Magnetic Properties of UMn2

Abstract

The magnetic properties of U${\mathrm{Mn}}_2$ have been investigated for the temperature range from 360°K down to 4.2°K. Below room temperature the magnetization curves are slightly bent toward the field axis and below 230°K the sample showed a small remanence. The susceptibility against temperature curve shows a $\lambda$-type anomaly at 260°K and a steep increase at about 4°K. The hysteresis loops are not symmetrical with respect to the origin and the degree of asymmetry depends upon either the temperature or whether the sample was cooled in magnetic field or without field. From some evidence, U${\mathrm{Mn}}_2$ is classified as an antiferromagnetic material with a small parasitic ferromagnetism which may arise from uncompensated sublattice moments or uncompensated domain wall magnetization.