对拓扑自旋纹理进行电操纵对于发展基于拓扑磁性准粒子的自旋电子器件至关重要。最近,我们同中山大学侯仰龙教授和北京大学杨金波教授团队合作,在二维范德瓦尔斯多铁异质结LaX2(X = Cl、Br、I)/In2Y3(Y = S、Se、Te)中实现铁电场效应调控拓扑磁性准粒子。该研究通过第一性原理计算和微磁模拟发现,在LaCl2/In2S3、LaBr2/In2Se3和LaCl2/In2Se3异质结中,铁电(FE)极化反转能够调控铁磁(FM)单层中的磁阻挫,从而实现非平凡拓扑自旋纹理的产生和湮灭。特别地,在LaI2/In2Te3异质结中,铁电极化反转可以改变双半子(亦称双麦韧)的形态。此外,在铁磁单层中还观察到了半导体-半金属转变,这主要归因于界面电荷转移,使得电流驱动的运动成为可能。因此,研究人员研究了半金属中双半子团簇在100%自旋极化电流下的动力学,以及具有大拓扑数的斯格明子在磁场下的行为。这些结果表明,多铁异质结中可电调的拓扑磁织构在低功耗和非易失性信息技术领域具有潜在应用价值。
Electrical manipulation of topological spin textures is crucial for the development of spintronic devices based on topological magnetic quasiparticles. Recently, in collaboration with Prof. Yanglong Hou from Sun Yat-sen University and Prof. Jinbo Yang from Peking University, we achieved ferroelectric field-effect control of topological magnetic quasiparticles in two-dimensional van der Waals multiferroic heterostructures LaX2 (X = Cl, Br, I)/In2Y3 (Y = S, Se, Te). Through first-principles calculations and micromagnetic simulations, this study found that in the LaCl2/In2S3, LaBr2/In2Se3, and LaCl2/In2Se3 heterostructures, the ferroelectric (FE) polarization reversal can regulate the magnetic frustration in the ferromagnetic (FM) monolayer, thereby enabling the creation and annihilation of non-trivial topological spin textures. In particular, in the LaI2/In2Te3 heterostructure, the ferroelectric polarization reversal can change the morphology of bimerons. Moreover, a semiconductor-to-half-metal transition was observed in the FM monolayer, which is mainly attributed to the interfacial charge transfer, making current-driven motion possible. Therefore, the researchers investigated the dynamics of bimeron clusters in the half-metal under a 100% spin-polarized current and the behavior of skyrmions with large topological numbers under a magnetic field. These results indicate that the electrically tunable topological spin textures in multiferroic heterostructures have potential applications in low - power and non - volatile information technologies.
图1 二维多铁异质结中铁电极化对双半子拓扑织构非易失调控
上述成果发表于《先进功能材料》(Adv. Funct. Mater. 2504772),论文第一作者为博士研究生刘玮其。文章链接:https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adfm.202504772