Thermal stability of coupled ferromagnetic and superparamagnetic particles

Details Thermal stability of coupled ferromagnetic and superparamagnetic particles Thermal stability of coupled ferromagnetic and superparamagnetic particles

2002-12-03

arxiv.org/abs/cond-mat/0212041v1

Physics

Condensed Matter

Materials Science

3 pages, 2 figures, presented at MMM'02

Scientific paper

10.1063/1.1555853

We consider a single-domain ferromagnetic particle with uniaxial anisotropy coupled to a single-domain soft ferromagnetic particle (superparamagnetic particle). The problem of thermally agitated magnetization reversal in this case can be reduced to the random magnetization dynamics of the first particle with an effectively larger anisotropy field. The magnetic external field is also altered in a manner that depends on the sign of the coupling and can be either enhanced or suppressed.

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