Enhancement of giant magnetoelectric effect in Ni-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CaBaCo</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Abstract

The polar ferrimagnet CaBaCo${}_{4}$O${}_{7}$ exhibits the largest magnetic field driven electric polarization change \ensuremath{\Delta}$P$ reported so far in a narrow temperature range. Here, the authors demonstrate that only 2.5% of Ni substitution for Co increases the magnitude of \ensuremath{\Delta}$P$ by about 30%, as well as expanding the temperature range in which the giant \ensuremath{\Delta}$P$ appears down to a low temperature. This is attributable to the switching of the low-temperature zero magnetic field state from a ferrimagnetic to an antiferromagnetic state.

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