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

Peng Li, Lauren J. Riddiford, Chong Bi, Jacob J. Wisser, Xiao-Qi Sun, Arturas Vailionis, Michael J. Veit, Aaron Altman, Xiang Li, Mahendra DC, Shan X. Wang, Y. Suzuki, and Satoru Emori
Phys. Rev. Materials 5, 064404 – Published 4 June 2021

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.

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  • Received 5 September 2019
  • Revised 1 August 2020
  • Accepted 10 May 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.064404

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Peng Li1,2,*, Lauren J. Riddiford1,2, Chong Bi1,3, Jacob J. Wisser1,2, Xiao-Qi Sun1,4, Arturas Vailionis5,6, Michael J. Veit1,2, Aaron Altman1,2, Xiang Li1,3, Mahendra DC1,3, Shan X. Wang1,3, Y. Suzuki1,2, and Satoru Emori7,†

  • 1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
  • 2Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 3Department of Material Science, Stanford University, Stanford, California 94305, USA
  • 4Department of Physics, Stanford University, Stanford, California 94305, USA
  • 5Stanford Nano Shared Facilities, Stanford University, Stanford, California 94305, USA
  • 6Department of Physics, Kaunas University of Technology, Studentu Street 50, LT-51368 Kaunas, Lithuania
  • 7Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA

  • *Corresponding author: Peng.Li@auburn.edu
  • Corresponding author: semori@vt.edu

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Issue

Vol. 5, Iss. 6 — June 2021

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