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

  • Andrei V. Rode (a1), Denis Arcon (a2), Andrej Zorko (a2), Zvonko Jaglicic (a3), Andrew G. Christy (a1), Nathan R. Madsen (a1), Barry Luther-Davies (a1), Desmond W. M. Lau (a4) and Dougal G. McCulloch (a4)...

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.

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

  • Andrei V. Rode (a1), Denis Arcon (a2), Andrej Zorko (a2), Zvonko Jaglicic (a3), Andrew G. Christy (a1), Nathan R. Madsen (a1), Barry Luther-Davies (a1), Desmond W. M. Lau (a4) and Dougal G. McCulloch (a4)...

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