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|Type:||Artigo de periódico|
|Title:||MAGNETIC-PROPERTIES AND GIANT MAGNETORESISTANCE IN MAGNETIC GRANULAR COXCU100-X ALLOYS|
|Abstract:||Magnetic granular CoxCu100-x alloys (x = 5-20) have been prepared by melt-spinning acid subsequently annealing at 450 degrees C for 30 min, which is most appropriate for obtaining the largest MR change with magnetic field in each sample. The highest magnetoresistance (MR) change of 42.5% was observed in annealed Co15CU85 ribbons. Based on the superparamagnetic assumption, the average size of Co particles embedded in a Cu-rich matrix for different samples, ranging from 3.5 to 5.5 nm, has been estimated by simulating the magnetization curves at room temperature which is higher than the blocking temperature T-B for each sample. The value of MR change was found to strongly depend on the Co composition and annealing temperature.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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