Origin of inverse Rashba-Edelstein effect at Cu/Bi interface using lateral spin valves

Abstract

The spin transport and spin-to-charge current conversion properties of bismuth are investigated using permalloy/copper/bismuth (Py/Cu/Bi)lateral spin valve structures. The spin current is strongly absorbed at the surface of Bi, leading to ultra-short spin diffusion lengths. A spin-to-charge current conversion is measured, which is attributed to the inverse Rashba-Edelstein effect at the Cu/Bi interface. The spin-current-induced charge current is found to change direction with increasing temperature. A theoretical analysis relates this behavior to the complex spin structure and dispersion of the surface states at the Fermi energy. The understanding of this phenomenon opens novel possibilities to exploit spin-orbit coupling to create, manipulate, and detect spin currents in 2D systems.

10 pages, 4 figures for the main text + 6 pages, 6 figures for the supplementary information

References in corpus (8)

• Direct electronic measurement of the spin Hall effect
• Strong spin-orbit splitting on Bi surfaces
• Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces
• Inverse Edelstein Effect
• Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt
• Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths
• Control of spin injection by direct current in lateral spin valves
• Contribution of defects to the spin relaxation in copper nanowires

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