Hou Cong, Sun Yibo, Lu Yuhang, Li Zimo, Ni Jun
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
Frontier Science Center for Quantum Information, Beijing 100084, China.
Nanoscale. 2024 Oct 24;16(41):19276-19283. doi: 10.1039/d4nr02308k.
Two-dimensional multiferroic materials that exhibit both ferroelectricity and ferromagnetism provide a new platform for the discovery and regulation of magnetic skyrmions. In this study, we utilize first-principles calculations and Monte Carlo simulations to explore the properties and regulation of magnetic skyrmions in a novel multiferroic monolayer, MnOBr. MnOBr exhibits skyrmions without the need for an external magnetic field. Upon applying an external magnetic field, we found the disappearance of labyrinth domains and the formation of a periodic arrangement of the skyrmion lattice. By employing machine learning techniques, we depict a phase diagram of MnOBr under varying magnetic fields and biaxial strain, which provides a detailed depiction of phase transitions of spin textures in monolayer MnOBr. Furthermore, in MnOBr/CdClBr heterostructures, we demonstrate that the creation and annihilation of magnetic skyrmions can be controlled by switching the polarization direction of the Janus CdClBr. These findings show potential applications of MnOBr as a 2D magnetic skyrmion material in spintronic devices.
兼具铁电性和铁磁性的二维多铁性材料为磁斯格明子的发现和调控提供了一个新平台。在本研究中，我们利用第一性原理计算和蒙特卡罗模拟来探索新型多铁性单层MnOBr中磁斯格明子的性质和调控。MnOBr无需外部磁场就能展现出斯格明子。施加外部磁场后，我们发现迷宫畴消失，斯格明子晶格形成周期性排列。通过运用机器学习技术，我们描绘了MnOBr在不同磁场和双轴应变下的相图，该相图详细描述了单层MnOBr中自旋纹理的相变。此外，在MnOBr/CdClBr异质结构中，我们证明了通过切换Janus CdClBr的极化方向可以控制磁斯格明子的产生和湮灭。这些发现表明MnOBr作为二维磁斯格明子材料在自旋电子器件中具有潜在应用。
