Two-dimensional (2D) van der Waals (vdW) materials provide the versatile playground to stack two or more vdW layers for creation of superior materials with desired properties. Here we theoretically adopt a twisted stack-engineering of two LaBr₂ monolayers to break space inversion symmetry for ferroelectricity and ultimately multiferroism. The enhancement and reversal of electric polarization are accompanied with the transition from interlayer ferromagnetic and antiferromagnetic orderings, demonstrating an effective magnetoelectric coupling effect with a mechanism dissimilar to that of the conventional multiferroics. Magnetization dynamics simulations show that such magnetic phase transition can excite topologically protected bimeron, and the skyrmion Hall effect can be suppressed by bilayer-bimeron stabilized in both ferromagnetic and antiferromagnetic configurations. Moreover, in the small-angle twisted moiré superlattice, the uniform polarization will evolve into a staggered domain structure, accompanied with the appearance of bimeron, which forms a significant discrepancy with the non-twisted stack-engineered multiferroic LaBr₂ bilayer. This work provides a strategy for 2D multiferroic materials by twisted stack engineering of magnetic single layers.

二维 (2D) 范德华 (vdW) 材料为堆叠两个或多个 vdW 层提供了多功能场地，以创建具有所需特性的优质材料。在这里，我们理论上采用了两个 LaBr _{2的扭曲堆叠工程}单层打破铁电性和最终多铁性的空间反转对称性。电极化的增强和反转伴随着层间铁磁和反铁磁有序的转变，证明了有效的磁电耦合效应，其机制与传统多铁性材料不同。磁化动力学模拟表明，这种磁相变可以激发拓扑保护的 bimeron，并且可以通过在铁磁和反铁磁结构中稳定的双层-bimeron 抑制斯格明子霍尔效应。此外，在小角度扭曲莫尔超晶格中，均匀极化会演变成交错畴结构，伴随着bimeron的出现，₂双层。这项工作通过磁性单层的扭曲堆叠工程为二维多铁性材料提供了一种策略。