Magnetization and magnetoresistance of Fe3O4 prepared by ball milling method

Abstract

Recently, magnetoresistance effects have been found in the metal oxides produced by variety of methods. We have investigated the magnetoresistance (MR) effect of magnetite (Fe3O4) produced by Ball Milling. MR ratio was increased from 1.4% to 2.2% after ball milling for 10 hours. After annealing at 623 K for 1 hour, MR ratio increased to 3.3%. It seems that the origin of the magnetoresistance effects for the magnetite Fe3O4 is related to the precipitation of Fe2O3. MR ratio increased monotonically with decreasing of temperature, and showed 4% at the temperature of 100 K.