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P. Li*, L. J. Riddiford, C. Bi, S. Emori*, et al. Charge-spin interconversion in epitaxial Pt probed by spin-orbit torques in a magnetic insulator
Release time:2022-07-12
Hits:
- DOI number:
- 10.1103/PhysRevMaterials.5.064404
- Journal:
- PHYSICAL REVIEW MATERIALS
- Abstract:
- We measure spin-orbit torques (SOTs) in a model system of all-epitaxial ferrite/Pt bilayers to gain insights into charge-spin interconversion in Pt. With negligible electronic conduction in the insulating ferrite, the crystalline Pt film acts as the sole source of charge-to-spin conversion. A small fieldlike SOT independent of Pt thickness suggests a weak Rashba-Edelstein effect at the ferrite/Pt interface. By contrast, we observe a sizable dampinglike SOT that depends on the Pt thickness, from which we deduce the dominance of an extrinsic spin-Hall effect (skew scattering) and Dyakonov-Perel spin relaxation in the crystalline Pt film. Furthermore, our results point to a large internal spin-Hall ratio of ≈ 0.8 in epitaxial Pt. Our experimental work takes an essential step towards understanding the mechanisms of charge-spin interconversion and SOTs in Pt-based heterostructures, which are crucial for power-efficient spintronic devices.
- Document Code:
- 064404
- Discipline:
- Engineering
- Volume:
- 5
- Translation or Not:
- no
- Date of Publication:
- 2021-06-04