Large edge magnetism in oxidized few-layer black phosphorus nanomeshes
Large edge magnetism in oxidized few-layer black phosphorus nanomeshes
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DOI：
10.1007/s12274-016-1355-8
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发表时间：
2017-02
期刊：
影响因子：
9.9
通讯作者：
Y. Nakanishi;A. Ishi;C. Ohata;D. Soriano;R. Iwaki;K. Nomura;M. Hasegawa;Taketomo Nakamura;S. Katsumoto;S. Roche;J. Haruyama
中科院分区：
文献类型：
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作者：
Y. Nakanishi;A. Ishi;C. Ohata;D. Soriano;R. Iwaki;K. Nomura;M. Hasegawa;Taketomo Nakamura;S. Katsumoto;S. Roche;J. Haruyama
在二维（2D）材料中形成和控制室温磁序是一个具有挑战性的探索，以创新的磁性和自旋电子学为基础的技术的出现。到目前为止，在氢（H）封端的石墨烯纳米带（GNR）和石墨烯纳米网（GNM）中已经实验性地观察到了2D材料中的边缘磁性，但是测量的磁化强度仍然太小，以至于不能设想实际应用。在此，我们报告了大的室温边缘铁磁性（FM）的实验证据，从氧（O）终止锯齿形孔边缘的几层黑磷（P）纳米网（BPNM）。每单位面积的磁化强度值比H-端接的GNM报告的值大~100倍，而H-端接的BPNM不存在磁性。的磁化强度测量和第一原理模拟表明，这样的磁秩序的起源可能源于铁磁自旋耦合之间的边缘P与O原子，导致在边缘价带强的自旋本地化，并从均匀氧化的全孔边缘在一个大面积和层间自旋相互作用。我们的研究结果为在不使用稀有磁性元素的情况下实现高效率的2D柔性磁性和自旋电子器件铺平了道路。
The formation and control of a room-temperature magnetic order in two-dimensional (2D) materials is a challenging quest for the advent of innovative magnetic- and spintronic-based technologies. To date, edge magnetism in 2D materials has been experimentally observed in hydrogen (H)-terminated graphene nanoribbons (GNRs) and graphene nanomeshes (GNMs), but the measured magnetization remains far too small to allow envisioning practical applications. Herein, we report experimental evidences of large room-temperature edge ferromagnetism (FM) obtained from oxygen (O)-terminated zigzag pore edges of few-layer black phosphorus (P) nanomeshes (BPNMs). The magnetization values per unit area are ~100 times larger than those reported for H-terminated GNMs, while the magnetism is absent for H-terminated BPNMs. The magnetization measurements and the first-principles simulations suggest that the origin of such a magnetic order could stem from ferromagnetic spin coupling between edge P with O atoms, resulting in a strong spin localization at the edge valence band, and from uniform oxidation of full pore edges over a large area and interlayer spin interaction. Our findings pave the way for realizing high-efficiency 2D flexible magnetic and spintronic devices without the use of rare magnetic elements.