Structure and Giant Magnetoresistance in Zinc Ferrite

摘要

The tunneling structure of ZnFe_(3-x)O_4 ferrite was confirmed by high resolution electron microscopy (HREM), non-Ohmic I-V curve and kinetics for alpha-Fe_2O_3 isothermal phase transformation. The Zn_(0.41)Fe_(2.59)O_4/alpha-Fe_2O_3 two-phasepolycrystalline has a huge tunneling magnetorsistance( TMR) mainly caused by the tunneling structure . The Zn_(0.41)Fe_(2.59)O_4 grains are separated by insulating alpha-Fe_2O_3 thin layer boundaries. The pattern of nanoslructure was verified by HREM.