Landau-Khalatnikov Simulation for Magnetoelectric Coupling in CoFe2O4-BaTiO3 Composites

Abstarct 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 γ P 2 M 2 in thermodynamic free energy density functional for LK simulation, the hysteretic ME coupling coefficients, α M E ( 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 α M E are proportional to γ in the broad ranges of more than 7 orders of magnitude.