Synthesis of a magneto electric fluid based on a core shell architecture of Cobalt ferrite and Barium Titanate

In this paper, CoFe₂O₄ and CoFe₂O₄@BaTiO₃ (CFO@BTO) particles were prepared by hydrothermal method and sol-gel method, and the CFO@BTO multiferroic fluids with different surfactants were prepared by ball milling method, respectively. The stability, electric properties, and magnetoelectric coupling properties were investigated. From the XRD experimental results, the pure phase CFO@BTO composite particles were successfully prepared, and the HETEM images verified the core-shell structure. When the surfactant was 3-aminopropyltriethoxysilane, it had a good stability with a sedimentation rate of 4.6 % after 48 h From the dielectric constant as a function of frequency, the average value of the dielectric constant was 4.41. The saturated polarization strength was 8.33 nC/cm² and the residual polarization strength was 0.91 nC/cm² as shown in the hysteresis loop. In addition, it had a larger magnetodielectric coefficient (1.54 %) and magnetoelectric coupling coefficient (18.07 V/(cm·Oe)), which provide ideas to further enhance the magnetoelectric coupling effect.