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

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
JournalAdvanced Functional Materials
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Spin polarization
Graphite
Yttrium
Graphene
yttrium-iron garnet
Garnets
Cones
cones
graphene
insulators
Spectroscopy
Iron
polarization
spectroscopy
Heterojunctions
Hall resistance
metastable atoms
Exchange interactions
Hall effect
minorities

Keywords

  • Graphene spintronics
  • Magnetic insulators
  • Outermost surface spin spectroscopy
  • Proximity effect
  • Spin polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

Cite this

Dirac Cone Spin Polarization of Graphene by Magnetic Insulator Proximity Effect Probed with Outermost Surface Spin Spectroscopy. / Sakai, Seiji; Erohin, Sergei V.; Popov, Zakhar I.; Haku, Satoshi; Watanabe, Takahiro; Yamada, Yoichi; Entani, Shiro; Li, Songtian; Avramov, Pavel V.; Naramoto, Hiroshi; Ando, Kazuya; Sorokin, Pavel B.; Yamauchi, Yasushi.

In: Advanced Functional Materials, 01.01.2018.

Research output: Contribution to journalArticle

Sakai, S, Erohin, SV, Popov, ZI, Haku, S, Watanabe, T, Yamada, Y, Entani, S, Li, S, Avramov, PV, Naramoto, H, Ando, K, Sorokin, PB & Yamauchi, Y 2018, 'Dirac Cone Spin Polarization of Graphene by Magnetic Insulator Proximity Effect Probed with Outermost Surface Spin Spectroscopy', Advanced Functional Materials. https://doi.org/10.1002/adfm.201800462
Sakai, Seiji ; Erohin, Sergei V. ; Popov, Zakhar I. ; Haku, Satoshi ; Watanabe, Takahiro ; Yamada, Yoichi ; Entani, Shiro ; Li, Songtian ; Avramov, Pavel V. ; Naramoto, Hiroshi ; Ando, Kazuya ; Sorokin, Pavel B. ; Yamauchi, Yasushi. / Dirac Cone Spin Polarization of Graphene by Magnetic Insulator Proximity Effect Probed with Outermost Surface Spin Spectroscopy. In: Advanced Functional Materials. 2018.
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