The magnetostrictive properties of Cu0.5Co0.5Fe2.0O4 were controlled via partial substitution with various trivalent ions. A single-phase cubic spinel structure was successfully obtained for the Cu0.5Co0.5X0.1Fe1.9O4 (X = Al, Cr, Mn, Ga, and In) samples, indicating that Fe3+ ions in Cu0.5Co0.5Fe2.0O4 can be partially substituted by Al3+, Cr3+, Mn3+, Ga3+, and In3+ ions. In the magnetic field dependence of the strain, the significant enhancement in magnetic field sensitivity of the strain at low magnetic fields was observed for the X = Mn and Ga samples. When the magnetization direction changed from parallel to perpendicular (or vice versa) to the measurement direction, the X = Mn and Ga samples demonstrated a larger strain magnitude at approximately half the magnetic field of CoFe2O4. Therefore, the partial substitution of trivalent ions, particularly Mn3+ and Ga3+ ions for Fe3+ ions, provides an effective strategy to develop superior magnetostrictive materials.
Hisamatsu et al. (Fri,) studied this question.