Magnetic relaxation of a system of superparamagnetic particles weakly coupled by dipole-dipole interactions

被引:46
作者
Dejardin, Pierre-Michel [1 ]
机构
[1] Univ Perpignan, Lab Math & Phys, F-66860 Perpignan, France
关键词
THERMAL FLUCTUATIONS; DIELECTRIC-RELAXATION; ROTATIONAL DIFFUSION; SUSCEPTIBILITY; DYNAMICS; FIELD; FORCE; MODEL; TIME;
D O I
10.1063/1.3665886
中图分类号
O59 [应用物理学];
学科分类号
摘要
Long range dipole-dipole interactions in the thermal fluctuations of the magnetization of an assembly of single-domain ferromagnetic particles are considered, ignoring orientational correlations between the particles, so that the evolution of the magnetization orientations may be described by a nonlinear Fokker-Planck equation (FPE) reducing to the usual linear one in the limit of infinite dilution [W. F. Brown Jr., Phys. Rev. 130, 1677 (1963)]. The thermally activated relaxation time scale of the assembly is estimated, leading to a simple and transparent modification of the axially symmetric asymptotes for the superparamagnetic relaxation time. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3665886]
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页数:10
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