Two-dimensional (2D) multiferroics have attracted increasing interests in basic science and technological fields in recent years.However,most reported 2D magnetic ferroelectrics are based on the d-electron magnetism,w...Two-dimensional (2D) multiferroics have attracted increasing interests in basic science and technological fields in recent years.However,most reported 2D magnetic ferroelectrics are based on the d-electron magnetism,which makes them rather rare due to the empirical d^(0) rule and limits their applications for low magnetic phase transition temperature.In this work,we demonstrate that the ferroelectricity can coexist with the p-electron-induced ferromagnetism without the limitation of d^(0) rule and metallicity in a family of stable 2D MXene-analogous oxynitrides,X_(2)NO_(2) (X = In,Tl).Remarkably,the itinerant character of p electrons can lead to the strong ferromagnetic metallic states.Furthermore,a possible magnetoelectric effect is manifested in a Tl_(2)NO_(2)/WTe_(2) heterostructure through the interface engineering.Our findings provide an alternative possible route toward 2D multiferroics and enrich the concept of ferroelectric metals.展开更多
基金This work was supported by the Science and Technology Development Fund(FDCT)from Macao SAR(0081/2019/AMJ,0102/2019/A2,and 0154/2019/A3)。
文摘Two-dimensional (2D) multiferroics have attracted increasing interests in basic science and technological fields in recent years.However,most reported 2D magnetic ferroelectrics are based on the d-electron magnetism,which makes them rather rare due to the empirical d^(0) rule and limits their applications for low magnetic phase transition temperature.In this work,we demonstrate that the ferroelectricity can coexist with the p-electron-induced ferromagnetism without the limitation of d^(0) rule and metallicity in a family of stable 2D MXene-analogous oxynitrides,X_(2)NO_(2) (X = In,Tl).Remarkably,the itinerant character of p electrons can lead to the strong ferromagnetic metallic states.Furthermore,a possible magnetoelectric effect is manifested in a Tl_(2)NO_(2)/WTe_(2) heterostructure through the interface engineering.Our findings provide an alternative possible route toward 2D multiferroics and enrich the concept of ferroelectric metals.
