Proximity-Induced Spin Polarization of Graphene in Contact with Half-Metallic Manganite

Seiji Sakai*, Sayani Majumdar, Zakhar I. Popov, Pavel V. Avramov, Shiro Entani, Yuri Hasegawa, Yoichi Yamada, Hannu Huhtinen, Hiroshi Naramoto, Pavel B. Sorokin, Yasushi Yamauchi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

The role of proximity contact with magnetic oxides is of particular interest from the expectations of the induced spin polarization and weak interactions at the graphene/magnetic oxide interfaces, which would allow us to achieve efficient spin-polarized injection in graphene-based spintronic devices. A combined approach of topmost-surface-sensitive spectroscopy utilizing spin-polarized metastable He atoms and ab initio calculations provides us direct evidence for the magnetic proximity effect in the junctions of single-layer graphene and half-metallic manganite La0.7Sr0.3MnO3 (LSMO). It is successfully demonstrated that in the graphene/LSMO junctions a sizable spin polarization is induced at the Fermi level of graphene in parallel to the spin polarization direction of LSMO without giving rise to a significant modification in the π band structure.

Original languageEnglish
Pages (from-to)7532-7541
Number of pages10
JournalACS Nano
Volume10
Issue number8
DOIs
Publication statusPublished - 23 Aug 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • graphene
  • half-metals
  • interface
  • magnetic oxides
  • proximity effect
  • spin polarization
  • spintronics

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