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 |
|---|---|
| Journal | Advanced Functional Materials |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
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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 journal › Article
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TY - JOUR
T1 - Dirac Cone Spin Polarization of Graphene by Magnetic Insulator Proximity Effect Probed with Outermost Surface Spin Spectroscopy
AU - Sakai, Seiji
AU - Erohin, Sergei V.
AU - Popov, Zakhar I.
AU - Haku, Satoshi
AU - Watanabe, Takahiro
AU - Yamada, Yoichi
AU - Entani, Shiro
AU - Li, Songtian
AU - Avramov, Pavel V.
AU - Naramoto, Hiroshi
AU - Ando, Kazuya
AU - Sorokin, Pavel B.
AU - Yamauchi, Yasushi
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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.
KW - Graphene spintronics
KW - Magnetic insulators
KW - Outermost surface spin spectroscopy
KW - Proximity effect
KW - Spin polarization
UR - http://www.scopus.com/inward/record.url?scp=85044861525&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85044861525&partnerID=8YFLogxK
U2 - 10.1002/adfm.201800462
DO - 10.1002/adfm.201800462
M3 - Article
AN - SCOPUS:85044861525
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
ER -