Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.3: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Magnetocrystalline anisotropy in the X-ray magnetic linear dichroism (XMLD) at the L2,3-edges of cubic 3d ferromagnets — •Peter M. Oppeneer1 and Jan Kunes1,2 — 1IFW Dresden — 2ASCR Prague
We present an ab initio investigation of the x-ray magnetic linear dichroism (XMLD) in cubic (001) and (111) Fe, Co and Ni. We demonstrate that the XMLD spectra can be understood in terms of a simple model based on the energy derivatives of the 3d partial densities of states and the exchange splitting of the core levels, while the valence-band spin-orbit interaction plays only a marginal role for the overall shape of the spectra. Furthermore our calculations predict the existence of a huge magneto-crystalline anisotropy in the XMLD spectra, which is of the same size as the XMLD spectrum itself. The magnetocrystalline anisotropy is much larger than what has previously been observed for XMCD spectra. We provide a qualitative explanation of the anisotropy in terms of the above-mentioned model and suggest its experimental use for obtaining more information about the unoccupied eg and t2g densities of states individually.