The application discloses a kind of multiferroic materials and design method based on interlayer
electron self-
doping mechanism.The material is composed of two-dimensional van der waals homodimer structure with
intermediate energy band filling characteristics, break space inversion symmetry by spontaneous interlayer charge transfer, stabilize antiferromagnetic sequence in one layer, stabilize ferromagnetic sequence in another layer, and simultaneously induce out-of-plane ferroelectric polarization;
Ferroelectricity and magnetic sequence realize inherent
strong coupling through charge transfer direction.The design method includes
material selection, double-layer construction and symmetry breaking trigger steps.It is confirmed by first-principle calculation that the multiferroic of double-layer CrTe2 and FeTe, the
transition temperature of CrTe2 can reach more than 350K, and the polarization and magnetic sequence can be reversibly switched by external
electric field.The application also prepares double-layer CrTe2 multiferroic material, and confirms that the multiferroic material designed by the application is achievable.The application provides a general and feasible solution for developing
room temperature,
strong coupling two-dimensional multiferroic devices.