CaBaCo4O7 : A ferrimagnetic pyroelectric
Abstract
Magneto-electric coupling in pyroelectric CaBaCo4O7 is investigated using ab-intio calculations and Landau theory. The former shows that exchange-striction is strong enough to produce a giant change in electric polarization upon ferrimagnetic ordering, comparable to the experimentally determined value of ~17 mC/m2 . Furthermore, Landau theory demonstrates that magneto-elastic coupling in CaBaCo4O7 is responsible for the strong magneto-electric coupling appearing close to the magnetic phase transition.
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