Gigantic magnetic-field-induced polarization and magnetoelectric coupling in a ferrimagnetic oxide CaBaCo{sub 4}O{sub 7}.

Authors

Caignaert, V.; Maignan, A.; Singh, K.; Simon, Ch.; Pralong, V.; Raveau, B.; Mitchell, J.; Zheng, H.; Huq, A.; Chapon, L.

Abstract

Below Tc, the single-crystal study of CaBaCo40„ a noncollinear ferrimagnet (Tc = 64 K) with a polar orthorhombic space group (Pbn21) between 4 and 293 K, shows a large change inthe electric polarization along its c axis reaching !!iP = 17 mC/m2 at 10 K. At 62.5 K, a magnetic-field-driven giant variation inpolarization P(9 T) - P(O T) = 8 mC/m2 is observed. Moreover, the present magnetoelectric measurements are fully consistent withthe m’m2’ magnetic point group. This ferrimagnetic oxide, which belongs to the “114” structural family, opens an avenue for the search for new magnetoelectrics.