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The relations between the order-disorder transformation and the permanent magnet properties of iron and platinum alloys have been investigated.An Fe-36 at%Pt alloy which is low in coercivity and is remarkable in the effect of heat treatments, has been investigated. The results show that the water-quenched γ single phase exhibits the typical soft magnetic properties. On aging at temperatures between about 770 and 870 K, the γ single phase is changed into a γ+γ1 phase, where the magnetization is not easily saturated for the high crystal magnetic anisotropy of the γ1 phase and the coercivity shows a low value. On aging at 903 K, the alloy of a γ1 single phase giving rise to broad diffraction lines exhibits the highest value of Hc=135 kA·m1. The ordering of the γ1 phase is advanced with the rise of aging temperature, while the coercivity rapidly falls.It is presumed that the origin of the excellent permanent magnet properties of the Fe-Pt alloy are related to the existence of the constitutionally very imperfect γ1 phase and the low ordering state, and these are caused by the pinning in the magnetic domain wall.
Kiyoshi Watanabe (Thu,) studied this question.
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