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Experimental evidence suggests that the magnetization of α-Fe 2 O 3 consists of a soft spin-canted moment and a hard defect moment. The former is observed in the range -20° to 675°C; the latter is maintained across the transitions that bound the temperature range of the detectable spin-canted moment and is lost at the true Neel point of α-Fe 2 O 3 of 725°C. Both memory and the highest coercivity fraction of remanence in α-Fe 2 O 3 are due to the defect moment.
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Smith et al. (1967) studied this question.
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