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Positive magnetisation in carbon nanostructures
A.V. Rode,A.G. Christy,N.R. Madsen,E.G. Gamaly,S.T. Hyde,B. Luther-Davies 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Carbon nanoclusters produced by high-repetition-rate laser ablation of glassy carbon in Ar exhibits para- and ferromagnetic behav-iour up to 90 K, showing a narrow hysteresis curve with a coercive forceHc = 420 Oe, remnant magnetisation of 5· 10. 3 emu/g, sus-ceptibility of the order of 10. 5 emu/g Oe and saturation magnetization 0.30.8 emu/g at 1.8 K. We consider briey the mechanism offormation of clusters in the laser-ablated vapour and structural characteristics of the nanoclusters, which show the presence of graph-ite-like sheets with hyperbolic curvature, as proposed for ‘‘schwarzite’’. We postulate that localized unpaired spins occur because of topo-oered by the convoluted sheets.