Research Papers in Physics and Astronomy

 

Date of this Version

11-1-2002

Comments

Published in Journal of Physics: Condensed Matter 14 (2002), pp. 6729–6736. Copyright © 2002 Institute of Physics Publishing Ltd. Online at stacks.iop.org/JPhysCM/14/6729 Used by permission.

Abstract

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

Included in

Physics Commons

Share

COinS