Coercivity of a macroscopic ferrimagnet near a compensation point

A ferrimagnet that does not have the opposing magnetic components in a unit cell of atomic dimensions is termed a macroscopic ferrimagnet. It is shown that the temperature dependence of the coercive field of such a magnet seems very different from that of a homogeneous ferrimagnet in that it decreases as T approaches the compensation temperature. This is understood to be the result of a weak magnetic coupling at the interface between the opposing components. This leads to an enhanced high-field susceptibility near the compensation temperature, which eventually controls the apparent coercive field. These suggestions are born out by a simple molecular field calculation.<
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