Ferroelectric Switching of Skyrmion Topology in 2D Multiferroics

Deterministic switching of skyrmion topology is a central frontier in topological spintronics, yet current paradigms rely almost exclusively on dissipative-current-driven spin torques. Here, we propose a fundamentally distinct mechanism for the nonvolatile switching of the skyrmion topology in two-dimensional multiferroics. We reveal that the intrinsic magnetoelectric coupling intimately links the out-of-plane ferroelectric polarization to interlayer magnetic exchange. Consequently, an electric-field-driven polarization reversal deterministically converts the interlayer coupling between the ferromagnetic and antiferromagnetic states. This macroscopic exchange reversal directly flips the microscopic skyrmion core polarity and reverses its topological charge, thereby stabilizing the two electrically addressable topological phases. Guided by our established design principles, we rigorously validate this mechanism in a Co2CF2/MoN2 multiferroic heterostructure by using combined first-principles calculations and atomistic spin simulations. Our findings bypass the limitations of continuous current injection, establishing a robust physical framework for energy-efficient multiferroic topological spintronics.