Magnetic and magnetotransport properties of granular Cu85Fe15 prepared by mechanical alloying

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Abstract
The magnetic and magnetotransport properties of granular Cu85Fe15 prepared by mechanical alloying have been investigated. The sample was prepared by grinding fine powders of copper and iron in a high energy ball mill. Zero field cooled and field cooled susceptibilities showed a behavior that is typical of a superparamagnet. The blocking temperature TB of 20 K was determined from ac susceptibility. The magnetoresistance reached 5.5% at 4.5 K in a field of 5 T. It was increased to 7.6% after the sample was annealed at 300 °C for 20 min. The hysteresis loop was measured for both magnetization and magnetoresistance. There was a clear correlation between the two. The magnetoresistance is due to the scattering associated with iron nanoparticles present in the samples and its dependence on particle size is discussed.