Integral Relaxation Time of Single-Domain Ferromagnetic Particles

Details Integral Relaxation Time of Single-Domain Ferromagnetic Particles Integral Relaxation Time of Single-Domain Ferromagnetic Particles

1998-05-05

arxiv.org/abs/cond-mat/9805056v2

Phys. Rev. E 54 3250 (1996)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 3 figures

Scientific paper

10.1103/PhysRevE.54.3250

The integral relaxation time \tau_{int} 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 \tau_{int}^{-1} from the lowest eigenvalue of the Fokker-Planck equation \Lambda_1 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.

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