Damping dependence of the reversal time of the magnetization of single-domain ferromagnetic particles for the Neel-Brown model: Langevin dynamics simulations versus analytic results
Citation:
Yuri P. Kalmykov, William T. Coffey, Unai Atxitia, Oksana Chubykalo-Fesenko, Pierre-Michel Dejardin, and Roy W. Chantrell, Damping dependence of the reversal time of the magnetization of single-domain ferromagnetic particles for the Neel-Brown model: Langevin dynamics simulations versus analytic results, PHYSICAL REVIEW B, 82, 024412, 2010, 6Download Item:
Damping dependence of the reversal time of the magnetization of single-domain ferromagnetic particles for the Neel-Brown model- Langevin dynamics simulations versus analytic results.pdf (Published (publisher's copy) - Peer Reviewed) 151.9Kb
Abstract:
The damping dependence of the thermally activated reversal time of the magnetization of noninteracting uniaxial single-domain ferromagnetic particles is determined using Langevin dynamics simulations and the analytic Neel-Brown theory with the latter given both in the form of the exact matrix-continued fraction solution of the governing Fokker-Planck equation and its accompanying asymptotes for the escape rate. The reversal time from Langevin dynamics simulations is extremely sensitive to the initial and switching conditions used. Thus if the latter are chosen inappropriately the simulation result may markedly disagree with the analytic one particularly for low damping, where the precessional effects dominate, so that complete agreement can only be obtained by correctly choosing these conditions.
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http://people.tcd.ie/wcoffeyDescription:
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Author: COFFEY, WILLIAM THOMAS
Publisher:
American Physical SocietyType of material:
Journal ArticleSeries/Report no:
PHYSICAL REVIEW B;82;
024412;
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