The 44.7Cu-20.6Mn-34.7A1 (at. %) alloy aged at 300 °C for 1 h, which exhibits the high coercive force of 5–6 kOe at 300 K, has been found to show displaced hysteresis loop when it is cooled to 77 K in a magnetic field. The displaced hysteresis loop is believed to be due to the statistical fluctuations in the local Mn concentration and the coexistence of ferromagnetic and antiferromagnetic interactions between Mn atoms of different separation.
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Narita et al. (1980) studied this question.
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