Positive magnetisation in carbon nanostructures

Rode, A. V., Christy, A. G., Madsen, N. R., Gamaly, E. G., Hyde, S. T. and Luther-Davies, B. (2006) Positive magnetisation in carbon nanostructures. Current Applied Physics, 6 3: 549-552. doi:10.1016/j.cap.2005.11.058


Author Rode, A. V.
Christy, A. G.
Madsen, N. R.
Gamaly, E. G.
Hyde, S. T.
Luther-Davies, B.
Title Positive magnetisation in carbon nanostructures
Journal name Current Applied Physics   Check publisher's open access policy
ISSN 1567-1739
Publication date 2006-06-01
Sub-type Article (original research)
DOI 10.1016/j.cap.2005.11.058
Open Access Status Not yet assessed
Volume 6
Issue 3
Start page 549
End page 552
Total pages 4
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Carbon nanoclusters produced by high-repetition-rate laser ablation of glassy carbon in Ar exhibits para- and ferromagnetic behaviour up to 90 K, showing a narrow hysteresis curve with a coercive force Hc = 420 Oe, remnant magnetisation of 5 × 10-3 emu/g, susceptibility of the order of 10-5 emu/g Oe and saturation magnetization 0.3-0.8 emu/g at 1.8 K. We consider briefly the mechanism of formation of clusters in the laser-ablated vapour and structural characteristics of the nanoclusters, which show the presence of graphite-like sheets with hyperbolic curvature, as proposed for "schwarzite". 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.
Keyword Laser ablation
Nanocluster formation kinetic
Nanoclusters
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth and Environmental Sciences
 
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