Abstract
The magnetic susceptibilities of some aged Cr-Rh alloys show unusual properties when cooled from above 300°C in an applied field. An apparent ``frozen in'' moment of order 10−2 emu·g−1 appears on the result of an anisotropy which sets in at or near the temperature at which, for the same specimen cooled in zero field, a maximum in susceptibility occurs. Reverse fields up to 10 kOe are insufficient to reverse this moment. The remanent moment is also a function of aging time and disappears again when the alloy is completely precipitated. Resistivity measurements suggest that the anisotropy sets in at the Néel temperature of the matrix and the general character of the results may be interpreted as resulting from some type of exchange between the weakly ferromagnetic precipitate and the antiferromagnetic matrix.
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