GMR effect and Kondo-like behaviour in Co-Cu microwires

The influence of annealing on structure and temperature and magnetic field dependences of resistance of Cu100-xCox (x = 5, 10, 20) glass-coated microwires prepared using Taylor-Ulitovsky has been studied. All Cu100-xCox microwires present resistivity minimum at certain temperature, T-m. This minimum is very well defined for as-cast samples. T-m-values decrease after annealing (from about 50 K to about 25 K). Observed R(T) dependences and the minimum are well affected by applied magnetic field. Additionally we observed a significant increasing of the GMR effect in the annealed samples (at 400 degrees C) with long enough annealing time (up to 34% GMR effect). Considerable enhancement of the GMR effect related with structural changes of the studied samples is promising for technical applications. (C) 2016 Elsevier B.V. All rights reserved.