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

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