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MA: Fachverband Magnetismus

MA 46: MagneticThin Films II

MA 46.8: Vortrag

Donnerstag, 29. März 2012, 16:45–17:00, EB 202

Angular depedence of XMCD/XMLD of MnNi at Mn L2,3 and M2,3 edges — •Dominik Legut1, Jan Rusz2, and Peter Oppeneer21Nanotechnology Centre, Ostrava, Czech Republic — 2Department of Physics and Astronomy, Uppsala, Sweden

The full angular dependence of the x-ray magnetic circular/linear dichroism (XMCD/XMLD) spectra on the crystalline orientation of the magnetization was investigated for MnNi. The anisotropic XMCD and XMLD spectra were computed in the single electron picture within the framework of the DFT. The excitation stemming from core 2p levels as well as from semicore 3p levels (edges) were considered. The calculated results show different behavior between L2,3 and M2,3 edges, because of hybridization of two 3p1/2 sub-levels and four 3p3/2 sub-levels (mj levels).1 The XMLD signal is strongly dependent on the magnetization direction with respect to the crystal axes. Furthermore, the influence of lattice distortion and the exchange-correlation approximation was studied. In experiments, the samples are usually thin over-layers, often possessing lower symmetry, thus the corresponding distortion affects the spectral shape. The non-cubic symmetry of the studied structures gives rise to x-ray natural linear dichroism contributions. Their magnitude with respect to the magnetic dichroism contribution is discussed.

References:
1. S. Valencia et al.,Phys. Rev. Lett. 104, 187401 (2010).

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