論文

2018年5月16日

Dirac Cone Spin Polarization of Graphene by Magnetic Insulator Proximity Effect Probed with Outermost Surface Spin Spectroscopy

Advanced Functional Materials
  • Seiji Sakai
  • ,
  • Sergei V. Erohin
  • ,
  • Zakhar I. Popov
  • ,
  • Satoshi Haku
  • ,
  • Takahiro Watanabe
  • ,
  • Yoichi Yamada
  • ,
  • Shiro Entani
  • ,
  • Songtian Li
  • ,
  • Pavel V. Avramov
  • ,
  • Hiroshi Naramoto
  • ,
  • Kazuya Ando
  • ,
  • Pavel B. Sorokin
  • ,
  • Yasushi Yamauchi

28
20
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1002/adfm.201800462
出版者・発行元
Wiley-VCH Verlag

The effects of the proximity contact with magnetic insulator on the spin-dependent electronic structure of graphene are explored for the heterostructure of single-layer graphene (SLG) and yttrium iron garnet Y3Fe5O12 (YIG) by means of outermost surface spin spectroscopy using a spin-polarized metastable He atom beam. In the SLG/YIG heterostructure, the Dirac cone electrons of graphene are found to be negatively spin polarized in parallel to the minority spins of YIG with a large polarization degree, without giving rise to significant changes in the π band structure. Theoretical calculations reveal the electrostatic interfacial interactions providing a strong physical adhesion and the indirect exchange interaction causing the spin polarization of SLG at the interface with YIG. The Hall device of the SLG/YIG heterostructure exhibits a nonlinear Hall resistance attributable to the anomalous Hall effect, implying the extrinsic spin–orbit interactions as another manifestation of the proximity effect.

リンク情報
DOI
https://doi.org/10.1002/adfm.201800462

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