We report the direct observation of uniform in-plane spin accumulation at room temperature by magneto optical Kerr effect, at the interface formed between nonmagnetic metal (Cu, Ag) and oxide (Bi2O3). Recent reports show spin to charge conversion at these interfaces suggesting the presence of Rashba like spin orbit coupling (SOC). The formation of spin accumulation is the result of current induced spin polarization at our interfaces (direct Rashba–Edelstein effect), without external magnetic field or proximity to ferromagnetic materials. We observe opposite orientation of spin accumulation at Cu/Bi2O3 and Ag/Bi2O3 interfaces reflecting their opposite sign of Rashba SOC (Rashba parameter). Moreover, estimation of spin accumulation from values of Rashba parameters obtained by independent spin pumping measurements, agrees well with the difference in amplitude of our normalized Kerr signals for Cu/Bi2O3 and Ag/Bi2O3 interfaces. Uniform in-plane spin accumulation due to Rashba-Edelstein effect can be applied for spin filter devices and efficient driving force for magnetization switching.
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Direct optical observation of spin accumulation at nonmagnetic metal/oxide interface
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28 August 2017
Research Article|
August 30 2017
Direct optical observation of spin accumulation at nonmagnetic metal/oxide interface
Jorge Puebla
;
Jorge Puebla
a)
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
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Florent Auvray;
Florent Auvray
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
2
Institute for Solid State Physics, University of Tokyo
, Kashiwa, Chiba 277-8581, Japan
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Mingran Xu;
Mingran Xu
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
2
Institute for Solid State Physics, University of Tokyo
, Kashiwa, Chiba 277-8581, Japan
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Bivas Rana
;
Bivas Rana
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
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Antoine Albouy;
Antoine Albouy
3
Grenoble Phelma INP
, 3 Parvis Louis Néel, 38000 Grenoble, France
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Hanshen Tsai;
Hanshen Tsai
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
2
Institute for Solid State Physics, University of Tokyo
, Kashiwa, Chiba 277-8581, Japan
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Kouta Kondou;
Kouta Kondou
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
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Gen Tatara;
Gen Tatara
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
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Yoshichika Otani
Yoshichika Otani
b)
1
Center for Emergent Matter Science, RIKEN
, Wako, Saitama 351-0198, Japan
2
Institute for Solid State Physics, University of Tokyo
, Kashiwa, Chiba 277-8581, Japan
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Appl. Phys. Lett. 111, 092402 (2017)
Article history
Received:
June 14 2017
Accepted:
August 18 2017
Citation
Jorge Puebla, Florent Auvray, Mingran Xu, Bivas Rana, Antoine Albouy, Hanshen Tsai, Kouta Kondou, Gen Tatara, Yoshichika Otani; Direct optical observation of spin accumulation at nonmagnetic metal/oxide interface. Appl. Phys. Lett. 28 August 2017; 111 (9): 092402. https://doi.org/10.1063/1.4990113
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