Room-temperature ferromagnetism in graphitic petal arrays |
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Authors: | Rout Chandra Sekhar Kumar Anurag Kumar Nitesh Sundaresan A Fisher Timothy S |
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Affiliation: | Birck Nanotechnology Center and School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA. |
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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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