Cu/Co Nanomultilayers were prepared on n-type Si(111) substrate by double-bath method in boric acid plating solution and the technical conditions were determined. The appearance and structure of nanomultilayers were examined by SEM and XRD methods. It has been shown that the nanomultilayers had periodical and superlattice structure. The physics property measurement system was used to characterize magnetic properties of nanomultilayers. The results showed that coercivity of these nanomultilayers with different periodicities was all small. In this paper, the correlation between structure of nanomultilayers and giant magnetoresistance (GMR ) was studied. The GMR value was increased and then decreased with the increase of Co layer thickness, while changed periodically with Cu layer thickness. With stacking number N increased, the GMR value was increased firstly and then fell. The GMR value as large as 90% was found when N was increased to 60, while N reached 80, the GMR value was constant.

Key words: electrocrystallization, Cu/Co nanomultilayer, X-ray diffraction, giant magnetoresistance, hysteresis loop