Giant magneto resistance for CuCoNi granular films prepared by electrode position

Abstract

Abstract CuCoNi granular films were prepared by electrodeposition, and the magnetoresistance were measured. The results show that the content of Ni is favorable for separation of more magnetic particles in the films. More Ni addition would decrease the concentration of magnetic particles. XRD analysis showed that the addition of Ni is in favor of magnetic particles of layer depositing. Excessive Ni added in the film but reduced concentration of magnetic particles. The layer complete phase separation after 600 °C annealing, corresponding to the copper diffraction peak intensity reaches the maximum; There is a clear satellite peaks at the between Co and Ni diffraction peak. Vacuum annealing make superparamagnetic particles into ferromagnetic particles, improve the coercivity. The GMR results show that 450 °C heat treatment to achieve the best film structure, with a maximum GMR, higher temperatures will form a ternary alloy phase in making the film, the GMR value is the lower.