Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Theory of strongly correlated systems
MA 38.12: Vortrag
Donnerstag, 15. März 2018, 12:45–13:00, H 0110
Anatomy of the magnetic anisotropy energy mediated by tight-binding Rashba electrons — Gaurav Chaudhary1, •Manuel dos Santos Dias2, Allan H. MacDonald1, and Samir Lounis2 — 1Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany
Perpendicular magnetic anisotropy (PMA) is one of many properties that can arise from the interface between a ferromagnetic layer and a heavy-metal one. The free-electron Rashba model, often used to describe the properties of such interfaces, has been shown not to support PMA [1]. We reprise the tight-binding model of Ref. [1], describing spin-orbit-coupled electrons exchange-coupled to a background ferromagnetic order. The band energy differences approach is compared with a new description based on the static uniform spin susceptibility of the electronic system, and with a proposal of Antropov based on the spin-orbit energy [2]. We investigate not only their compatibility but also what physical insights can be gained from each of them.
This work was supported by a DAAD–RISE internship and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator Grant No. 681405-DYNASORE).
[1] K.-W. Kim et al., Phys. Rev. B 94, 184402 (2016)
[2] V. Antropov et al., Solid State Commun. 194, 35–38 (2014)