2023 年 64 巻 8 号 p. 2014-2017
The partial substitution of Cu for Co was found to be effective in improving the magnetostrictive properties of CoFe2O4. The magnetic field dependence of the strain for the CuxCo1−xFe2O4 samples with a cubic spinel structure showed a larger strain magnitude at lower magnetic fields as x increased to 0.6. As a result, the sample with x = 0.6 demonstrated the strain of approximately 511 ppm by changing the direction of 1 T magnetic field. This value was approximately 1.6 times larger than that of Galfenol, a commercial magnetostrictive material without rare-earth elements. Such superior magnetostrictive properties were not obtained in the samples with x ≥ 0.7 containing a tetragonal structure. Therefore, the cubic spinel CuxCo1−xFe2O4 system is a promising candidate for rare-earth-free magnetostrictive materials.
