GMR and Kondo Effects in Cu-Co Microwires.

We studied the effect of annealing on magneto-transport, magnetic, and structural properties of CuCo ( x = 5, 10, 20) glass-coated microwires prepared using the Taylor-Ulitovsky technique. Both as-prepared and annealed samples exhibit magnetoresistance effect. We observed a Kondo-like effect in as-prepared and annealed CuCo microwire and a significant increase of the giant magnetoresistance (GMR) in all studied Co-Cu after annealing. The origin of GMR effect and Kondo-like behavior is discussed considering structural changes of the annealed samples. [ABSTRACT FROM AUTHOR]