Giant Magnetoresistance Effect of bcc-Fe(M)/Cu(M=Co,Ni) Multilayers

摘要

GMR effect of multilayers of bcc-Fe(M)(M=Co, Ni) alloy and Cu layers has been investigated. The maximum MR ratio is found at 1.1 um Fe(Co) and 1.3-1.4 um Cu layer thickness in [Fe(Co)/Cu], and at 1.6 um Fe(Ni) and 1.4 um Cu layer thickness in [Fe(Ni)/Cu]. Under the optimum annealing condition, the MR ratio increases up to 50% and 38% for Fe(Co) and Fe(Ni) systems, respectively. The origin of the increase of GMR is discussed, taking the progress of preferred orientation of Fe(Co)[100] or Fe(Ni)[100] by annealing into account.