Integral relaxation time of single-domain ferromagnetic particles

D. A. Garanin
Phys. Rev. E 54, 3250 – Published 1 October 1996
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Abstract

The integral relaxation time τint of thermoactivating noninteracting single-domain ferromagnetic particles is calculated analytically in the geometry with a magnetic field H applied parallel to the easy axis. It is shown that the drastic deviation of τint1 from the lowest eigenvalue of the Fokker-Planck equation Λ1 at low temperatures, starting from some critical value of H, is the consequence of the depletion of the upper potential well. In these conditions the integral relaxation time consists of two competing contributions corresponding to the overbarrier and intrawell relaxation processes. © 1996 The American Physical Society.

  • Received 23 April 1996

DOI:https://doi.org/10.1103/PhysRevE.54.3250

©1996 American Physical Society

Authors & Affiliations

D. A. Garanin

  • I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, D-20355 Hamburg, Germany

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Vol. 54, Iss. 4 — October 1996

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