Thermal fluctuations and longitudinal relaxation of single-domain magnetic particles at elevated temperatures

Details Thermal fluctuations and longitudinal relaxation of single-domain magnetic particles at elevated temperatures Thermal fluctuations and longitudinal relaxation of single-domain magnetic particles at elevated temperatures

2004-09-14

arxiv.org/abs/cond-mat/0409344v1

Phys. Rev. B 70, 212409 (2004)

Physics

Condensed Matter

Statistical Mechanics

4 PR pages, 1 figure

Scientific paper

10.1103/PhysRevB.70.212409

We present numerical and analytical results for the swiching times of magnetic nanoparticles with uniaxial anisotropy at elevated temperatures, including the vicinity of T_c. The consideration is based in the Landau-Lifshitz-Bloch equation that includes the relaxation of the magnetization magnitude M. The resulting switching times are shorter than those following from the naive Landau-Lifshitz equation due to (i) additional barrier lowering because of the reduction of M at the barrier and (ii) critical divergence of the damping parameters.

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