Memory and rejuvenation in a spin glass
2010 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 90, no 6, 67003- p.Article in journal (Refereed) Published
The temperature dependence of the magnetisation of a Cu(Mn) spin glass (T-g approximate to 57 K) has been investigated using weak probing magnetic fields (H = 0.5 or 0 Oe) and specific thermal protocols. The behaviour of the zero-field-cooled, thermoremanent and isothermal remanent magnetisation on (re-) cooling the system from a temperature (40K) where the system has been aged is investigated. It is observed that the measured magnetisation is formed by two parts: i) a temperature- and observation time-dependent thermally activated relaxational part governed by the age- and temperature-dependent response function and the (latest) field change made at a lower temperature, superposed on ii) a weakly temperature-dependent frozen-in part. Interestingly we observe that the spin configuration that is imprinted during an elongated halt in the cooling, if it is accompanied by a field-induced magnetisation, also includes a unidirectional excess magnetisation that is recovered on returning to the ageing temperature.
Place, publisher, year, edition, pages
2010. Vol. 90, no 6, 67003- p.
Physical Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-134165DOI: 10.1209/0295-5075/90/67003ISI: 000282852900022OAI: oai:DiVA.org:uu-134165DiVA: diva2:371882