Abstract
SiO2-coated Fe3O4 samples were prepared by the sol-gel processing with several reaction time conditions. The samples were sintered in vacuum at 1000°C for 2 hours. MR ratio became the maximum of 3.6% for 12.9 vol.% SiO2 sample. This value is large compared with that of Fe3O4 reported before. The magnetization and magnetoresistance are saturated at the same magnetic field of about 4 kOe, which suggests that the MR effect is caused by magnetic scattering.
