Abstract
Reflection electron microscopy of electrodeposited Co, Cu/(111) Pt ultrathin layers has revealed a heteroepitaxial and simultaneous multinuclear multilayer growth or a three‐dimensional island growth, which depends on the deposition overpotential. Giant magnetoresistance has been observed in heterogeneous Co‐Cu alloy films, which consist of ultrafine fcc Co‐rich clusters in a nonmagnetic polycrystalline Cu matrix, prepared by electrodeposition under potential control. Such a heterogeneous alloy exhibits a large saturation magnetoresistance of more than 20% at room temperature.
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