Anisotropy Ferromagnets
• Scaling of Static and Dynamical Properties of Random Anisotropy Magnets