Antisite disorder-driven large electric polarization in multiferroic Nd2CoMnO6

The discovery of magnetism-driven ferroelectricity has recently given new hope for multiferroic devices, but very low magnetic ordering temperature as well as negligibly small electric polarization in these systems are still a challenge. Here, we report a new collinear magnetic multiferroic, Nd₂ CoMnO₆ ({{T_C} ∼ 150} K) with a spontaneous electric polarization, {P_S}≃ 1.3 ~μ C cm^-2 , much higher than the other known magnetic multiferroics. The high polarization value has been associated to the intrinsic \uparrow\uparrow\downarrow\downarrow spin ordering-driven broken symmetry and the high degree of antisite disorder present in the system, which are confirmed through dc magnetization measurements.