Abstract
The (1 − x) La 0.67Ca 0.33MnO 3/ xCuFe 2O 4 ( x = 0, 0.04, 0.07, 0.10 and 0.15) composites have been prepared and investigated systematically for their microstructure, electrical and magnetic properties. The X-ray diffraction and scanning electronic microscopy analysis reveal that both La 0.67Ca 0.33MnO 3 (LCMO) and CuFe 2O 4 phases are distributed in the composites. Compared with pure LCMO, an obvious enhancement of magnetoresistance is observed over a wide temperature range for the composites. Under 3 T field, the magnetoresistance rises from a base value 44.5% for pure LCMO, to a maximum value of 66.7% for x = 0.1 composite. Meanwhile, a weak temperature-dependent MR platform is observed in the temperature range from 210 K to 240 K. The MR enhancement is discussed in terms of spin-polarized intergrain tunneling due to enhanced magnetic disorder and magnetic coupling near boundaries between LCMO and CuFe 2O 4 grains.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
