Interface-induced perpendicular magnetic anisotropy of Co nanoparticles on single-layer h-BN/Pt(111)
Interface-induced perpendicular magnetic anisotropy of Co nanoparticles on single-layer h-BN/Pt(111)
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DOI：
10.1063/1.5010836
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发表时间：
2018-01
影响因子：
4
通讯作者：
Takahiro Watanabe;Y. Yamada;A. Koide;S. Entani;Songtian Li;Z. Popov;P. Sorokin;H. Naramoto;M. Sasaki;K. Amemiya;S. Sakai
中科院分区：
文献类型：
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作者：
Takahiro Watanabe;Y. Yamada;A. Koide;S. Entani;Songtian Li;Z. Popov;P. Sorokin;H. Naramoto;M. Sasaki;K. Amemiya;S. Sakai
在室温下，在Pt（111）表面的六方氮化硼（h-BN）上生长的钴纳米颗粒（NPs）具有垂直磁各向异性（PMA）的铁磁性。结果表明，Co纳米颗粒具有平均直径为1.20 nm，平均高度为1.6 nm的平面六边形形状。在Co L2，3-边缘处的X射线磁性圆二色性的深度分辨分析显示，在铁磁性Co NP中，在Co-NP/h-BN界面处，面外方向的轨道磁矩与自旋磁矩的比值比体相Co中的比值大。B和N K边近边X射线吸收精细结构表明，h-BN的π轨道之间存在轨道杂化。BN和d轨道的Co在界面上，作为一个起源的轨道磁矩增强可能会引起PMA的Co纳米颗粒。
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 ∼1.6 nm. The depth-resolved analysis of X-ray magnetic circular dichroism at the Co L2,3-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.