期刊
SCIENCE ADVANCES
卷 4, 期 2, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aar2250
关键词
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资金
- JSPS Fellowship [P17066, 17F17066]
- PRESTO-JST Innovative nano-electronics through interdisciplinary collaboration among material, device and system layers [13415036, JPMJPR1325, JPMJPR1323]
- Mizuho Foundation for the Promotion of Sciences
- Japan Society for the Promotion of Science (JSPS) KAKENHI [26103004, 26220604]
- JSPS
- Spintronics Research Network of Japan (Spin-RNJ)
- Grants-in-Aid for Scientific Research [17F17066, 26220604, 26103004] Funding Source: KAKEN
- Austrian Science Fund (FWF) [P17066] Funding Source: Austrian Science Fund (FWF)
Current-induced magnetization switching through spin-orbit torques is the fundamental building block of spin-orbitronics, which promises high-performance, low-power memory and logic devices. The spin-orbit torques generally arise from spin-orbit coupling of heavy metals. However, even in a heterostructure where a metallic magnet is sandwiched by two different insulators, a nonzero spin-orbit torque is expected because of the broken inversion symmetry; an electrical insulator can be a source of the spin-orbit torques. We demonstrate current-induced magnetization switching using an insulator. We show that oxygen incorporation into the most widely used spintronic material, Pt, turns the heavy metal into an electrically insulating generator of the spin-orbit torques, which enables the electrical switching of perpendicular magnetization in a ferrimagnet sandwiched by insulating oxides. We also show that the spin-orbit torques generated from the Pt oxide can be controlled electrically through voltage-driven oxygen migration. These findings open a route toward energy-efficient, voltage-programmable spin-orbit devices based on insulating metal oxides.
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