Two-dimensional(2D)intrinsic multiferroics have attracted considerable attention for the next generation of advanced information technologies.Herein,we report that bilayer Janus FeSCl,a novel 2D system designed by sub...Two-dimensional(2D)intrinsic multiferroics have attracted considerable attention for the next generation of advanced information technologies.Herein,we report that bilayer Janus FeSCl,a novel 2D system designed by substituting sulfur in monolayer 1T-FeCl_(2),exhibits a giant spontaneous valley polarization and intrinsic magnetoelectric coupling.This Janus structure exhibits a ground-state bilayer structure that breaks space-inversion symmetry,enabling sliding ferroelectricity.Each monolayer displays robust intralayer ferromagnetic ordering,while the bilayer hosts interlayer antiferromagnetic alignment with opposing magnetic moments.Crucially,ferrovalley-mediated coupling links ferroelectric polarization and antiferromagnetic order,allowing electric-field-driven magnetic reversal.Notably,the direction of the net magnetic moment can be reversed through ferroelectric polarization switching,enabling nonvolatile control of the magnetism.The elucidated mechanisms are generalizable to diverse 2D material families,offering a universal framework for designing atomic-scale multiferroics.This work not only establishes foundational insights into 2D multiferroics but also advances the understanding of coupled charge-spin-valley physics in low-dimensional systems.展开更多
基金support fromthe National Natural Science Foundation of China(Grants No.12404267,No.12404048,No.12404104).
文摘Two-dimensional(2D)intrinsic multiferroics have attracted considerable attention for the next generation of advanced information technologies.Herein,we report that bilayer Janus FeSCl,a novel 2D system designed by substituting sulfur in monolayer 1T-FeCl_(2),exhibits a giant spontaneous valley polarization and intrinsic magnetoelectric coupling.This Janus structure exhibits a ground-state bilayer structure that breaks space-inversion symmetry,enabling sliding ferroelectricity.Each monolayer displays robust intralayer ferromagnetic ordering,while the bilayer hosts interlayer antiferromagnetic alignment with opposing magnetic moments.Crucially,ferrovalley-mediated coupling links ferroelectric polarization and antiferromagnetic order,allowing electric-field-driven magnetic reversal.Notably,the direction of the net magnetic moment can be reversed through ferroelectric polarization switching,enabling nonvolatile control of the magnetism.The elucidated mechanisms are generalizable to diverse 2D material families,offering a universal framework for designing atomic-scale multiferroics.This work not only establishes foundational insights into 2D multiferroics but also advances the understanding of coupled charge-spin-valley physics in low-dimensional systems.
