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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 - Bi2Se3 and (Bi,Sb)2Te3 - deposited by molecular beam epitaxy on Y3Fe5O12 thin films. By systematically varying the Bi2Se3 film thickness, we show that the spin-charge conversion efficiency, characterized by the inverse Rashba-Edelstein effect length (λIREE), 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 Y3Fe5O12/(Bi,Sb)2Te3 heterostructures. Finally, we use the ferromagnetic resonance linewidth broadening and the inverse Rashba-Edelstein signals to determine the effective interfacial spin mixing conductance and λIREE.
Original language | English (US) |
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Article number | 076601 |
Journal | Physical review letters |
Volume | 117 |
Issue number | 7 |
DOIs | |
State | Published - Aug 11 2016 |
Bibliographical note
Publisher Copyright:© 2016 American Physical Society.
How much support was provided by MRSEC?
- Shared
Reporting period for MRSEC
- Period 3
PubMed: MeSH publication types
- Journal Article
Fingerprint
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MRSEC IRG-2: Sustainable Nanocrystal Materials
Kortshagen, U. R., Aydil, E. S., Campbell, S. A., Francis, L. F., Haynes, C. L., Hogan, C., Mkhoyan, A., Shklovskii, B. I. & Wang, X.
9/1/98 → …
Project: Research project
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