期刊
PHYSICAL REVIEW LETTERS
卷 117, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.076601
关键词
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资金
- Center for Spintronic Materials, Interfaces, and Novel Architectures (C-SPIN), center of STARnet, a Semiconductor Research Corporation (SRC) program - MARCO
- DARPA
- NSF through the UMN MRSEC program [DMR-1420013]
- NSF through the NNIN program
- [ONR- N00014-15-1-2364]
- [NSF-ECCS-1231598]
- [ARO-W911NF-14-1-0501]
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)(2)Te-3-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 (lambda(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 Y3Fe5O12/(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 lambda(IREE).
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