Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 92: Focus Session: Spinorbitronics - From Efficient Charge/Spin Conversion Based on Spin-Orbit Coupling to Chiral Magnetic Skyrmions II (joint session MA/TT)
TT 92.1: Invited Talk
Thursday, March 15, 2018, 15:00–15:30, H 1012
Spin orbit fields at the Fe/GaAs(001) interface — •Christian Back — Fakultät für Physik, Universität Regensburg — Physik-Department, TU München
Interfacial spin-orbit torques (SOTs) enable the manipulation of the magnetization through an in-plane charge current. Here, we study a particularly simple single crystalline interface, Fe/GaAs(001)[1], which we use to demonstrate various effects related to interfacial SOTs. We demonstrate crystalline anisotropic magneto-resistance showing C2v symmetry [2], second we show anisotropic magneto-optic response [3]. Finally, we use ferromagnetic resonance based methods to investigate interfacial SOTs and report the observation of robust SOT occuring at a single crystalline Fe/GaAs (001) interface at room temperature [4]. We find that the magnitude of the interfacial SOT, caused by the reduced symmetry at the interface, is comparably strong as in ferromagnetic metal/non-magnetic metal systems. The large spin-orbit fields at the interface also enable the spin-to-charge current conversion at the interface, known as spin-galvanic effect [4]. The results suggest that single crystalline Fe/GaAs interfaces may enable efficient electrical magnetization manipulation.
[1] M. Gmitra et al., Phys. Rev. Lett. 111, 036603 (2013) [2] T. Hupfauer et al., Nat. Commun. 6, 7374 (2015) [3] M. Buchner et al., Phys. Rev. Lett. 117, 157202 (2016) [4] L. Chen et al. Nat. Commun. 7, 13802 (2016)