Landau-Lifshitz-Bloch equation for ferrimagnets with higher-order interaction

Menarini, Marco; Lomakin, Vitaliy

doi:10.1103/physrevb.104.144303

Landau-Lifshitz-Bloch equation for ferrimagnets with higher-order interaction

Journal Article · Wed Oct 20 00:00:00 EDT 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.104.144303· OSTI ID:1979664

^[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)

In this work, we present a micromagnetic formulation for modeling the magnetization dynamics and thermal equilibrium in ferrimagnetic materials at low and elevated temperatures. The formulation is based on a mean-field approximation (MFA). In this formulation, the ferrimagnet is described micromagnetically by two coupled sublattices with corresponding interactions, including inter- and intrasublattice micromagnetic exchange as well as four-spin interactions described as an intersublattice molecular field with a cubic dependence of the magnetization. The MFA is used to derive a Landau-Lifshitz-Bloch type equation for ferrimagnetic material, including cases with a ferromagnetic-antiferromagnetic phase transitions. For validation, the results obtained via the presented model are compared with recent experimental data for phase transitions in FeRh.

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:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019273

OSTI ID:: 1979664

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Materials Science
Physics
ferrimagnets
ferromagnetism
magnetism
magnetization dynamics
mean field theory
micromagnetism
phase transitions

Landau-Lifshitz-Bloch equation for ferrimagnets with higher-order interaction

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