HoFe - Garnet soft XMCD measurements below and above the compensation temperature

We have investigated the magnetism of Holmium-Iron-Garnet (Ho3Fe5O12) at th e Ho M-4,M-5 - the Fe L-2,L-3 - and the O K - edges. As expected switching of the sub-lattice magnetization is observed at the compensation temperatur e. We will give detailed analysis of the Ho and Fe XMCD signals, using sum rules. Fe dichroism is analyzed in terms of 3d ground state moments and com pared to Gadolinium-Iron-Garnet (Gd3Fe5O12). Contributions of octahedral an d tetrahedral Fe sites could be separated and analyzed quantitatively. At t he oxygen K edge two different structures are observable. Those structures show different temperature dependencies. Therefore we address these feature s separately to Fe and Rare Earth contributions.