期刊
FRONTIERS IN PHYSICS
卷 9, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fphy.2021.791736
关键词
spin Hall effect; spin torque ferromagnetic resonance; harmonics; epitaxial; platinum
资金
- Quantum Materials for Energy Efficient Neuromorphic Computing, an Energy Frontier Research Center (QMEEN-C EFRC) - United States DOE, Office of Science [DESC0019273]
- National Science Foundation [ECCS-1542148]
This study reports on the observation of spin Hall effect in epitaxial Pt films with well-defined crystalline orientations and smooth surfaces. Spin-torque ferromagnetic resonance measurements show a 54% enhancement in the charge-to-spin conversion efficiency of epitaxial Pt when currents are applied along the in-plane direction. Temperature-dependent harmonic measurements reveal the extrinsic mechanism underlying spin Hall effect in epitaxial Pt.
We report on the spin Hall effect in epitaxial Pt films with well-defined crystalline (200), (220), and (111) orientations and smooth surfaces. The magnitude of the spin Hall effect has been determined by spin-torque ferromagnetic resonance measurements on epitaxial Pt/Py heterostructures. We observed a 54% enhancement of the charge-to-spin conversion efficiency of the epitaxial Pt when currents are applied along the in-plane < 002 > direction. Temperature-dependent harmonic measurements on epitaxial Pt/Co/Ni heterostructures compared to a polycrystalline Pt/Co/Ni suggest the extrinsic mechanism underlying spin Hall effect in epitaxial Pt. Our work contributes to the development of energy-efficient spintronic devices by engineering the crystalline anisotropy of non-magnetic metals.
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