SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 12: Focus Session: Spin-Charge Interconversion (joint session MA/HL)

HL 12.1: Invited Talk

Tuesday, September 28, 2021, 13:30–14:00, H5

Spin-charge interconversion with oxide 2-dimensional electron gases — •Manuel Bibes — Unité Mixte de Physique CNRS/Thales

Oxide 2-dimensional electron gases (2DEGs) display a wide range of functionalities including Rashba spin-orbit coupling (SOC), which offers exciting opportunities for spintronics. In this talk, I will show that the 2DEG that forms at the interface of SrTiO3 (STO) with LaAlO3[1] or reactive metals such as Al[2,3] may be exploited to efficiently interconvert spin and charge currents. By applying a gate voltage, we tune the position of the Fermi level in the complex multi-orbital structure of STO, which results in a strong variation of the conversion amplitude[4]. This can be related to the band structure through ARPES experiment and tight-binding calculations. I will present results from both spin-charge conversion where spins are injected by spin pumping in a FMR cavity and detected as a transverse voltage[5], and from charge-spin conversion probed through the bilinear magnetoresistance (BMR). Using a semi-classical model, the analysis of the BMR amplitude yields a good estimate of the Rashba coefficient[6]. In a second part, I will present gate-controlled, all-electrical spin current generation and detection in planar nanodevices only based on a STO 2DEGs[7].

[1] Ohtomo et al, Nature 2004, 427, 423. [2] Rödel et al, Adv. Mater. 2016, 28, 1976. [3] Vicente-Arche et al, PR Mater. 2021, 5, 064005. [4] Lesne et al, Nat. Mater 2016, 15, 1261. [5] Vaz et al, Nat. Mater. 2019, 18, 1187. [6] Vaz et al, PR Mater. 2020, 4, 071001. [7] Trier et al, Nano Lett. 2020, 20, 395.