Strong paramagnetism and possible ferromagnetism in pure carbon nanofoam produced by laser ablation
AuthorRode, A. V.
Gamaly, E. G.
Christy, A. G.
Gerald, J. G. Fitz
Hyde, S. T.
Elliman, R. G.
Veinger, A. I.
SourceJournal of Magnetism and Magnetic Materials
Volume290-291 PART 1
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We report the production of a hierarchically nanostructured magnetic carbon foam by high-repetition-rate laser ablation of glassy carbon in Ar. The clusters contain both sp2 and sp3 bonded carbon atoms. The material contains graphite-like sheets with hyperbolic curvature, as proposed for "schwarzite". In addition to other unusual properties, the all-carbon nanofoam exhibits para- and maybe ferromagnetic behavior up to 90 K, with a narrow hysteresis curve, susceptibility of the order of 10-5 emu/g Oe, and a high saturation magnetization (up to 0.8 emu/g at 1.8 K). We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized for >1 year due to the steric protection offered by the convoluted sheets. © 2004 Elsevier B.V. All rights reserved.
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