Magnetocapacitance effect in multiferroicBiMnO3

We have investigated the structural, magnetic, and electric properties of ferromagnetic ${\mathrm{BiMnO}}_3$ with a highly distorted perovskite structure. At $T_E=750\mathrm{}–770\mathrm{K},$ a centrosymmetric–to–non-centrosymmetric structural transition takes place, which describes of the ferroelectricity in the system. The changes in the dielectric constant were induced by the magnetic ordering ${(T}_M\approx 100\mathrm{K})$ as well as by the application of magnetic fields near $T_M.$ These features are attributed to the inherent coupling between the ferroelectric and ferromagnetic orders in the multiferroic system.