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.

Magnetic properties and giant magnetoresistance in magnetic granular Cox Cu100-x alloys / R. H., Yu; X. X., Zhang; J., Tejada; M., Knobel; P., Tiberto; Allia, PAOLO MARIA EUGENIO ICILIO. - In: JOURNAL OF PHYSICS D. APPLIED PHYSICS. - ISSN 0022-3727. - 28:9(1995), pp. 1770-1777. [10.1088/0022-3727/28/9/003]

Magnetic properties and giant magnetoresistance in magnetic granular Cox Cu100-x alloys

ALLIA, PAOLO MARIA EUGENIO ICILIO
1995

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2498112
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