Limits on intrinsic magnetism in graphene

M. Sepioni; R. R. Nair; S. Rablen; J. Narayanan; F. Tuna; R. Winpenny; A. K. Geim; I. V. Grigorieva

doi:10.1103/PhysRevLett.105.207205

Limits on intrinsic magnetism in graphene

M. Sepioni, R. R. Nair, S. Rablen, J. Narayanan, F. Tuna, R. Winpenny, A. K. Geim, I. V. Grigorieva

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Abstract

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. © 2010 The American Physical Society.

Original language	English
Article number	207205
Journal	Physical Review Letters
Volume	105
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.105.207205
Publication status	Published - 12 Nov 2010

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AU - Nair, R. R.

AU - Rablen, S.

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AU - Tuna, F.

AU - Winpenny, R.

AU - Geim, A. K.

AU - Grigorieva, I. V.

PY - 2010/11/12

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N2 - 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. © 2010 The American Physical Society.

AB - 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. © 2010 The American Physical Society.

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Limits on intrinsic magnetism in graphene

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