Correlation between giant magnetoresistence and magnetic interactions in a Co/Ag multilayed/granular system

• Main Author: Viegas, Alexandre da Cas
• Publication Date: 1997
• Other Authors: Geshev, Julian Penkov, Schelp, Luiz Fernando, Schmidt, Joao Edgar
• Format: Article
• Language: eng
• Source: Repositório Institucional da UFRGS
• Download full: http://hdl.handle.net/10183/95368
• topic: Física da matéria condensada; Magnetoresistencia : Magnetizacao : Filmes finos

Magnetizing, demagnetizing, and remanent magnetization curves for [Co (12 Å)/Ag(60 Å)]x15 multilayered/granular films thermally treated have been measured. The changes of the giant magnetoresistance and the interaction effects have been explained as a result of the structural, morphological, and magnetic evolution of the samples as a function of the thermal treatment. It has been inferred that for samples annealed at temperatures lower than 360 °C, the changes of the giant magnetoresistance come from the misalignment of the magnetic moments of the Co particles formed during annealing. A strong correlation between the giant magnetoresistance and the magnetic interaction effects has been found for samples annealed at temperatures higher than 360 °C: the giant magnetoresistance is degraded as the demagnetizing interparticle interactions are increased.