Towards intrinsic magnetism of graphene sheets with irregular zigzag edges

被引：68

作者：

Chen, Lianlian ^{[1
]}

Guo, Liwei ^{[1
]}

Li, Zhilin ^{[1
]}

Zhang, Han ^{[1
]}

Lin, Jingjing ^{[1
]}

Huang, Jiao ^{[1
]}

Jin, Shifeng ^{[1
]}

Chen, Xiaolong ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Res & Dev Ctr Funct Crystals, Beijing 100190, Peoples R China

来源：

SCIENTIFIC REPORTS | 2013年 / 3卷

基金：

美国国家科学基金会;

关键词：

FERROMAGNETISM; DIAMAGNETISM;

D O I：

10.1038/srep02599

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The magnetism of graphene has remained divergent and controversial due to absence of reliable experimental results. Here we show the intrinsic magnetism of graphene edge states revealed based on unidirectional aligned graphene sheets derived from completely carbonized SiC crystals. It is found that ferromagnetism, antiferromagnetism and diamagnetism along with a probable superconductivity exist in the graphene with irregular zigzag edges. A phase diagram is constructed to show the evolution of the magnetism. The ferromagnetic ordering curie-temperature of the fundamental magnetic order unit (FMOU) is 820 +/- 80 K. The antiferromagnetic ordering Neel temperature of the FMOUs belonging to different sublattices is about 54 +/- 2 K. The diamagnetism is similar to that of graphite and can be well described by the Kotosonov's equation. Our experimental results provide new evidences to clarify the controversial experimental phenomena observed in graphene and contribute to a deeper insight into the nature of magnetism in graphene based system.

引用

页数：6

共 30 条

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