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

doi:10.1002/adfm.201800462

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

Department of Applied Physics and Physico-Informatics

Research output: Contribution to journal › Article

5 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 language	English
Article number	1800462
Journal	Advanced Functional Materials
Volume	28
Issue number	20
DOIs	https://doi.org/10.1002/adfm.201800462
Publication status	Published - 2018 May 16

Keywords

graphene spintronics
magnetic insulators
outermost surface spin spectroscopy
proximity effect
spin polarization

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1002/adfm.201800462

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Sakai, S., Erohin, S. V., Popov, Z. I., Haku, S., Watanabe, T., Yamada, Y., Entani, S., Li, S., Avramov, P. V., Naramoto, H., Ando, K., Sorokin, P. B., & Yamauchi, Y. (2018). Dirac Cone Spin Polarization of Graphene by Magnetic Insulator Proximity Effect Probed with Outermost Surface Spin Spectroscopy. Advanced Functional Materials, 28(20), [1800462]. https://doi.org/10.1002/adfm.201800462

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, Vol. 28, No. 20, 1800462, 16.05.2018.

Research output: Contribution to journal › Article

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, vol. 28, no. 20, 1800462. 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 ; Vol. 28, No. 20.

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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.",

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AU - Avramov, Pavel V.

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AU - Ando, Kazuya

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