Strong correlations between Structural and Magnetic Properties of Zn and Zr Substituted CuFe2O4 for Magnetic Temperature Controller applications

The effects of tetravalent and divalent substitution on the physical properties of Cu ferrites, prepared by a double sintering ceramic technique, have been investigated. It was found that substitution of Zn and Zr simultaneously enhanced sintering process and crystallization. The initial permeability drops sharply at certain temperature for stoichiometric composition, which makes Zn/Zr co-doped NiFe2O4 spinel ferrites a very promising candidate for magnetic switch, magnetic temperature transducer (MTT) and temperature sensitive controller devices. Thus, the change of Curie temperature could be simply controlled by controlling the contents of Zn and Zr within CuFe2O4. From magnetic hysteresis loop measurements, magnetic moment increases by Zn and Zr substitution.