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The influence of electric field on the structure parameters and magnetic states in BiFeO₃ multiferroic is studied using the Landau theory of phase transitions taking into account experimental data and results of ab initio calculations. Main features of structure transitions near critical electric fields and a concomitant rearrangementof the magnetic structure are discussed.
The detailed magneto-electron-lattice (vibronic) theory of ferroelectricity in the Bi-based multiferroics (BiFeO₃ etc.) is developed further. The vibronic admixture of the empty oxygen 2p states to the Bi 6s lone electron pair state leads to ferroelectricity. These interactions are the driving and restoring forces of the structural phase transformations of the Bi-based multiferroics. The free energy...
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