Magnetoresistance dependence on Co composition in discontinuous CoxFe1−x/Ag multilayers

Abstract We report on the structural evolution and magnetic behavior of Co x Fe 1 −x /Ag discontinuous multilayers with x =0, 0.3, 0.7 and 1. The structural characterization was performed using X-ray absorption spectroscopy (XAS). It is found from XAS measurements that there is a better ordered structure around Co than Fe absorbing atoms. For CoFe alloys, we conclude that Co atoms are within the core of the magnetic particles, while Fe atoms preferentially occupy the interfacial positions near Ag. The magnetoresistance increases when Co is added to Fe.