Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.23: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Spin-orbit torques in FePt/Pt films from first principles — •Guillaume Géranton, Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Spin-orbit torques in ordered FePt/Pt thin films are investigated from Kubo linear response theory based on the first-principles electronic structure obtained within density functional theory (DFT). FePt/Pt thin films are identified as good candidates for spintronics applications for two reasons: First, large magnetocrystalline anisotropy values were reported in FePt. This suggests that the spin-orbit interaction is strong in this alloy. Thus, breaking of structural inversion symmetry in FePt/Pt films gives rise to relatively large spin-orbit torques (SOTs) on the magnetization. Second, FePt films grow pseudomorphically on Pt(001) substrate. The atomistic structure of FePt/Pt films can thus be well controlled and a high level of reproducibility is possible with respect to magnetic properties. In order to understand the mechanisms underlying the SOTs in FePt/Pt films, we compute the atom-resolved torkance and atom-resolved spin current flux for both even and odd parts of the torkance.