Sign determination of spin polarization in L2 1-ordered Co 2FeSi using a Pt-based spin Hall device

S. Oki, K. Masaki, N. Hashimoto, S. Yamada, M. Miyata, M. Miyao, Takashi Kimura, K. Hamaya

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So far, we have demonstrated markedly high spin polarizations (∼0.8) in one of the L2 1-ordered Heusler compounds, Co 2FeSi (CFS), by detecting pure spin currents using nonlocal spin-valve measurements. Here, we experimentally determine the sign of the spin polarization in the L2 1-ordered CFS using the electrical spin Hall effect (SHE) measurements in a lateral device with Pt. Inverse SHE signals with a positive-sign hysteresis loop are clearly detected at 20 K. Since the spin Hall conductivity of Pt is the positive sign, the pure spin current generated by the CFS electrode with L2 1-ordered structures has positive spin polarization. The SHE measurement is a powerful tool to determine the sign of the spin polarization in unknown spin injectors.

Original languageEnglish
Article number174412
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - Nov 14 2012


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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