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Interface-induced perpendicular magnetic anisotropy of Co nanoparticles on single-layer h-BN/Pt(111)

机译：单层h-BN / Pt（111）上Co纳米粒子的界面诱导垂直磁各向异性

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摘要

Ferromagnetism with perpendicular magnetic anisotropy (PMA) was observed at room temperature in cobalt nanoparticles (NPs) grown on hexagonal boron nitride (h-BN) on a Pt(111) surface. It was shown that the Co NPs have planar hexagonal shapes with a mean diameter of ~20 nm and a mean height of ~1.6nm. The depth-resolved analysis of X-ray magnetic circular dichroism at the Co L_(2,3)-edges revealed that in the ferromagnetic Co NPs, the ratio of the orbital magnetic moment to the spin magnetic moment in the out-of-plane direction becomes larger at the Co NP/h-BN interface than the ratio in bulk Co. The B and N K-edge near edge X-ray absorption fine structures showed the orbital hybridization between the π orbitals of h-BN and d orbitals of Co at the interface, as an origin of the orbital magnetic moment enhancement possibly giving rise to PMA in the Co NPs.
机译：在室温下，在Pt（111）表面六方氮化硼（h-BN）上生长的钴纳米颗粒（NPs）中观察到具有垂直磁各向异性（PMA）的铁磁性。结果表明，钴纳米颗粒具有平面六边形形状，平均直径约为20纳米，平均高度约为1.6纳米。在Co L_（2,3）边缘对X射线磁性圆二色性的深度解析分析表明，在铁磁Co NP中，平面外轨道磁矩与自旋磁矩之比方向在Co NP / h-BN界面处比在整体Co中的比率大。B和N K边缘近边缘X射线吸收精细结构显示h-BN的π轨道与d的d轨道之间的轨道杂化在界面处的Co，作为轨道磁矩增强的起源，可能会在Co NP中引起PMA。

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  • 来源
    《Applied Physics Letters》 |2018年第2期|022407.1-022407.5|共5页
  • 作者

    Takahiro Watanabe; Yoichi Yamada; Akihiro Koide; Shiro Entani; Songtian Li; Zakhar I. Popov; Pavel B. Sorokin; Hiroshi Naramoto; Masahiro Sasaki; Kenta Amemiya; Seiji Sakai;

  • 作者单位

    Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan,Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan,QST Future Laboratory, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan;

    Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan,QST Future Laboratory, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan;

    Department of Materials Molecular Science, Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji-cho, Okazaki, Aichi 444-8585, Japan;

    Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan,QST Future Laboratory, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan,National University of Science and Technology MISiS, 4 Leninskiy prospekt, Moscow 119049, Russia;

    Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan,QST Future Laboratory, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan;

    National University of Science and Technology MISiS, 4 Leninskiy prospekt, Moscow 119049, Russia;

    QST Future Laboratory, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan,National University of Science and Technology MISiS, 4 Leninskiy prospekt, Moscow 119049, Russia,Technological Institute for Superhard and Novel Carbon Materials, 7a Centralnaya Street, Troitsk, Moscow 108840, Russia;

    Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan;

    Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan,QST Future Laboratory, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan;

    Photon Factory, High Energy Accelerator Research Organization KEK, Institute of Materials Structure Science, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;

    Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan,Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan,QST Future Laboratory, National Institutes for Quantum and Radiological Science and Technology QST, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan;

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