Induced Rh magnetic moments in Fe-Rh and Co-Rh alloys using x-ray magnetic circular dichroism

The induced magnetic moment of Rh atoms in CoxRh100-x alloys (x=77,49) is investigated by x-ray magnetic circular dichroism (XMCD) at the Rh M2,3 absorption edge. By comparing with the XMCD signal observed in an Fe77Rh23 alloy where the Rh magnetic moment is known, the value of the Rh magnetic moment in Co alloys can be determined (0.6μB for x=77 and 0.1μB for x=51). We find that the Rh moment is about 1/3 the Fe or Co moment for the alloys studied. Analogous measurements of XMCD from a Co71Ru29 alloy show Ru behavior very different from that of Rh, with an induced Ru moment <1/14 the Co moment. © 1995 The American Physical Society.