Thermal fluctuations in the Landau-Lifshitz-Bloch model

Menarini, Marco; Lomakin, Vitaliy

doi:10.1103/physrevb.102.024428

Thermal fluctuations in the Landau-Lifshitz-Bloch model

Journal Article · Mon Jul 20 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.024428· OSTI ID:1803658

^[1]; Lomakin, Vitaliy ^[2]

Univ. of California, San Diego, La Jolla, CA (United States); OSTI
Univ. of California, San Diego, La Jolla, CA (United States)

A formulation for thermal noise in the stochastic form of the Landau-Lifshitz-Bloch equation used for modeling the magnetization dynamics at elevated temperatures is presented here. The diffusion coefficients for thermal fluctuations are obtained via the Fokker-Plank equation using the mean-field approximation of the field in defining the free energy. The presented model leads to a mean magnetization consistent with the equilibrium magnetization for small and large particles. The distribution of the magnetization magnitude is of the Maxwell-Boltzmann type. The presented model was tested by studying the equilibrium magnetization in macrospin particles at high temperatures. The model is appealing for multiscale modeling, such as modeling heat assisted magnetic recording systems and all-optical magnetization reversal.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Quantum-Materials for Energy Efficient Neuromorphic-Computing (Q-MEEN-C); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019273

OSTI ID:: 1803658

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 102; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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