Determination of local magnetic moments of 5d impurities in Fe detected via spin-dependent absorption

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Abstract
The spectroscopy of spin‐dependent absorption using circularly polarized synchrotron radiation is a new method to study the magnetic structure of multicomponent systems. We demonstrate for substitutional 5d transition‐metal impurities in an iron host that from L2,3 spin‐dependent absorption signal information on the local magnetic moment, carried by the d electrons of the absorbing atom, can be deduced. The experimentally determined local magnetic moments of the 5d impurities in Fe are in good agreement with the theoretical results based on the spin‐polarized relativistic Korringa–Kohn–Rostoker–Green function method of band‐structure calculation. The presented data are−to our knowledge−the first experimental proof of the change from antiferro‐ to ferromagnetic coupling between Os and Ir, which has been predicted by the above‐mentioned calculations.