Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Spin-dependent Transport Phenomena
MA 28.11: Vortrag
Donnerstag, 25. März 2010, 18:00–18:15, H3
Anisotropy of anomalous Hall conductivity in L10 3d-Pt alloys from first principles — •Hongbin Zhang, Stefan Blügel, and Yuriy Mokrousov — Institut für Festkörperforschung & Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany
Using first-principles calculations, we investigate the anisotropy of the intrinsic anomalous Hall conductivity (AHC) in ordered and disordered ferromagnetic bimetallic L10 3d-Pt (3d = Cr, Mn, Fe, Co and Ni) alloys. The AHC is calculated via the Wannier interpolation procedure with consequent Brillouin zone integration of the Berry curvature [1]. We find very large anisotropies of the AHC both upon rotating the magnetization away from the easy [001]-axis (axis along the stacking direction of the ordered alloys) to in-plane, as well as for some alloys upon rotating the magnetization in the plane normal to the stacking direction. To elucidate the origin of this anisotropy, we study in detail the contributions from different atoms and the role of spin-scattering transitions in the vicinity of the Fermi surface. At last, we provide a simple interpretation of obtained chemical trends of the AHC and its anisotropy based on a toy tight-binding model.
[1] X. Wang, J. R. Yates, I. Souza, D. Vanderbilt Phys. Rev. B 74, 195118 2006.