High-pressure single crystal growth and magnetoelectric properties of CdMn 7 O 12 .

The concurrent presence of large electric polarization and strong magnetoelectric coupling is quite desirable for protentional applications of multiferroics. In this paper, we report the growth of CdMn 7 O 12 single crystals by flux method under a high pressure of 8 GPa for the first time. An antiferromagnetic (AFM) order with a polar magnetic point group is found to occur at the onset temperature of T N1 = 88 K (AFM1 phase). As a consequence, the pyroelectric current emerges at T N1 and gradually increases and reaches its maximum at T set = 63 K, at which the AFM1 phase finally settles down. Below T set , CdMn 7 O 12 single crystal exhibits a large ferroelectric polarization up to 2640 µC/m 2 . Moreover, the spin-induced electric polarization can be readily tuned by applying magnetic fields, giving rise to considerable magnetoelectric coupling effects. Thus, the current CdMn 7 O 12 single crystal acts as a rare multiferroic system where both large polarization and strong magnetoelectric coupling merge concurrently.