The permanent magnet alloy Alcomax has been investigated after different heat treatments using two techniques. Curves of saturation intensity against temperature have been obtained using a Sucksmith balance, and curves of coercivity against temperature by extraction from a solenoid. It is concluded that maxima in the coercivity curves are associated with subsidiary Curie points. Reversible changes in room temperature coercivity produced between 600°C and 700°C are also associated with the appearance and disappearance of subsidiary Curie points.
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Clegg et al. (1957) studied this question.
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