Electrodeposited multilayers, having different magnetic layer compositions, have been deposited with galvanostatic pulses onto rotating disk electrodes. Giant magnetoresistance (GMR) of 11% was observed for electrodeposited CoNiCu multilayers containing 2000 bilayers of a CoNiCu alloy and Cu spacer layer. The multilayers deposited under the same deposition conditions, or with the same layer thickness, from an electrolyte without Ni, resulted in lower values. Therefore, inspection of the cathodic and anodic partial current densities in different Ni-containing electrolytes was investigated. Factors that contributed to larger GMR values were (i) a change in the Cu deposition potential to a more cathodic region and (ii) an improvement of the magnetic sublayer corrosion resistance. (c) 2005 The Electrochemical Society.