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MA: Fachverband Magnetismus

MA 63: Spin: Transport, Orbitronics and Hall Effects III

MA 63.4: Vortrag

Freitag, 20. März 2020, 10:15–10:30, HSZ 403

Spin-orbital coupled dynamics in (Fe,Ni)/W(110) from first principles — •Dongwook Go^1,2,3, Frank Freimuth¹, Jan-Philipp Hanke¹, Stefan Blügel¹, Hyun-Woo Lee², and Yuriy Mokrousov^1,4 — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52428 Jülich, Germany — ²Department of Physics, Pohang University of Science and Technology, Pohang 37673, Korea — ³Basic Science Research Institute, Pohang University of Science and Technology, Pohang 37673, Korea — ⁴Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

A common wisdom in spintronics is that angular momentum is carried by the spin of electrons. In current-induced spin dynamics, however, we recently showed that the orbital degree of freedom plays a fundamental role, where spin dynamics follows the orbital dynamics by the spin-orbit coupling [1]. Thus, spin and orbital degrees of freedom exhibit entangled dynamics in general. In this talk, we present our recently developed formalism that consistently describes angular momentum transfer dynamics between spin and orbital degrees of freedom of electrons, and their interaction with lattice and local magnetic moment. We apply this formalism to (Fe,Ni)/W(110), and show that the orbital current injection critically affects the magnetization dynamics when the ferromagnet is Ni, which is consistent with a recently proposed orbital torque mechanism [2]. We acknowledge fundings from DFG (SPP 2137) and SSTF (BA-1501-07). [1] Go et al. Phys. Rev. Lett. 121, 086602 (2019); [2] Go et al., arXiv:1903.01085 (2019).