Nonlinear response of superparamagnets with finite damping: an analytical approach

Details Nonlinear response of superparamagnets with finite damping: an analytical approach Nonlinear response of superparamagnets with finite damping: an analytical approach

2004-04-19

arxiv.org/abs/cond-mat/0404445v1

Phys. Rev. B 70, 064415 (2004)

Physics

Condensed Matter

Statistical Mechanics

7 PR pages, 2 figures

Scientific paper

10.1103/PhysRevB.70.064415

The strongly damping-dependent nonlinear dynamical response of classical superparamagnets is investigated by means of an analytical approach. Using rigorous balance equations for the spin occupation numbers a simple approximate expression is derived for the nonlinear susceptibility. The results are in good agreement with those obtained from the exact (continued-fraction) solution of the Fokker-Planck equation. The formula obtained could be of assistance in the modelling of the experimental data and the determination of the damping coefficient in superparamagnets.

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