Uniform and nonuniform thermal switching of magnetic particles

Garanin, D. A.

doi:10.1103/PhysRevB.98.144425

Title: Uniform and nonuniform thermal switching of magnetic particles

Journal Article · 15 October 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.98.144425 · OSTI ID:1593711

Garanin, D. A. ^[1]

City Univ. of New York (CUNY), NY (United States); Lehman College of the City University of New York

The pulse-noise method to systems of classical spins weakly interacting with the bath has been applied to study thermally activated escape of magnetic nanoparticles over the uniform and nonuniform energy barriers at intermediate and low damping. The validity of approximating a single-domain particle by a single spin is investigated. Barriers for a nonuniform escape of elongated particles for the uniaxial model with transverse and longitudinal field have been worked out. Pulse-noise computations have been done for finite magnetic chains. The linear stability of the uniform barrier state has been investigated. The crossover between uniform and nonuniform barrier states has been researched with the help of the variational approach.

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Research Organization:: City Univ. of New York (CUNY), NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-93ER45487

OSTI ID:: 1593711

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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