Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 23: Magnetic Shape Memory Alloys I (jointly with MM)
MA 23.2: Talk
Tuesday, March 15, 2011, 12:30–12:45, HSZ 04
Microscopic origin of magnetic anisotropy in martensitic Ni2MnGa — •Peter Klaer, Tobias Eichhorn, Gerhard Jakob, and Hans-Joachim Elmers — Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
From angle-dependent x-ray magnetic circular dichroism (XMCD) transmission measurements we have derived a simple model for the magnetic anisotropy of epitaxial Ni2MnGa(101)/MgO(001) magnetic shape memory films. The magnetic shape memory film reveals an anisotropy in the Ni dichroism intensity for magnetization parallel and perpendicular to the film plane. The integrated anisotropy is related to the anisotropy of the orbital magnetic moment in agreement with the observed out-of-plane magnetocrystalline anisotropy. The spectral variation of the x-ray absorption can be traced back to changes in the spin-projected density of states when the magnetization vector is rotated from the easy to the hard magnetic axis, thus revealing the spin-orbit coupling of specific Ni 3d states as the microscopic origin of the magnetic anisotropy.