Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-10-08
Physics
Condensed Matter
Statistical Mechanics
18 pages, 6 Encapsulated PostScript figures, uses REVTex4 style
Scientific paper
10.1103/PhysRevB.66.214406
The micromagnetic Fokker-Planck equation is solved for a uniaxial particle in the low-temperature limit. Asymptotic series in the parameter that is the inverse barrier height-to-temperature ratio are derived. With the aid of these series, the expressions for the superparamagnetic relaxation time and the odd-order dynamic susceptibilities are presented. The obtained formulas are both quite compact and practically exact in the low (with respect to FMR) frequency range that is proved by comparison with the numerically-exact solution of the micromagnetic equation. The susceptibilities formulas contain angular dependencies that allow to consider textured as well as randomly oriented particle assemblies. Our results advance the previous two-level model for nonlinear superparamagnetic relaxation.
Raikher Yuriy L.
Stepanov Victor I.
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