Ageing dynamics of a superspin glass
2014 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 108, no 1, 17004- p.Article in journal (Refereed) Published
Magnetization dynamics of a model superspin glass system consisting of nearly monodispersed close-packed maghemite particles of diameter 8 nm is investigated. The observed non-equilibrium features of the dynamics are qualitatively similar to those of atomic spin glass systems. The intrinsic relaxation function, as observed in zero-field-cooled magnetization relaxation experiments, depends on the time the sample has been kept at constant temperature (ageing). Accompanying low-field experiments show that the archetypal spin glass characteristics -ageing, memory and rejuvenation- are reproduced in this dense system of dipolar-dipolar interacting superspins.
Place, publisher, year, edition, pages
2014. Vol. 108, no 1, 17004- p.
Materials Engineering Physical Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-238588DOI: 10.1209/0295-5075/108/17004ISI: 000343970300018OAI: oai:DiVA.org:uu-238588DiVA: diva2:772183