High magnetostriction with low saturation field in highly 〈0 0 1〉 textured CoFe2O4 by magnetic field alignment

We report the magnetostriction and 〈0 0 1〉 texture of anisotropic polycrystalline CoFe2O4. Slurries with well dispersion and low sintering shrinkage are aligned by the magnetic field of 2 T and sintered to prepare highly 〈0 0 1〉 textured CoFe2O4 samples. For the anisotropic sample, benefiting from the 〈0 0 1〉 fiber texture, a higher magnetostrictive property is achieved than that of isotropic polycrystalline sample prepared by dry compaction. The maximum magnetostriction up to −500 ppm at 1000 Oe is obtained, which reaches 85% of the highest value in single crystal (λ100 = −590 ppm). Meanwhile, the maximum strain-field derivative is also improved to −0.97 ppm/Oe at 250 Oe, which is highly beneficial for sonar detector and force sensor applications.