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Estimation of the spin polarization for Heusler-compound thin films by means of nonlocal spin-valve measurements: Comparison of Co2FeSi and Fe3Si

K. Hamaya, N. Hashimoto, S. Oki, S. Yamada, M. Miyao, and T. Kimura
Phys. Rev. B 85, 100404(R) – Published 13 March 2012

Abstract

We study room-temperature generation and detection of pure spin currents using lateral spin-valve devices with electrodes formed from the Heusler compounds Co2FeSi (CFS) or Fe3Si (FS). The magnitude of the nonlocal spin-valve signals is strongly affected by resistivity variations observed particularly in low-temperature-grown Heusler compounds containing ordered structures. From an analysis based on a one-dimensional spin diffusion model, we find that the spin polarization monotonically increases with decreasing resistivity, which depends on the structural ordering, for both the CFS and FS electrodes, and show that CFS has a larger spin polarization than FS.

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  • Received 29 September 2011

DOI:https://doi.org/10.1103/PhysRevB.85.100404

©2012 American Physical Society

Authors & Affiliations

K. Hamaya1,2,*, N. Hashimoto1, S. Oki1, S. Yamada1, M. Miyao1,3, and T. Kimura3,4,†

  • 1Department of Electronics, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
  • 2Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, Sanbancho, Tokyo 102-0075, Japan
  • 3Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Sanbancho, Tokyo 102-0075, Japan
  • 4INAMORI Frontier Research Center, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan

  • *hamaya@ed.kyushu-u.ac.jp
  • kimura@ifrc.kyushu-u.ac.jp

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Issue

Vol. 85, Iss. 10 — 1 March 2012

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