Simultaneous rotational diffusion of the magnetic moment and the solid matrix of a single-domain ferromagnetic particle

A. O. Tsebers

Institute of Physics, Latvian Academy of Sciences, Salaspils-1, LV-2169, Latvia

Abstract
The Fokker-Planck equation for the simultaneous random diffusion of the magnetic moment and the solid matrix of a single-domain ferromagnetic particle is derived from the dynamic equations of such a diffusion in a viscous medium and from the fluctuating-dissipation theorem. The system of fundamental equations is then set up which takes into account internal rotations in the ferrofluid.