通过磁性过渡金属元素掺杂获得高磁、室温铁磁性二维WS2的研究

本征抗磁性的二维WS2具有长的自旋扩散长度，在其中诱导出高磁化强度的室温铁磁性（高磁、室温铁磁性），可在自旋电子学器件上具有巨大的应用前景。本项目基于前期对二维WS2的制备及磁性研究，拟借助缺陷辅助磁性过渡金属元素（Mn、Fe、Co、Ni）的掺杂，实现对掺杂因素（元素、浓度及构型）的有效调控，探讨各掺杂因素对自旋浓度及磁耦合作用的调控机制，进而基于掺杂引入高浓度铁磁耦合的自旋，制备获得高磁、室温铁磁性二维WS2；同时采用第一性原理计算电子结构，揭示通过磁性过渡金属元素掺杂引入高浓度自旋、促进铁磁耦合的微观机理。通过实验与理论研究相结合，得到通过磁性过渡金属元素的可控掺杂获得高磁、室温铁磁性二维WS2的实验途径，并揭示各元素掺杂的差异及其诱导铁磁性机制，为二维WS2的诱导磁有序研究提供实验参考和理论依据。

Despite the two-dimensional WS2 (2D-WS2) is nonmagnetic, which has high spin diffusion length. Obtaining room-temperature ferromagnetism with high magnetization, the 2D-WS2 would has wide application prospects in spintronic devices. Based on our research of the synthesis and magnetism of the 2D-WS2, this present project propose to doping magnetic transition elements (Mn, Fe, Co and Ni) in 2D-WS2 with the assistance of defects, the doping factors (element, concentration and configuration) would be effectively controlled, the mechanism of the doping factors on spin density and magnetic coupling will be discussed, high density spin with ferromagnetic coupling will be introduced, and then the room-temperature ferromagnetism with high magnetization will be obtained. Meanwhile, the electronic structures will be calculated to reveal the microscopic mechanism of the magnetic transition elements doping on the increasing of spin density and magnetic coupling. According to the experimental and theoretical research, the experimental approach of achieving room-temperature ferromagnetism in 2D-WS2 with high magnetization through doping of magnetic transition elements will be obtained, and then the different contribution of the elements to the magnetization and their mechanism of inducing ferromagnetism will be revealed. This proposed research would be instructive to the theoretical and experimental research of obtaining magnetic order in 2D-WS2.