Positive magnetisation in carbon nanostructures

A. V. Rode; A. G. Christy; N. R. Madsen; E. G. Gamaly; S. T. Hyde; B. Luther-Davies

doi:10.1016/j.cap.2005.11.058

Positive magnetisation in carbon nanostructures

A. V. Rode^*, A. G. Christy, N. R. Madsen, E. G. Gamaly, S. T. Hyde, B. Luther-Davies

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

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 H_c = 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.

Original language	English
Pages (from-to)	549-552
Number of pages	4
Journal	Current Applied Physics
Volume	6
Issue number	3
DOIs	https://doi.org/10.1016/j.cap.2005.11.058
Publication status	Published - Jun 2006

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title = "Positive magnetisation in carbon nanostructures",

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.",

keywords = "Laser ablation, Nanocluster formation kinetic, Nanoclusters",

author = "Rode, {A. V.} and Christy, {A. G.} and Madsen, {N. R.} and Gamaly, {E. G.} and Hyde, {S. T.} and B. Luther-Davies",

year = "2006",

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doi = "10.1016/j.cap.2005.11.058",

language = "English",

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T1 - Positive magnetisation in carbon nanostructures

AU - Rode, A. V.

AU - Christy, A. G.

AU - Madsen, N. R.

AU - Gamaly, E. G.

AU - Hyde, S. T.

AU - Luther-Davies, B.

PY - 2006/6

Y1 - 2006/6

N2 - 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.

AB - 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.

KW - Laser ablation

KW - Nanocluster formation kinetic

KW - Nanoclusters

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U2 - 10.1016/j.cap.2005.11.058

DO - 10.1016/j.cap.2005.11.058

M3 - Article

SN - 1567-1739

VL - 6

SP - 549

EP - 552

JO - Current Applied Physics

JF - Current Applied Physics

IS - 3

ER -

Positive magnetisation in carbon nanostructures

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