Pure Spin Currents Driven by Colossal Spin–Orbit Coupling on Two-Dimensional Surface Conducting SrTiO3
| Autor: | Mi-Jin Jin, Jung-Woo Yoo, Doo-Seung Um, Kohei Ohnishi, Jason W. A. Robinson, Daeseong Choe, Sachio Komori, N. A. Stelmashenko |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Condensed matter physics Mechanical Engineering Bioengineering General Chemistry Spin–orbit interaction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Magnetic field Ferromagnetism Precession Spin Hall effect Spin diffusion Condensed Matter::Strongly Correlated Electrons General Materials Science Anisotropy Spin-½ |
| Zdroj: | Nano Letters. 21:6511-6517 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.1c01607 |
| Popis: | Spin accumulation is generated by passing a charge current through a ferromagnetic layer and sensed by other ferromagnetic layers downstream. Pure spin currents can also be generated in which spin currents flow and are detected as a nonlocal resistance in which the charge current is diverted away from the voltage measurement point. Here, we report nonlocal spin-transport on two-dimensional surface-conducting SrTiO3 (STO) without a ferromagnetic spin-injector via the spin Hall effect (and inverse spin Hall effect). By applying magnetic fields to the Hall bars at different angles to the nonlocal spin-diffusion, we demonstrate an anisotropic spin-signal that is consistent with a Hanle precession of a pure spin current. We extract key transport parameters for surface-conducting STO, including: a spin Hall angle of γ ≈ (0.25 ± 0.05), a spin lifetime of τ ∼ 49 ps, and a spin diffusion length of λs ≈ (1.23 ± 0.7) μm at 2 K. |
| Databáze: | OpenAIRE |
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