Quantifying spin relaxation in mesoscopic Cu channels via a multitude of nonlocal spin valves

Yunjiao Cai, Chuan Qin, Fatih Kandaz, Xingyu Shen, Chao Zhou, Mengwen Jia, Yongming Luo, Yizheng Wu, and Yi Ji
Phys. Rev. B 100, 144419 – Published 14 October 2019

Abstract

We fabricate a large number (>100) of nonlocal spin valves with mesoscopic Cu channels. A systematic method is used to extract Cu resistivity ρCu and spin relaxation length λCu from each given structure. A relationship between λCu and ρCu is established over a broad range of ρCu (from 0.7 to >10μΩcm) with >200 data points obtained at 10 and 295 K. Quantitative analysis of the relationship indicates that the spin relaxation can be described by the Elliott-Yafet model with a low spin-flip probability of (1.9±0.2)×104 for bulk scattering and a higher probability of (1.6±0.2)×103 for surface scattering. Encouraging large values of λCu (2.0μm at 10 K and 700nm at 295 K) are achieved experimentally in structures with low ρCu values (1.0μΩcm at 10 K and 4.0μΩcm at 295 K).

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  • Received 17 April 2019
  • Revised 27 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.144419

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yunjiao Cai1, Chuan Qin1,*, Fatih Kandaz1,†, Xingyu Shen1, Chao Zhou2, Mengwen Jia2, Yongming Luo2,3, Yizheng Wu2, and Yi Ji1,‡

  • 1Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
  • 2Department of Physics, State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, People's Republic of China
  • 3Center for Integrated Spintronic Devices, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, People's Republic of China

  • *Present address: Western Digital Corporation, 44100, Osgood Road, Fremont, California 94539, USA.
  • Present address: Department of Physics, Gebze Technical University, Gebze 41400, Turkey.
  • yji@udel.edu

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Vol. 100, Iss. 14 — 1 October 2019

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