Influence of annealing condition on giant magnetoresistance of FeCo–Cu granular films

Structural and magnetic properties of Al doped Co–Ag granular films: temperature dependence of magnetoresistance

“…Thermal annealing reduces the structural disorder, enlarges particle size and increases interparticle separation, leading to an increase of the electron mean free path and consequently Rð0Þ decreases. The reduction of DR is mainly due to the reduction of spin-dependent scattering as a result of enlarged particle size [8,18]. We assume that the small amount of aluminium embedded in the silver matrix or at cobalt particle surfaces can inhibit the enlargement of magnetic grains and the rapid reduction of the resistance.…”

Current Progress of Magnetoresistance Sensors

“…FeCo processes high saturation magnetization and strong spin-dependent scattering properties, which are favoured in MR materials [77][78][79]. FeCo granules/particles have been embedded in Si-N, SiO2, Al2O3, Cu, and carbon matrix by magnetron sputtering technique [77,[80][81][82][83]. In these studies, FeCo granular systems achieved the MR up to 30% at room temperature.…”

“…The first method relies on introducing disorder into the graphene layers. This method employs the monolayer or multilayer graphene [77,[80][81][82][83]. In these studies, FeCo granular systems achieved the MR up to 30% at room temperature.…”

Formation of metastable phases and their effect on the magnetic properties of Co-Cu multilayers

“…1.8% at annealing temperature of 250 8C and 2.4% at 350 8C. Several mechanisms of GMR increase upon annealing for the multilayers and granular films have been suggested [36][37][38][39][40]. For instance, discontinuity of magnetic layers caused by Cu diffusion along magnetic grain boundaries can elevate interlayer antiferromagnetic coupling and consequently the GMR value [36,37].…”

“…Besides this discontinuous GMR behavior, a back-diffusion process upon annealing is attributed to enhance GMR effect for immiscible multilayered systems [38,39]. In FeCo-Cu granular films [40], the precipitation of magnetic phase from Cu matrix, the growth of fine grains with higher specific surface, and the relief of defects, stress and structural disorder were all thought in favor of GMR increase with increasing annealing temperature. After all, the present results are not adequate to decide the GMR type, and the work to identify the GMR origin is being carried out.…”