麻豆淫院

Recently, Prof. Zheng Xiaohong's research group from the Institute of Solid State 麻豆淫院ics (ISSP) of the Hefei Institutes of 麻豆淫院ical Science (HFIPS), in cooperation with Prof. Stefano Sanvito from Trinity College Dublin, demonstrated a novel idea to achieve half-metallicity in A-type van der Waals (vdW) antiferromagnets via ferroelectric control.

Half-metallicity is an important research topic in condensed matter physics and spintronics. Recently, an interesting class of two-dimensional (2-D) materials, vanadium dichalcogenides exhibiting intrinsic ferromagnetism and high Curie temperature, has been theoretically designed and experimentally synthesized. However, the required critical electric field for achieving half-metallicity is so high that it is almost unavailable under present conditions.

This time, the team reported a vdW multiferroic heterostructure, which was formed by sandwiching the bilayer ²H-VSe₂ between two layers of 2-D out-of-plane ferroelectric Sc₂CO₂, via first-principles simulations.

They found a half-metallic nature presented in the band structure as well as the conducting spin channel localized in only one layer of ²H-VSe₂.

Meanwhile, the spin polarity and the spatial location would be reversed with the ferroelectric polarization reversal. The mechanism behind this phenomenon originated from both the built-in electric field of the ferroelectric sandwich, and the charge transfer selectively occurring only at one interface.

Two prototypes of nonvolatile memory devices were therefore further proposed, in which two states ("1" and "0") were realized by switching the polarization direction of the ferroelectric layers.