Clear variation of spin splitting by changing electron distribution at non-magnetic metal/Bi2O3 interfaces

Abstract

Large spin splitting at Rashba interface, giving rise to strong spin-momentum locking, is essential for efficient spin-to-charge conversion. Recently, a Cu/Bismuth oxide (Bi2O3) interface has been found to exhibit an efficient spin-to-charge conversion similar to a Ag/Bi interface with large Rashba spin splitting. However, the guiding principle of designing the metal/oxide interface for the efficient conversion has not been clarified yet. Here we report strong non-magnetic (NM) material dependence of spin splitting at NM/Bi2O3 interfaces. We employed spin pumping technique to inject spin current into the interface and evaluated the magnitude of interfacial spin-to-charge conversion. We observed large modulation and sign change in conversion coefficient which corresponds to the variation of spin splitting. Our experimental results together with first-principles calculations indicate that such large variation is caused by material dependent electron distribution near the interface. The results suggest that control of interfacial electron distribution by tuning the difference in work function across the interface may be an effective way to tune the magnitude and sign of spin-to-charge conversion and Rashba parameter at interface.

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• Large spin-to-charge conversion at the two-dimensional interface of transition metal dichalcogenides and permalloy
• Spin and charge interconversion in Dirac semimetal thin films
• Spin absorption at ferromagnetic-metal/platinum-oxide interface
• Phenomenological model for the direct and inverse Edelstein effects
• Photoinduced Rashba spin to charge conversion via interfacial unoccupied state
• Enhancement of acoustic spin pumping by acoustic distributed Bragg reflector cavity
• Anomalous spin-orbit field via Rashba-Edelstein effect at W/Pt interface
• Majorana-like localized spin density without bound states in topologically trivial spin-orbit coupled nanowires
• Giant spin torque efficiency in naturally oxidized polycrystalline TaAs thin films
• Unified Framework for Charge-Spin Interconversion in Spin-Orbit Materials
• Interfacial mechanism in the anomalous Hall effect of Co/Bi${}_2$O${}_3$ bilayers
• Emergence of large spin-charge interconversion at an oxidized Cu/W interface
• Spin accumulation at nonmagnetic interface induced by direct Rashba Edelstein effect
• Efficient Edelstein effects in one-atom-layer Tl-Pb compound
• The Dirac paradox in 1+1 dimensions and its realization with spin-orbit coupled nanowires
• Evidence for spin swapping from modulation of transverse resistance in magnetic heterostructures with Rashba interface
• Current-induced spin polarization at metallic surfaces from first-principles
• Two-dimensional electron gas in a metal/amorphous oxide interface with spin orbit interaction
• Electron transport in quantum channels with spin-orbit interaction: Effects of the sign of the Rashba coupling and applications to nanowires
• Confinement versus interface bound states in spin-orbit coupled nanowires
• Large spin-charge interconversion induced by interfacial spin-orbit coupling in a highly conducting all-metallic system
• Orbital Hybridization Induces Giant Cubic Rashba Effect at Cu/WO${}_3$ Interface