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The magnetocrystalline anisotropy constant K 1 of Fe 3 O 4 , Fe 2.96 Ti 0.04 O 4 and Fe 2.9 Ti 0.1 O 4 has been measured between room temperature and the Curie point using the torque method. The Fe 3+ contribution to the anisotropy in this temperature range has been calculated using the theory of Wolf (1957) and the relative sublattice magnetizations determined from Mossbauer-effect spectra. The specific Fe 2+ contribution, K 2B 1 is then found to vary with composition x and temperature T as K 1 2B (x,T)= (0.2-3.5X) * 10 -2 -(0.24+3.0x)(T c -T) 10/3 * 10 -8 cm -1 /ion.
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Fletcher et al. (1974) studied this question.
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