Low-temperature magnetic hysteresis properties of multidomain single-crystal titanomagnetite

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Scientific paper

The low-temperature magnetic hysteresis characteristics of multidomain titanomagnetite were fitted by a mixed coercivity model in which magnetocrystalline-controlled and magnetostriction-controlled domain-wall pinning play an important part. The effective contribution of the former was found to decrease systematically with increasing titanium content for compositions in the range Fe2.48Ti0.52O4-Fe2.35Ti0.65O4. In agreement with the model, the observed magnetic remanence transitions and the characteristic peaks on the susceptibility vs. temperature curve became less pronounced as the titanium content increased. The problems in using these features as a means of identifying the carriers of natural remanent magnetization are discussed.
Present address: Warren Spring Laboratory, Gunnels Wood Road, Stevenage, Herts., U.K.

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