Ferroelectric Polarization Reversal by a Magnetic Field in Multiferroic Y-type Hexaferrite Ba_2Mg_2Fe_(12)O_(22)

摘要

Coexistence of the ferroelectric polarization and spontaneous magnetization has been found in Y-type hexaferrite Ba_2Mg_2Fe_(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.