Magnetic properties of monodomain aluminium-substituted titanomagnetite

Physics

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Scientific paper

A suite of synthetic titanomagnetites were prepared with compositions Fe2.6-δTi0.4AlδO4 and Fe2.4-δTi0.6AlδO4 (δ = 0, 0.1, 0.2 in both cases). Ball-milling of the synthesized samples produced material in the magnetic monodomain state as indicated by hysteresis loops and the Lowrie-Fuller test. The coercive force of the specimens depends on the Al concentration and lies in the range 1-2 kOe. The TRM induced in the samples is correspondingly ``hard''. The low-field (0-1 Oe) TRM acquisition curve is linear. The higher field TRM-H curve is not in agreement with either monodomain or two-domain theoretical models.

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