Abstract
A process for producing a dispersion of nanometer-sized, Co-rich particles embedded in a thin film of Cu-rich matrix is presented. Thin films were prepared by thermal evaporation of a bulk CoCu alloys on an amorphous C substrate. In situ transmission electron microscopy (TEM) and field-emission gun TEM equipped with an energy dispersive x-ray spectrometer were used to investigate spinodal decomposition of the initial homogeneous thin film alloy. The maximum giant magnetoresistance (GMR) is found to be 18% for a Co45Cu55 after heating the film from room temperature at 2°C∕minto204°C and holding for 10min. These nanostructures are expected to exhibit optimum GMR for granules having higher Co content.
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