title: Role of spin-flip transitions in the anomalous Hall effect of FePt alloy.
abstract: We carry out ab initio calculations which demonstrate the importance of the non-spin-conserving part of the spin-orbit interaction for the intrinsic anomalous Hall conductivity of ordered FePt alloys. The impact of this interaction is strongly reduced if Pt is replaced by the lighter isoelectronic element Pd. An analysis of the interband transitions responsible for the anomalous velocity reveals that spin-flip transitions occur not only at avoided band crossings near the Fermi level, but also between well-separated pairs of bands with similar dispersions. We also predict a strong anisotropy in the anomalous Hall conductivity of FePt caused entirely by low-frequency spin-flip transitions.
authors.affiliation: Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Zhang
authors.forename: Frank
authors.initials: F
authors.lastname: Freimuth
authors.forename: Stefan
authors.initials: S
authors.lastname: Blügel
authors.forename: Yuriy
authors.initials: Y
authors.lastname: Mokrousov
authors.forename: Ivo
authors.initials: I
authors.lastname: Souza