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  • Title: Room-temperature ferromagnetism in graphitic petal arrays.
    Author: Rout CS, Kumar A, Kumar N, Sundaresan A, Fisher TS.
    Journal: Nanoscale; 2011 Mar; 3(3):900-3. PubMed ID: 21264436.
    Abstract:
    We report room-temperature ferromagnetism of graphitic petal arrays grown on Si substrates by microwave plasma chemical vapor deposition without catalyst. The samples have been characterized by Raman and X-ray photoelectron spectroscopy to confirm the absence of possible ferromagnetic impurities. The petals exhibit ferromagnetic hysteresis with saturation magnetization of ∼4.67 emu cm(-3) and coercivity of ∼105 Oe at 300 K, comparable to the reported behavior of few-layer graphene. Upon O2 annealing the saturation magnetization and coercivity decreased to 2.1 emu cm(-3) and ∼75 Oe respectively. The origin of ferromagnetism is believed to arise from the edge defects and vacancies in the petals.
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