Surface-State-Dominated Spin-Charge Current Conversion in Topological-Insulator-Ferromagnetic-Insulator Heterostructures.
Hailong Wang,James Kally,Joon Sue Lee,Tao Liu,Houchen Chang,Danielle Reifsnyder Hickey,K. Andre Mkhoyan,Mingzhong Wu,A. Richardella,Nitin Samarth +9 more
TL;DR: It is shown that the spin-charge conversion efficiency, characterized by the inverse Rashba-Edelstein effect length (λ_{IREE}), increases dramatically as the film thickness is increased from two quintuple layers, saturating above six quint triple layers, suggesting a dominant role of surface states in spin and charge interconversion in topological-insulator-ferromagnet heterostructures.
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Abstract: We report the observation of ferromagnetic resonance-driven spin pumping signals at room temperature in three-dimensional topological insulator thin films-Bi_{2}Se_{3} and (Bi,Sb)_{2}Te_{3}-deposited by molecular beam epitaxy on Y_{3}Fe_{5}O_{12} thin films. By systematically varying the Bi_{2}Se_{3} film thickness, we show that the spin-charge conversion efficiency, characterized by the inverse Rashba-Edelstein effect length (λ_{IREE}), increases dramatically as the film thickness is increased from two quintuple layers, saturating above six quintuple layers. This suggests a dominant role of surface states in spin and charge interconversion in topological-insulator-ferromagnet heterostructures. Our conclusion is further corroborated by studying a series of Y_{3}Fe_{5}O_{12}/(Bi,Sb)_{2}Te_{3} heterostructures. Finally, we use the ferromagnetic resonance linewidth broadening and the inverse Rashba-Edelstein signals to determine the effective interfacial spin mixing conductance and λ_{IREE}.
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Citations
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
Aurelien Manchon,J. Železný,Ioan Mihai Miron,Tomas Jungwirth,Jairo Sinova,André Thiaville,Kevin Garello,Pietro Gambardella +7 more
TL;DR: In this paper, the authors acknowledge support from the EU FET Open RIA Grant No 766566, the Ministry of Education of the Czech Republic Grant No LM2015087 and LNSM-LNSpin.
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Room-Temperature Spin-Orbit Torque Switching Induced by a Topological Insulator.
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