Abstract

The magnetocrystalline anisotropy of magnetite with varying metal to oxygen ratio was investigated. Homogeneous single-crystal specimens of Fe 3(1−δ)O 4 with 0 ⩽ δ < 0.0093 were prepared. The magnetization curves were measured along the principal crystal axes both above and below the Verwey transition. Anisotropy constants were determined by comparing calculated magnetization curves with experimental data. The magnetocrystalline anisotropy energy for the low temperature phase of magnetite was found to vanish at the δ value where the Verwey transition disappears.

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