Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Transport: Nanoelectronics II - Spintronics and Magnetotransport
TT 37.7: Vortrag
Donnerstag, 26. März 2009, 11:00–11:15, HSZ 105
Anisotropy of the intrinsic anomalous Hall effect in FePt, FePd and FeNi ordered alloys — •Yuriy Mokrousov1,2, Eric Roman1, and Ivo Souza1 — 1University of California at Berkeley, USA — 2Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
We calculate from first principles the intrinsic anomalous Hall conductivity (AHC) of the layered L10 alloys FePt, FePd and FeNi. We find large intrinsic contributions (comparable to those of bulk Fe, Co, and Ni), in apparent disagreement with a recent experimental work (K.M. Seemann et al., arXiv:0811.1258) which attributed the anomalous Hall effect in FePd and FePt entirely to skew-scattering from impurities. We propose that a clear signature of the intrinsic effect in these materials is its strong dependence on the orientation of the magnetization with respect to the uniaxial direction, while skew-scattering is expected to be largely isotropic. The calculated anisotropy has opposite signs for FePt (where the AHC is reduced by almost a factor of two as the magnetization direction is changed from the [001] to the [110] direction) and for FePd and FeNi, where instead it increases, but by a smaller amount. By selectively turning off the spin-orbit interaction on the Fe and X atoms (X=Pt,Pd,Ni), we investigate their individual contributions to the AHC.