Abstract
Magnetization relaxation measurements show that aging occurs in a discontinuous metal-insulator multilayer (DMIM) below the spin-glass transition temperature, Furthermore, the DMIM system memorizes the structure of a quasiequilibrium state reached after an intermittent stop-and-wait protocol during cooling. These results unambiguously corroborate the collective nature of the low-temperature spin dynamics. The correlation length achieved at after a wait time of is estimated to extend to superspins, which seems to imply a crossover from three- to two-dimensional growth of the correlation length.
- Received 22 November 2002
DOI:https://doi.org/10.1103/PhysRevB.67.214422
©2003 American Physical Society