Coercive field of a polycrystalline ferrimagnet with uni-axial anisotropy

Unlike the coercive field H c of a bulk ferrimagnet, which diverges at the compensation temperature T comp , the coercive field of a polycrystalline ferrimagnet with uni-axial anisotropy is shown to have a minimum at T comp . Despite this behavior, the field required for domain-wall motion still diverges at the compensation temperature. These ideas are used to treat a ferrimagnetic class of molecule-based magnets, the bimetallic oxalates, that exhibit a minimum coercivity at T comp .