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

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• 作者：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
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：August 23, 2016
• 年：2016
• 卷：10
• 期：8
• 页码：7532-7541
• 全文大小：510K
• 年卷期：0
• ISSN：1936-086X

文摘

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 <i>ab initioi> calculations provides us direct evidence for the magnetic proximity effect in the junctions of single-layer graphene and half-metallic manganite La_0.7Sr_0.3MnO₃ (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.