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Scaling of Static and Dynamical Properties of Random Anisotropy Magnets
Dmitry A. Garanin, Eugene M. Chudnovsky
Recently observed scaling in the random-anisotropy model of amorphous or sintered ferromagnets is derived by an alternative method and extended for studying the dynamical propertie…
Scaling Theory of Magnetic Order and Microwave Absorption in Amorphous and Granular Ferromagnets
Eugene M. Chudnovsky, Dmitry A. Garanin
Magnetic order and microwave absorption in amorphous ferromagnets and materials sintered from nanoscale ferromagnetic grains are investigated analytically and numerically within th…
Localized Spin-Wave Modes and Microwave Absorption in Random-Anisotropy Ferromagnets
D. A. Garanin, E. M. Chudnovsky
The theory of localized spin-wave excitations in random-anisotropy magnets has been developed. Starting with a pure Heisenberg ferromagnet, we study the evolution of standing spin…
Topological order generated by random field in a 2D exchange model
E. M. Chudnovsky, D. A. Garanin
We study a 2D exchange model with a weak static random field on lattices containing over one hundred million spins. Ferromagnetic correlations persist on the Imry-Ma scale inversel…
Random Field XY Model in Three Dimensions
D. A. Garanin, E. M. Chudnovsky, T. Proctor
We study random-field xy spin model at T=0 numerically on lattices of up to 1000 x 1000 x 1000 spins with the accent on the weak random field. Our numerical method is physically eq…