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. Furthermore, 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.
Li, Peng, et al. "Charge-spin interconversion in epitaxial Pt probed by spin-orbit torques in a magnetic insulator." Physical Review Materials, vol. 5, no. 6, Jun. 2021. https://doi.org/10.1103/physrevmaterials.5.064404
Li, Peng, Riddiford, Lauren J., Bi, Chong, et al., "Charge-spin interconversion in epitaxial Pt probed by spin-orbit torques in a magnetic insulator," Physical Review Materials 5, no. 6 (2021), https://doi.org/10.1103/physrevmaterials.5.064404
@article{osti_1786304,
author = {Li, Peng and Riddiford, Lauren J. and Bi, Chong and Wisser, Jacob J. and Sun, Xiao-Qi and Vailionis, Arturas and Veit, Michael J. and Altman, Aaron and Li, Xiang and DC, Mahendra and others},
title = {Charge-spin interconversion in epitaxial Pt probed by spin-orbit torques in a magnetic insulator},
annote = {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. Furthermore, 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.},
doi = {10.1103/physrevmaterials.5.064404},
url = {https://www.osti.gov/biblio/1786304},
journal = {Physical Review Materials},
issn = {ISSN 2475-9953},
number = {6},
volume = {5},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2021},
month = {06}}
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 369, Issue 1948https://doi.org/10.1098/rsta.2010.0336