The perovskite oxide interface has attracted extensive attention as a platform for achieving strong coupling between ferroelectricity and magnetism. In this work, robust control of magnetoelectric (ME) coupling in the BiFeO₃/BaTiO₃ (BFO/BTO) heterostructure (HS) was revealed by using the first-principles calculation. Switching of the ferroelectric polarization of BTO induce large ME effect with significant changes on the magnetic ordering and easy magnetization axis, making up for the weak ME coupling effect of single-phase multiferroic BFO. In addition, the Dzyaloshinskii-Moriya interaction (DMI) and the exchange coupling constants J for the BFO part of the HSs are simultaneously manipulated by the ferroelectric polarization, especially the DMI at the interface is significantly enhanced, which is three or four times larger than that of the individual BFO bulk. This work paves the way for designing new nanomagnetic devices based on the substantial interfacial ME effect.

钙钛矿氧化物界面作为实现铁电和磁性之间强耦合的平台已引起广泛关注。在这项工作中，通过第一性原理计算揭示了BiFeO ₃ / BaTiO ₃（BFO / BTO）异质结构（HS）中磁电（ME）耦合的鲁棒控制。BTO的铁电极化的切换引起大的ME效应，其磁序有明显变化，易磁化轴变大，弥补了单相多铁BFO的弱ME耦合效应。此外，Dzyaloshinskii-Moriya相互作用（DMI）和交换耦合常数J对于HS的BFO部分，通过铁电极化同时对其进行操作，尤其是界面处的DMI显着增强，这比单个BFO块的DMI大三到四倍。这项工作为基于实质性界面ME效应设计新的纳米磁性设备铺平了道路。