Because of the configurational instability of an orbitally degenerate system, ferrimagnetic crystals containing orbitally degenerate cations should exhibit large magnetostriction. The effect of orbital degeneracy of Co2+ on magnetostriction in cobalt-iron ferrite is calculated by means of perturbation theory. A value of 1.4×103 cm−1 for trigonal crystal field splitting of Co2+ is inferred by comparing calculated results with experimental data.
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J. C. Slonczewski (1959) studied this question.
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