Anomalous Magnetic Moments and Transformations in the Ordered Alloy FeRh

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Abstract
Magnetization and electrical resistivity measurements on an iron‐rhodium alloy of approximate composition FeRh, having CsCl‐type structure, confirm recent x‐ray and neutron diffraction evidence for a first‐order antiferromagnetic‐ferromagnetic transition at about 350°K. From 350°K down to 77°K, an essentially constant, field‐independent susceptibility of about 1×10−4 emu/g is observed. Above 350°K, the alloy behaves like a normal ferromagnet with a Curie point of 675°K and a saturation magnetization (extrapolated to 0°K) of 130 emu/g. This σ0 value is equivalent to an average atomic moment of 1.85 μB, or to 3.85 μB per iron atom if the rhodium moment is assumed to be zero. Alternatively, if the iron moment is taken to be 2.2 μB, the rhodium moment has to be about 1.5 μB. Qualitative results are given for the effect of high magnetic fields and pressures on the first‐order transition temperature of this alloy.

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