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The influence of Fezt ions on the coercivity and induced magnetic anisotropy of acicular cobalt-ferrite particles was studied. When the Coz+ content was constant, the coercivity and induced magnetic anisotropy linearly increased with increasing FSt content of the acicular cobalt-ferrite particles. The activation energy E of these samples was measured and found to be about 0.4 eV. A model of Cop+ and Fe2+ pairs oriented along the magnetic field direction to induce a uniaxial magnetic anisotropy after magnetic annealing is proposed to explain the experimental results.

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