Limits on Intrinsic Magnetism in Graphene

被引：322

作者：

Sepioni, M. ^{[1
]}

Nair, R. R. ^{[1
]}

Rablen, S. ^{[1
]}

Narayanan, J. ^{[1
]}

Tuna, F. ^{[2
]}

Winpenny, R. ^{[2
]}

Geim, A. K. ^{[1
]}

Grigorieva, I. V. ^{[1
]}

机构：

[1] Univ Manchester, Manchester Ctr Mesosci & Nanotechnol, Manchester M13 9PL, Lancs, England

[2] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

EXFOLIATION; GRAPHITE; STATE; EDGE;

D O I：

10.1103/PhysRevLett.105.207205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied magnetization of graphene nanocrystals obtained by sonic exfoliation of graphite. No ferromagnetism is detected at any temperature down to 2 K. Neither do we find strong paramagnetism expected due to the massive amount of edge defects. Rather, graphene is strongly diamagnetic, similar to graphite. Our nanocrystals exhibit only a weak paramagnetic contribution noticeable below 50 K. The measurements yield a single species of defects responsible for the paramagnetism, with approximately one magnetic moment per typical graphene crystallite.

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页数：4

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