Compositional Dependence of Magnetostrictive Properties of Cobalt Ferrite

Compositional dependence of magnetostrictive properties of three series of samples with compositions CoMnxFe2-xO4, Co1+xSixFe2-2xO4 and CoSixFe2-xO4 (x = 0 to 0.6) have been investigated. Manganese/silicon substituted cobalt ferrites have shown maximum strain derivative values as compared to pure cobalt ferrite which makes these materials promising for magnetostrictive sensing applications. The results are explained on the basis of cation distribution, valence states of different cations with preferential occupation of lattice sites, and their magnetostrictive contributions.