Room Temperature Giant Charge-to-Spin Conversion at SrTiO3/LaAlO3 Oxide Interface

Abstract

Two-dimensional electron gas (2DEG) formed at the interface between SrTiO3 (STO) and LaAlO3 (LAO) insulating layer is supposed to possess strong Rashba spin-orbit coupling. To date, the inverse Edelstein effect (i.e. spin-to-charge conversion) in the 2DEG layer is reported. However, the direct effect of charge-to-spin conversion, an essential ingredient for spintronic devices in a current induced spin-orbit torque scheme, has not been demonstrated yet. Here we show, for the first time, a highly efficient spin generation with the efficiency of ~6.3 in the STO/LAO/CoFeB structure at room temperature by using spin torque ferromagnetic resonance. In addition, we suggest that the spin transmission through the LAO layer at high temperature range is attributed to the inelastic tunneling via localized states in the LAO band gap. Our findings may lead to potential applications in the oxide insulator based spintronic devices.

arXiv comment16 pages, 4 figures

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• Strain Engineering of the Intrinsic Spin Hall Conductivity in a SrTiO${}_3$ Quantum Well
• Switching of biaxial synthetic antiferromagnets: a micromagentic study
• Theoretical analysis of the inverse Edelstein effect at the LaAlO${}_3$ / SrTiO${}_3$ interface with an effective tight-binding model: Important role of the second $d_{xy}$ subband
• Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin orbit couplings
• Observation of charge-to-spin conversion with giant efficiency at Ni${}_{0.8}$Fe${}_{0.2}$/Bi${}_2$WO${}_6$ interface
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