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Influence of the SmCo5 hard magnetic phase on the magnetoresistive properties of Cu–Fe ribbons

The SmCo5 hard magnetic phase was added to magnetoresistive granular Cu–Fe alloys in order to investigate the influence of the presence of a hard magnetic phase on the magnetoresistive properties of a granular alloy that contains a soft magnetic phase. Cu80(Sm0.17Co0.83)xFe20−x ribbons, with x = 20,15,10,5, obtained by melt spinning, were investigated. The ribbons are composed of magnetic Fe, SmCo5, and Co precipitates embedded in a Cu matrix. In the as-quenched state, the magnetic interactions between magnetic precipitates lead to the formation of magnetic coherent regions and the magnetoresistance effect is only observed at high field (>1 T). After annealing, the strength of interactions decreases and a magnetoresistance effect is observed at low field (<1 T). The largest magnetoresistance effect (16%) is observed at 5 K for the Cu80(Sm0.17Co0.83)10Fe10 alloy annealed at 450 °C.