Two-dimensional multiferroic material of metallic p-doped SnSe

Abstract

Two-dimensional (2D) multiferroic materials have garnered broad interests attributed to their fascinating magnetoelectric properties and energy-efficient multifunctional device applications. Multiferroic heterostructures have recently been realized, nevertheless, the direct coupling between ferroelectric and ferromagnetic order in a single material still remains a daunting challenge, especially for 2D materials. Herein, we develope a simple physical vapor deposition approach to synthesize 2D p-doped SnSe. The local phase segregation of SnSe2 microdomains and accompanying interfacial charge transfer result in the emergence of degenerate semiconductor and metallic feature in SnSe. Intriguingly, the room-temperature ferrimagnetism has been demonstrated first in 2D p-doped SnSe with the Curie temperature approaching to ~337 K. Meanwhile, the robust in-plane ferroelectricity is maintained even under the depolarizing field introduced by SnSe2. The coexistence of ferrimagnetism and ferroelectricity in 2D metallic p-doped SnSe verifies its multiferroic feature. This work presents a significant advance for exploring the magnetoelectric coupling in 2D limit and constructing high-performance logic devices to extend Moore's law.

Anisotropy in Multiferroic CuCrP2S6

“…Compared to the traditional systems, two-dimensional (2D) van der Waals (vdW) materials exhibit obviously different and novel physical properties with stable layered structures consisting of strong intralayer and weak interlayer forces [9][10][11][12] . In addition, 2D vdW materials are feasible to stack and integrate with various materials down to the atomic-layer thickness, successfully avoiding size or interface issues [13][14][15][16] .…”