TY - JOUR
T1 - Giant Charge-to-Spin Conversion Efficiency in SrTi O3 -Based Electron Gas Interface
AU - Yang, Huaiwen
AU - Zhang, Boyu
AU - Zhang, Xueying
AU - Yan, Xi
AU - Cai, Wenlong
AU - Zhao, Yinglin
AU - Sun, Jirong
AU - Wang, Kang L.
AU - Zhu, Dapeng
AU - Zhao, Weisheng
N1 - Funding Information:
The authors gratefully acknowledge the National Natural Science Foundation of China (Grants No. 61627813 and No. 61571023), the International Collaboration Project Grant No. B16001, the National Key Technology Program of China Grant No. 2017ZX01032101, the Postdoctoral Science Foundation of China (Grant No. 2017M610739), and the VR innovation platform from Qingdao Science and Technology Commission for their financial support of this work.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/9/4
Y1 - 2019/9/4
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85072607069
UR - https://www.scopus.com/pages/publications/85072607069#tab=citedBy
U2 - 10.1103/PhysRevApplied.12.034004
DO - 10.1103/PhysRevApplied.12.034004
M3 - Article
AN - SCOPUS:85072607069
SN - 2331-7019
VL - 12
JO - Physical Review Applied
JF - Physical Review Applied
IS - 3
M1 - 034004
ER -