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The permanent magnetic properties of Fe-34–67.5 at%Pt alloys have been investigated. It is found that the magnetic properties of an Fe-38.5 at%Pt alloy quenched from the disorder phase γ (fcc) region and subsequently aged at 773 K (500°C) for 360 ks (100 h) in the ordered phase γ1 (fct, L10-type) region, are Br=1.08 T (10.8 kG), Hc=340 kA·m−1 (4.3 kOe) and (BH)max=159 kJ·m−3 (20 MG·Oe).X-ray analysis and microstructural observations indicate that the magnetic hardening is due to the ordering stage from the γ phase to the γ1 phase having a high crystal magnetic anisotropy.
Watanabe et al. (1983) studied this question.