Dielectric, Ferromagnetic Characteristics, and Room‐Temperature Magnetodielectric Effects in Double Perovskite La ₂ CoMnO ₆ Ceramics

Abstract

The magnetic, dielectric, and magnetodielectric properties of La 2 CoMnO 6 ceramics were evaluated together with the polarization‐electric field hysteresis loops. The phase segregation consisting of ordered and disordered regions was determined in the present ceramics. The ordering of Co 2+ and Mn 4+ gave rise to ferromagnetic transition temperature as high as 210 K, while the disordering of Co 3+ and Mn 3+ resulted in low ferromagnetic transition temperature of 80 and 150 K. The relaxor‐like behavior combined with a giant dielectric constant (∼10 5 ) was determined in La 2 CoMnO 6 ceramics, which was attributed to the charge ordering of Co 2+ and Mn 4+ . Owing to the mutual origin of magnetism and dielectric relaxation, La 2 CoMnO 6 ceramics showed considerable magnetodielectric effects (∼0.8% at 10 kOe) at room temperature.