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Positive Magnetisation in Carbon Nanoclusters Produced by High-Repetition-Rate Laser Ablation

Published online by Cambridge University Press:  21 March 2011

Andrei V. Rode ,
Denis Arcon ,
Andrej Zorko ,
Zvonko Jaglicic ,
Andrew G. Christy ,
Nathan R. Madsen ,
Barry Luther-Davies ,
Desmond W. M. Lau  and
Dougal G. McCulloch
Andrei V. Rode
Affiliation:
The Australian National University, Canberra, 0200, Australia
Denis Arcon
Affiliation:
Institute Jozef Stefan, Ljubljana, 1000, Slovenia
Andrej Zorko
Affiliation:
Institute Jozef Stefan, Ljubljana, 1000, Slovenia
Zvonko Jaglicic
Affiliation:
University of Ljubljana, Ljubljana, 1000, Slovenia
Andrew G. Christy
Affiliation:
The Australian National University, Canberra, 0200, Australia
Nathan R. Madsen
Affiliation:
The Australian National University, Canberra, 0200, Australia
Barry Luther-Davies
Affiliation:
The Australian National University, Canberra, 0200, Australia
Desmond W. M. Lau
Affiliation:
RMIT University, Melbourne, 3000, Australia
Dougal G. McCulloch
Affiliation:
RMIT University, Melbourne, 3000, Australia
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Abstract

Carbon nanoclusters produced by high-repetition-rate laser ablation of graphite and glassy carbon in Ar exhibits para- and ferromagnetic behaviour at low temperature. The results show that the degree of remanent order is strongly dependent on the magnetic history, i.e. whether the samples were cooled under zero-field or field conditions. Such behaviour is typical for a spin glass structure where the system can exist in many different roughly equivalent spin configurations. The spin-freezing temperature is unusually high (50–300 K) compared with ≤ 15 K for typical spin glasses. The maximum in the zero-field magnetic susceptibility experiments and their field dependence indicate that there is competition between ferromagnetic and antiferromagnetic exchange pathways, accounting for the spin glass behavior and/or a low-dimensionality of the system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 998: Symposium J – Nanoscale Magnetics and Device Applications , 2007 , 998-J03-05
Copyright
Copyright © Materials Research Society 2007

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References

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