Coexistence of the ferroelectric polarization and spontaneous magnetization has been found in Y-type hexaferrite Ba 2 Mg 2 Fe 12 O 22 . The reversal of magnetization by a small magnetic field below ∼0.02 T accompanies an electric polarization reversal through the clamping of ferrimagnetic and ferroelectric domain walls. This behavior can be potentially used as a magnetically rewritable ferroelectric memory and an electrically rewritable magnetic memory.
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Taniguchi et al. (2008) studied this question.
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