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The polar magnet CaBaCo$_{4}$O$_{7}$ is known to exhibit the largestmagnetic-field-driven electric polarization change ($\Delta P$) associated withan antiferromagnetic (AFM)-ferrimagnetic (FIM) transition in a narrowtemperature range between 62 and 69 K. In this work, we investigate the effectof Ni doping on its multiferroic properties, by means of magnetization,electric polarization, dielectric constant, and magnetostriction measurementson single crystals of CaBaCo$_{3.9}$Ni$_{0.1}$O$_{7}$ up to 50 T. In the dopedmaterial, two kinds of AFM phases appear below 78 K, accompanying negative$\Delta P$. Upon the application of a magnetic field along any crystallographicaxis, giant positive $\Delta P$ of up to $11 \sim 12$ mC/m$^{2}$ is observedalong with an AFM-FIM transition in the whole temperature range below 78 K. Thegiant magnetoelectric effect inherent in CaBaCo$_{4}$O$_{7}$ can be furtherenhanced just by a small amount of chemical substitution, in terms of (i)increasing the magnitude of $\Delta P$ and (ii) expanding the temperature rangein which giant $\Delta P$ appears.

Enhancement of giant magnetoelectric effect in Ni-doped CaBaCo$_{4}$O$_{7}$