Charge-spin interconversion in epitaxial Pt probed by spin-orbit torques in a magnetic insulator

Li, Peng; Riddiford, Lauren J.; Bi, Chong; Wisser, Jacob J.; Sun, Xiao-Qi; Vailionis, Arturas; Veit, Michael J.; Altman, Aaron; Li, Xiang; DC, Mahendra; Wang, Shan X.; Suzuki, Y.; Emori, Satoru

doi:10.1103/physrevmaterials.5.064404

Title: Charge-spin interconversion in epitaxial Pt probed by spin-orbit torques in a magnetic insulator

Journal Article · Fri Jun 04 00:00:00 EDT 2021 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.5.064404· OSTI ID:1786304

^[1];

^[1]; Bi, Chong ^[1]; Wisser, Jacob J. ^[1]; Sun, Xiao-Qi ^[1];

^[1];

^[1]; Altman, Aaron ^[1];

^[1]; DC, Mahendra ^[1]; Wang, Shan X. ^[1]; Suzuki, Y. ^[1];

^[2]

Stanford Univ., CA (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Center for Neutrino Physics

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.

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Research Organization:: Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0008505

OSTI ID:: 1786304

Journal Information:: Physical Review Materials, Vol. 5, Issue 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Charge-spin interconversion in epitaxial Pt probed by spin-orbit torques in a magnetic insulator

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