Fe-Cluster Structure in Giant Magnetoresistive Fe_<14>Ag_<86> Granular Thin Film

概要

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High-resolution transmission electron microscopy and extended X-ray absorption fine structure analysis have been used for investigation of granular Fe_<14>Ag_<86> thin film prepared by sputtering and annealing. In the as-deposited state, Fe atoms are randomly distributed in the Ag matrix, yielding spin-glass aspects at low temperatures. After annealing the film at 573 K for 10 min, fine grains whose sizes are about 1 nm are formed and smaller Fe clusters are dispersed in these grains. Higher-temperature annealing leads to grain growth, interface sharpening and formation of bcc Fe clusters. These results are well correlated with the changes in the giant magnetoresistance: the interfacial spin-dependent scattering is enhanced by annealing at 573 K, while it is suppressed by annealing at higher temperatures.
社団法人応用物理学会の論文
1994-09-15