Memory and rejuvenation in a spin glass

Abstract

The temperature dependence of the magnetisation of a Cu(Mn) spin glass ($T_g$ $\approx$ 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 (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.

EPL style; 7 pages, 5 figures

References in corpus (4)

• Experimental probing of the interplay between ferromagnetism and localisation in (Ga,Mn)As
• Nonequilibrium spin glass dynamics from picoseconds to 0.1 seconds
• Ab initio study of atomic ordering and spin-glass transition in dilute CuMn alloys
• Logarithmic growth law in the two-dimensional Ising spin glass state resulting from the electron doping in single-layered manganites

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