Magnetic linear dichroism in x-ray emission spectroscopy: Yb in Yb3Fe5O12

A magnetic linear dichroism MLD effect of up to 5% has been observed in the 2p(1/2)4d x-ray emission spectrum of Yb in Yb3Fe5O12. The spectral shape i s well reproduced with an atomic multiplet calculation of the 4d to 2p deca y. It is shown that the details of the Spectral shapes are determined by th e 4d4f exchange interaction. While the integrated intensity of the MLD effe ct is zero, the magnitude of the effect is a direct measure of the 4S magne tic moment of Yb. The technique is applicable to all rare-earth and transit ion-metal systems (probing the 3d magnetic moment). With respect to x-ray-a bsorption magnetic circular dichroism it possesses the advantage that (i) h ard x rays are involved and (ii) no circular polarization is needed. Theref ore all complications related to electron detection, soft x-ray experiments , and circular polarization disappear. Potential applications include the s tudy of (buried) magnetic systems In situ, at high pressures, varying thigh ) magnetic fields, and varying temperatures.