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The single crystal study of CaBaCo4O7, a non collinear ferrimagnet (TC=64K),with a polar orthorhombic space group (Pbn21) between 4 K and 293 K, shows theappearance below TC of a large electric polarization along its c axis, reaching17mC.m-2 at 10K. At 62.5K, a magnetic field driven giant variation ofpolarization, P(9T)-P(0T)=8mC.m-2, is observed. Moreover, the presentmagnetoelectric measurements, are fully consistent with the m'm2' magneticpoint group, strongly supporting that this oxide is also ferrotoroidic. Thisferrimagnetic oxide, which belongs to the '114' structural family, opens anavenue for the search of new magnetoelectrics.

Gigantic magnetic field polarization and magnetoelectric coupling in a ferrimagnetic oxide CaBaCo4O7