Ferromagnetism and antiferromagnetism in disordered Ni-Mn alloys

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Abstract
The magnetic properties of disordered Ni-Mn alloys between 2 °K and 300 °K are found to be extremely sensitive to composition (in the vicinity of Ni3Mn). From hysteresis loops and magnetization vs. temperature curves for fields up to 8 000 Oe, it is deduced that with increasing Mn concentration the alloy becomes less ferromagnetic and more antiferromagnetic in its low temperature behavior. Magnetization measurements for pulsed fields up to 100,000 Oe are consistent with the coexistence of ferromagnetism and antiferromagnetism in these alloys. This interpretation is further supported by the discovery that the hysteresis loop for the 26.5 % Mn specimen cooled to 4.2 °K in a magnetic field is shifted from its symmetrical position about the origin

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