Spin-half paramagnetism in graphene induced by point defects

Details Spin-half paramagnetism in graphene induced by point defects Spin-half paramagnetism in graphene induced by point defects

2011-11-16

arxiv.org/abs/1111.3775v2

Nature Physics (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 14 figures

Scientific paper

10.1038/nphys2183

Using magnetization measurements, we show that point defects in graphene - fluorine adatoms and irradiation defects (vacancies) - carry magnetic moments with spin 1/2. Both types of defects lead to notable paramagnetism but no magnetic ordering could be detected down to liquid helium temperatures. The induced paramagnetism dominates graphene's low-temperature magnetic properties despite the fact that maximum response we could achieve was limited to one moment per approximately 1000 carbon atoms. This limitation is explained by clustering of adatoms and, for the case of vacancies, by losing graphene's structural stability.

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