Electric-field-induced fully compensated ferrimagnetism in experimentally synthesized monolayer MnSe

Abstract

Owing to their inherent characteristics of zero stray field and terahertz dynamics, two-dimensional (2D) zero-net-magnetization magnets demonstrate the potential for miniaturization, ultradensity, and ultrafast performance. Recently, fully compensated ferrimagnet of 2D zero-net-magnetization magnets has already attracted attention, as it can exhibit global spin-splitting, magneto-optical response, and the anomalous Hall effect [Liu et al., Phys. Rev. Lett. 134, 116703 (2025)]. Therefore, it is very important to provide experimentally feasible strategies and materials to achieve fully compensated ferrimagnets. Here, we use the experimentally synthesized A-type PT-antiferromagnet [the joint symmetry (PT) of space inversion symmetry (P) and time-reversal symmetry (T)] MnSe as the parent material to induce fully compensated ferrimagnetism through an out-of-plane electric field. This electric field can remove the P symmetry of the lattice, thereby breaking the PT symmetry and inducing spin-splitting. When considering spin–orbital coupling, MnSe with an out-of-plane magnetization can achieve the anomalous valley Hall effect. In addition, we also discuss inducing fully compensated ferromagnetism via Se vacancies and Janus engineering. Our works can promote the further development of 2D fully compensated ferrimagnets both theoretically and experimentally.