Landau-Khalatnikov simulation for magnetoelectric coupling in CoFe2O4–BaTiO3 composites

The Landau-Khalatnikov (LK) simulation was used to study magnetoelectric (ME) coupling phenomena in a composite system of magneto-strictive CoFe2O4 (CF) and piezoelectric BaTiO3 (BT) materials, CF-BT. By adding ME coupling term with coupling parameter γ, between polarization, P and magnetization, M of γP2M2 in thermodynamic free energy density functional for LK simulation, the hysteretic ME coupling coefficients, αME(H) in CF-BT composite systems were well simulated and small changes of magnetic-field (H) dependent polarization, P(H) were calculated. The maximum values of αME are proportional to γ in the broad ranges of more than 7 orders of magnitude. [Display omitted] •The Landau-Khalatnikov simulation was used to study magnetoelectric coupling in a composite system of CoFe2O4 and BaTiO3.•By adding ME coupling term of γP2M2, the hysteretic ME coupling coefficients αME(H) were well simulated.•The maximum values of are proportional to in the broad ranges of more than 7 orders of magnitude.