De Toro, J A , Andres, J P , Gonzalez, J A , Goff, J P , Barbero, A J and Riveiro, J M (2004) Improved giant magnetoresistance in nanogranular Co/Ag: The role of interparticle RKKY interactions. Physical Review B, 70 (22).
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A record 40% room temperature giant magnetoresistance has been achieved in a nanogranular Co/Ag alloy by optimizing the concentration, sputtering conditions, and cumulative short thermal treatments. Upon annealing, the giant magnetoresistance effect exhibits a local minimum at 230 degreesC before reaching its maximum at 300 degreesC. Assuming the presence of both dipolar and RKKY-like exchange interactions between the particles, these features can be accounted for by considering that the latter correlations are progressively inhibited as the matrix, a supersaturated Ag-Co solid solution, segregates the solute Co atoms. This idea is supported by the temperature dependence of the magnetization in samples submitted to different annealings, where the zero-field cooled magnetization peaks at the lowest temperature in the sample exhibiting the largest magnetoresistance effect.
This is a Submitted version This version's date is: 12/2004 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/8495a9b3-2d68-f549-d777-ae583bbc8552/5/
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