Spin current induced by a charge current has been extensively explored to electrically manipulate magnetism and high charge-to-spin conversion efficiency is expected to enable a low power spin-orbit torque (SOT) switching mechanism. We report on experimental results that demonstrate a charge current flowing in-plane in an oxide Rashba-Edelstein two-dimensional electron gases (2DEGs) interface that can efficiently generate a spin current, and a strong SOT in an adjacent permalloy layer is observed by spin-torque ferromagnetic resonance. The charge-to-spin conversion efficiency θCS is up to a value of 0.9 for a simple Ar+-etched SrTiO3/NiFe structure, which is much larger than that of heavy meals, and the structure can be easily fabricated by magnetron sputtering. In addition, the spin-orbital coupling in the SrTiO3/LaAlO3 interface is more efficient and θCS can be increased up to 1.8 for the SrTiO3/LaAlO3/NiFe device, whereas it is only 0.6 for a SrTiO3/LaTiO3/NiFe device. These results will enable the realization of SOT devices based on SrTiO3-based 2DEGs for low power nonvolatile memory and logic.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)