Abstract
Relaxation and temperature cycles of thermoremanent magnetization, MTRM,in the superspin-glass phase of [Co80Fe20(0.9 nm)/Al2O3(3nm)]10 have been investigated. The relaxation of MTRMexhibits ageing phenomena. In negative temperature cycles for temperature stepslarger than 1 K the magnetic state is retrieved (memory effect) on returning tothe measurement temperature. This property is independent of the application ofa field step during intermediate cooling. In positive temperature cycles therelaxation is suppressed after temporary heating. The observations arediscussed in the light of both the droplet and the hierarchical picture.
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