Journal
APPLIED PHYSICS LETTERS
Volume 116, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5131665
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Funding
- 4-VA, a collaborative partnership for advancing the Commonwealth of Virginia
- ICTAS Junior Faculty Award
- Virginia Tech Economical and Sustainable Materials Destination Area
- Virginia Tech Graduate School Doctoral Assistantship
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How spin-orbit torques emerge from materials with weak spin-orbit coupling (e.g., light metals) is an open question in spintronics. Here, we report on a field-like spin-orbit torque (i.e., in-plane spin-orbit field transverse to the current axis) in SiO2-sandwiched Permalloy (Py), with the top Py-SiO2 interface incorporating ultrathin Ti or Cu. In both SiO2/Py/Ti/SiO2 and SiO2/Py/Cu/SiO2, this spin-orbit field opposes the classical Oersted field. While the magnitude of the spin-orbit field is at least a factor of 3 greater than the Oersted field, we do not observe evidence for a significant damping-like torque in SiO2/Py/Ti/SiO2 or SiO2/Py/Cu/SiO2. Our findings point to contributions from a Rashba-Edelstein effect or spin-orbit precession at the (Ti, Cu)-inserted interface.
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