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Carbon-Doped Boron Nitride Nanosheets with Ferromagnetism above Room Temperature

机译：室温下具有铁磁性的碳掺杂氮化硼纳米片

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摘要

The possibility to induce magnetism in light-element materials that contain only s and p electrons is of fundamental and practical importance. Here, weak high-temperature ferromagnetism is observed in carbon-doped boron nitride (B-C-N) nanosheets. The bulk-quantities of B-C-N nanosheets that are free of metallic impurities are prepared through a multi-step process. These B-C-N samples exhibit ferromagnetic hysteresis stable at room temperature and above, with saturation magnetization and coercivity comparable to the previously reported results of defective graphite samples. The ferromagnetic response disappears upon the removal of carbon dopants from the BN lattice, indicating that the observed magnetism originates from substitutional carbon-doping rather than from extrinsic magnetic impurities. On the basis of first-principle calculations it is shown that not only substitutional carbon doping in a honeycomb BN lattice favors spontaneous spin polarization and local moment formation, but also that the spin moments can exhibit long-range magnetic ordering.
机译：在仅包含s和p电子的轻元素材料中感应磁性的可能性具有根本和实际的重要性。在这里，在碳掺杂的氮化硼（B-C-N）纳米片中观察到弱的高温铁磁性。通过多步法制备不含金属杂质的B-C-N纳米片的大批量。这些B-C-N样品在室温及更高温度下表现出稳定的铁磁滞后，其饱和磁化强度和矫顽力可与以前报道的有缺陷石墨样品的结果相媲美。从BN晶格中除去碳掺杂剂后，铁磁响应消失，这表明观察到的磁性来自替代性碳掺杂，而不是非本征磁性杂质。根据第一性原理计算，结果表明，蜂窝BN晶格中的取代碳掺杂不仅有利于自发自旋极化和局部矩的形成，而且自旋矩可以表现出远距离的磁有序性。

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  • 来源
    《Advanced Functional Materials》 |2014年第38期|5985-5992|共8页
  • 作者

    Chong Zhao; Zhi Xu; Hao Wang; Jiake Wei; Wenlong Wang; Xuedong Bai; Enge Wang;

  • 作者单位

    International Center for Quantum Materials School of Physics, Peking University Beijing 100871, P. R. China,Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190, P. R. China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190, P. R. China;

    International Center for Quantum Materials School of Physics, Peking University Beijing 100871, P. R. China,Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190, P. R. China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190, P. R. China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190, P. R. China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190, P. R. China;

    International Center for Quantum Materials School of Physics, Peking University Beijing 100871, P. R. China;

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