单层Janus二维磁体中利用单个超快激光脉冲写入与擦除斯格明子
Writing and erasing skyrmions by single ultrafast laser pulses in monolayer Janus 2D magnets
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中文总结 AI 辅助
本研究在Janus二维硫族化铬中实现无场稳定的奈尔型斯格明子，通过Janus表面增强的Dzyaloshinskii-Moriya相互作用为其稳定提供机制，还可利用单个超快激光脉冲在低磁场下可逆操控斯格明子，为低功耗自旋电子器件提供新途径。
中文摘要 AI 辅助
二维磁体中的斯格明子是实现非易失、低功耗、高密度自旋电子存储的有前景候选材料，但受限于所需手性磁相互作用的工程化难度，其在二维极限下的实验实现仍具挑战性。本研究利用同步辐射X射线光发射电子显微镜和扫描氮空位磁力计，在Janus二维硫族化铬中实现了奈尔型斯格明子的生成与直接成像，该斯格明子具有无场稳定性、非易失性和尺寸可调性。第一性原理计算与微磁模拟表明，Janus表面诱导的反演对称性破缺增强了Dzyaloshinskii-Moriya相互作用，为斯格明子的稳定与可调提供了微观机制。研究进一步在低至300 Oe的磁场下，利用单个超快激光脉冲实现了斯格明子的可逆写入与擦除，展现了该二维磁系统的优异可操控性。这些结果确立了Janus工程作为在原子级薄磁体中生成与操控非易失斯格明子的可行途径，对基于斯格明子的低功耗自旋电子器件具有重要意义。
英文摘要
Skyrmions in 2D magnets are promising candidates for nonvolatile, low-power, and high-density spintronic memories. However, their experimental realization at the 2D limit remains challenging, owing to the difficulty in engineering the required chiral magnetic interactions. Here, we report the creation and direct imaging of Néel-type skyrmions in Janus 2D chromium chalcogenides using synchrotron X-ray photoemission electron microscopy, and scanning nitrogen-vacancy magnetometry, which exhibit field-free stability, nonvolatility, and size tunability. First-principles calculations and micromagnetic simulations reveal that Janus-surface-induced inversion-symmetry breaking enhances the Dzyaloshinskii-Moriya interaction, providing the microscopic mechanism for skyrmion stabilization and tunability. We further achieve reversible skyrmion writing and erasing using a single ultrafast laser pulse in a magnetic field as low as 300 Oe, demonstrating the excellent manipulability of this 2D magnetic system. These results establish Janus engineering as a route to creating and manipulating nonvolatile skyrmions in atomically thin magnets, with implications for skyrmion-based low-power spintronic devices.
