超高真空下纳米石墨烯磁性及调控
Magnetic Properties and Engineering of Nanographene in Ultra-High Vacuum
纳米石墨烯在磁学上的优异表现开始获得了更多的关注和研究。由于不饱和电子的存在,磁性纳米石墨烯的湿法化学法合成难度提高,借助超高真空下的表面催化,可以精确地实现将设计好的前驱体分子向磁性纳米石墨烯转变。相较于过渡金属的磁性,纳米石墨烯拥有更高的自旋波刚度、更弱的自旋-轨道耦合作用、更为精细的耦合作用、更长的自旋寿命,使其在自旋电子器件以及基础研究领域拥有很高的研究潜力。由于不饱和电子的存在,提高了湿法化学法合成出磁性纳米石墨烯的难度。近年来,借助超高真空下的表面催化,可以精确地实现将设计好的前驱体分子制备成磁性纳米石墨烯。进一步地,可以利用通过针尖操纵以及将磁性纳米石墨烯进行连接形成二聚体或者磁性链来进行磁性调控和研究。本综述结合近几年超高真空下纳米石墨烯的磁性研究,介绍了纳米石墨磁性的产生和利用超高真空扫描隧道显微技术对其结构和磁性的表征,以及在此基础上对纳米石墨烯磁性的磁序调控。
Due to the existence of unsaturated electrons, it is difficult to synthesize magnetic nanographene directly by the wet chemical method. With the help of surface catalysis in ultra-high vacuum, designed precursor molecules can be transformed into magnetic nanographene. Magnetism of carbon nanomaterials or nanographene possess high magnitudes of spin-wave stiffness, weak spin-orbit coupling, hyperfine couplings and large spin coherence lifetimes comparing with the transition metal, which hold the promise for spintronics construction and basic research. Due to the existence of unsaturated electrons, it is difficult to synthesize magnetic nanographene directly by the wet chemical method. With the help of surface catalysis in ultra-high vacuum, the synthesis of magnetic nanographene by artificial designed precursor molecules has been exploding. Except for the fabrication the magnetic nanographene, the investigation of magnetic ground state of nanographene itself and the magnetic engineering by tip-manipulation and construction of spin chains have been attracting much attentions. The atomic precise chemical and electronic structure and magnetic ground state could be identified by scanning tunneling spectroscopy and CO-decorated tip scanning tunneling microscope image. In this review, based on the recent research on nanographene, we introduce magnetic generations, structural and magnetism characterizations of nanographene as well as the magnetic order control by scanning tunneling microscopy in ultra-high vacuum.
1 Introduction
2 Magnetism of nanographene
2.1 Sublattice imbalance
2.2 Non-Kekuléstructure due to topology constraints
2.3 Non-Kekuléstructure due to size
3 Engineering of magnetic nanographene
3.1 Tip manipulation
3.2 Alternation of homo-coupling positions
4 Conclusion and outlook
nanographene / magnetism / engineering / scanning tunneling microscope
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国家自然科学基金项目(61901200)
国家高层次人才项目(132310976002)
云南省基础研究计划项目(2019FD041)
云南省基础研究计划项目(202101AV070008)
云南省基础研究计划项目(202101AW070010)
云南省基础研究计划项目(202101AU070043)
中国科学院先导计划项目(XDB30010000)
东莞创新研究团队计划项目资助
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