Magnetic Ordering and Spin-glass Behaviour of Carbon Nanoclusters

Date

2006

Authors

Rode, Andrei V
Madsen, Nathan
Christy, Andrew
Luther-Davies, Barry
Arcon, D
Zorko, A
Jaglicic, Z
Lau, Desmond W M
McCulloch, Dougal G

Journal Title

Journal ISSN

Volume Title

Publisher

Institute of Electrical and Electronics Engineers (IEEE Inc)

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.

Description

Keywords

Keywords: Ablation; Antiferromagnetic materials; Antiferromagnetism; Carbon; Ferromagnetic materials; Ferromagnetism; Glass; Graphite; Laser ablation; Magnetic materials; Magnetic properties; Magnetic susceptibility; Nanoclusters; Nanoscience; Nanostructured materi Ferromagnetic carbon; Magnetic carbon nanoclusters; Spin glass

Citation

Source

Proceedings of the 2006 International Conference on Nanoscience and Nanotechnology

Type

Conference paper

Book Title

Entity type

Access Statement

License Rights

DOI

10.1109/ICONN.2006.340542

Restricted until

2037-12-31