Abstract
The microstructure in a granular Cu88Co12 alloy was investigated by means of x-ray diffraction (XRD), a field ion microscope with atom probe (AP-FIM) and a field emission gun-transmission electron microscope (FEG-TEM) with energy dispersive x-ray spectroscopy (EDS). Giant magnetoresistance (GMR) and magnetic properties were studied to clarify the relationship between the GMR, magnetic properties and microstructures. The morphology of nanometre-sized cobalt granules within the grains were directly determined utilizing AP-FIM and FEG-TEM with EDS. Most cobalt granules are spherical and some others are plate-like in shape. GMR was observed in alloys with an average granule size ranging from 1.5 to 6 nm in diameter. TEM investigations showed that larger Co-rich precipitates formed at grain boundaries. The magnetic properties of the granular alloy were interpreted using the microstructure information and the dependence of GMR on magnetization was discussed.
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