Reversal and non-reversal ferroelectric polarizations in a Y-type hexaferrite

The Cr ion doped Y-type hexaferrite Ba_0.5Sr_1.5Zn₂Fe_11.4Cr_0.6O₂₂ has been found to be a promising magnetoelectric material for the non-zero spontaneous electric polarization. A newly emerging transition at 183 K separates the low-field ferroelectric phase into two regions with reversal and non-reversal polarization respectively.