Abstract
A suite of synthetic titanomagnetites were prepared with compositions Fe 2.6−δTi 0.4Al δO 4 and Fe 2.4−δTi 0.6Al δO 4 ( 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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