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The 44.7Cu-20.6Mn-34.7A1 (at%) alloy in the composition range between the Heusler phase and the κ phase exhibits a remarkable constricted hysteresis loop and high coercive force after tempering at about 300°C. The hysteresis loops at room temperature show diplacement along the <I>H</I> axis when the samples are cooled from 350°C to room temperature in the presence of a magnetic field. The displaced hysteresis loops are similar to those reported for mictomagnetic alloys and can be attributed to exchange anisotropy. The high coercive force and the displaced and constricted hysteresis loops observed in the alloy are explained to be caused by the exchange anisotropy interactions between ferromagnetic Heusler phase domains and antiferromagnetic Mn-rich phase domains.
社団法人日本磁気学会の論文