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Dirac Cone Spin Polarization of Graphene by Magnetic Insulator Proximity Effect Probed with Outermost Surface Spin Spectroscopy
Author(s) -
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
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201800462
Subject(s) - condensed matter physics , yttrium iron garnet , materials science , graphene , spin polarization , heterojunction , spin hall effect , topological insulator , electron , physics , nanotechnology , quantum mechanics
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 Y 3 Fe 5 O 12 (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.