Magnetic and electrical transport properties on (La0.7Sr0.3MnO3)1−x/(CuFe2O4)x composites

Abstract

The magnetic and electrical properties of (La0.7Sr0.3MnO3)1−x/(CuFe2O4)x have been investigated. The (La0.7Sr0.3MnO3)1-x/(CuFe2O4)x composites with x = 0, 0.01, 0.03, 0.06 and 0.09 wt.% were prepared by conventional solid state reaction method, respectively. The structures, morphology, magnetic and electrical properties of the samples have been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and physical property measurement system (PPMS). The resistance measured as a function of temperature demonstrates that the pure LSMO samples display metal to semiconductor transition. On the other hand, the others indicated semiconductor/insulator behaviors. The MR was measured in an applied magnetic field of 0.5T. The results clearly show that the magnetoresistance (MR) effect is enhanced at a wide temperature range with CuFe2O4 composition. It may be helpful to improve the low-field magnetoresistance (LFMR) under the influence of the spin-polarized tunneling and the spin-dependent scattering.