Rode, Andrei V.Arcon, DenisZorko, AndrejJaglicic, ZvonkoChristy, Andrew G.Madsen, Nathan R.Luther-Davies, BarryLau, Desmond W.M.McCulloch, Dougal G.2026-01-012026-01-0197816056043120272-9172ORCID:/0000-0002-2747-5036/work/161269987ORCID:/0000-0002-9869-9782/work/162207694https://hdl.handle.net/1885/733798652Carbon 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.7en200710.1557/proc-998-j03-0570349907073