Berlin 2012 – wissenschaftliches Programm
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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 Oppeneer2 — 1Nanotechnology 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).