Abstract

We study the dynamical properties of small antiferromagnetic particles. The Fokker-Planck equation is derived which describes the Brownian motion of the magnetic sublattices. The method of moments is used to calculate the longitudinal susceptibility of the antiferromagnetic particles in the case of “easy axis” and “easy plane” anisotropy. It is shown that, as the volume of the particles decreases, the static susceptibility tends to the finite value 4M0/3HE, where M0 is the magnetization of the sublattices and HE is the exchange field. For large particles, the influence of the thermal fluctuations falls, and the static susceptibility reaches its limiting value of zero for the “easy axis” type of antiferromagnetism, and to 2M0/HE for the “easy plane” type.

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