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Using magnetization measurements, we show that point defects in graphene -fluorine adatoms and irradiation defects (vacancies) - carry magnetic momentswith spin 1/2. Both types of defects lead to notable paramagnetism but nomagnetic ordering could be detected down to liquid helium temperatures. Theinduced paramagnetism dominates graphene's low-temperature magnetic propertiesdespite the fact that maximum response we could achieve was limited to onemoment per approximately 1000 carbon atoms. This limitation is explained byclustering of adatoms and, for the case of vacancies, by losing graphene'sstructural stability.

Spin-half paramagnetism in graphene induced by point defects