Magneto-Transport Phenomena in Nanolayered [FeCoNiB/Co/Cu/Co]·n Thin Films

Some results concerning the magneto-transport properties of the nanolayered [FeCoNiB/Co/Cu/Co] n thin films, in view of their utilization for manufacturing the small magnetic field sensors are presented. The [FeCoNiB/Co/Cu/Co] n thin films exhibit suitable values of the magnetoresistive characteristics and a good thermal stability. The magnetoresistive properties are discussed in relation with the deposition and annealing conditions and surface roughness of the substrate and the initial magnetic layer. The Cu(5nm)/[FeCoNiB(7.5nm)/Co(0.5nm)/Cu(1nm)/Co (0.5nm)/] 20 spin valve system annealed at 250 degC, exhibits a R/R value of about 5.7 %, a maximum magnetic field sensitivity in resistance value of about 0.9 % per Oersted and a good thermal stability of the electrical properties