Volume 90, Number 6, June 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||09 July 2010|
Memory and rejuvenation in a spin glass
Department of Engineering Sciences, Uppsala University - Box 534, SE-751 21 Uppsala, Sweden, EU
Corresponding author: * email@example.com
Accepted: 9 June 2010
The temperature dependence of the magnetisation of a Cu(Mn) spin glass () 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 (40 K) 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.
PACS: 75.50.Lk – Spin glasses and other random magnets / 75.10.Nr – Spin-glass and other random models / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
© EPLA, 2010
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