Study on anomalous magnetoresistance in nano-Fe3O4/Ag granular system

The possibility of AgCl remainder was confirmed in the production process of nano-Fe3O4/Ag granular system. The AgCl impurities contributed to large negative MR-ratio of about −4 and −6% at 300 K and 1 T for x* = 0.05 and 0.20 samples, respectively, where x* is the nominal Ag volume fraction of VAg/(VFe3O4+VAg)(VFe3O4+VAg). It was suggested that the formation of insulating AgCl barriers were effective for the large MR ratio in nano-Fe3O4 system.