Co低濃度Ag-Coグラニュラー薄膜の磁性と伝導 (<特集>多層膜・人工格子・グラニューラー)

概要

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Ag-Co granular thin films were prepared by co-evaporation in the low Co concentration range (0.6 to 10 at%). As-prepared sample with Co concentrations of less than 10 at% showed superparamagnetic behavior. After annealing at 300℃ for 1 hour, 45% GMR was obtained for the 10 at% sample. Cluster sizes were derived by fitting the magnetization at temperatures above blocking in the superparamagnetic region. The size ranged from 32 to 64 atoms in the as-prepared stage and increased with the length of the annealing periods. The MR ratio at 5K increased according to the increase of cluster size as the anneal proceeded, however the change in the magneto-resistance (Δρ) decreased with increasing size. It is suggested that zero field resistance may play an important role in the MR ratio.
社団法人日本磁気学会の論文
1997-04-15