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Room-Temperature Giant Charge-to-Spin Conversion at the SrTiO3-LaAlO3 Oxide Interface
Yi Wang1, Rajagopalan Ramaswamy1, Mallikarjuna Motapothula1
1Department of Electrical and Computer Engineering, NUSNNI, National University of Singapore , 117576 Singapore.
Nano Letters
|November 8, 2017
Summary
This study demonstrates efficient charge-to-spin conversion in SrTiO3/LaAlO3 interfaces for spintronics. We achieved high spin generation efficiency using spin torque ferromagnetic resonance at room temperature.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- The SrTiO3/LaAlO3 interface hosts a two-dimensional electron gas (2DEG) with potential for strong Rashba spin-orbit coupling.
- Previous work reported spin-to-charge conversion (inverse Edelstein effect), but charge-to-spin conversion remained unproven.
Purpose of the Study:
- To demonstrate direct charge-to-spin conversion in the STO/LAO 2DEG system.
- To investigate spin generation efficiency for spintronic applications.
Main Methods:
- Utilized spin torque ferromagnetic resonance (ST-FMR) technique.
- Investigated the SrTiO3/LaAlO3/CoFeB heterostructure.
Main Results:
- Achieved highly efficient spin generation with an efficiency of ~6.3 at room temperature.
- Proposed inelastic tunneling via localized states in the LAO band gap as the mechanism for spin transmission at high temperatures.
Conclusions:
- Successfully demonstrated efficient charge-to-spin conversion in the STO/LAO system.
- Findings pave the way for oxide insulator-based spintronic devices.
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