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4 October 2024 Spin-charge conversion in NiFe/Bi2Se3 heterostructures observed by terahertz emission spectroscopy
Jon Gustafson, Mehmet Noyan, Connie Li, Olaf van't Erve
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Proceedings Volume PC13119, Spintronics XVII; PC131190X (2024) https://doi.org/10.1117/12.3027716
Event: Nanoscience + Engineering, 2024, San Diego, California, United States
Abstract
In a topological insulator (TI), spin-charge conversion (SCC) is expected to occur at the surface through the spin-momentum locking of the metallic surface states. MBE-grown TIs however are oftentimes unintentionally doped resulting in bulk states that can convert spin to charge through the inverse spin hall effect. In this work, we investigate the SCC mechanisms of the TI Bi2Se3 using time-resolved THz emission spectroscopy. Here, we demonstrate THz emission in NiFe/Bi2Se3 heterostructures using bulk-insulating Bi2Se3 and bulk-conducting Bi2Se3. We also present results comparing NiFe/Bi2Se3 to W/NiFe/Pt, a heavy metal spintronic THz emitter.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Jon Gustafson, Mehmet Noyan, Connie Li, and Olaf van't Erve "Spin-charge conversion in NiFe/Bi2Se3 heterostructures observed by terahertz emission spectroscopy", Proc. SPIE PC13119, Spintronics XVII, PC131190X (4 October 2024); https://doi.org/10.1117/12.3027716
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KEYWORDS
Terahertz radiation
Emission spectroscopy
Heterojunctions
Terahertz spectroscopy
Magnetism
Ultrafast phenomena
Spintronics
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