Magnetoelectric coupling in Sr3Co2Fe23.04Al0.96O41 single crystal near room temperature

We have grown Z-type hexaferrite Sr3Co2Fe23.04Al0.96O41 single crystal with a little Al3+ ion doping on the Fe3+ ion sites by the Na2CO3-Fe2O3 flux method. The magnetic properties and magnetoelectric (ME) coupling effects were investigated systematically. With Al3+ ion doping, the transverse conical magnetic phase could be maintained up to 359 K under small magnetic field (H). The magnetization increases with two steps to saturation at 300 K as shown in the M -H curve, implying the existence of a spiral spin order. The ME coupling effects occur near room temperture. Besides, the sign of the electric polarization (P) is independent of the H and the intensity of the electric polarization changes without any decays at 200 K under the oscillating magnetic field. Both of them are crucial for device application, such as information storage devices and non-volatile memory. (c) 2022 Elsevier B.V. All rights reserved.