To improve its conductivity, Ag/ Fe3O4 was prepared by electroless plating of silver on the surface of
Fe3O4, and in this way, we get composite material with excellent electromagnetic property. Before electroless plating,
Fe3O4 should be pretreated, which includes roughening, sensitization and activation. Results show that Ag was successfully
coated on the surface of Fe3O4, with a thickness of about 25 to 100 nm, and the mass weight of Ag is
54． 47%. In addition, compared with Fe3O4, the conductivity of Ag/ Fe3O4 is 347. 15 S/ cm, which has increased
nine orders of magnitude. Furthermore, the saturation magnetization of Ag/ Fe3O4 is 29. 8 emu/ g.