论文标题
范德华（Van der Waals Feromagnet Fe $ _3 $ gete $ _2 $）表面的手性旋转螺旋
Chiral Spin Spirals at the Surface of the van der Waals Ferromagnet Fe$_3$GeTe$_2$
论文作者
论文摘要
受拓扑保护的磁性结构为低功耗设备提供了一个可靠的平台，用于计算和数据存储。这些结构的例子是天空，手性域壁和旋转螺旋。在这里，我们使用扫描电子显微镜和极化分析来揭示在零磁场的散装逆时针方向néel自旋螺旋中存在。这些néel自旋螺旋螺旋可在FGT的居里温度$ t_ \ mathrm {c} = 220 \ mathrm {〜k} $中生存，周期性$ p = 300 \ mathrm {〜nm} $的周期性变化很小。自旋螺旋的形成表现出逆时针旋转强烈表明FGT中存在阳性的dzyaloshinskii-moriya相互作用，这为理解FGT的磁结构提供了第一步。我们的结果还为范德华材料及其异质结构中的手性磁性铺平了道路。
Topologically protected magnetic structures provide a robust platform for low power consumption devices for computation and data storage. Examples of these structures are skyrmions, chiral domain walls, and spin spirals. Here we use scanning electron microscopy with polarization analysis to unveil the presence of chiral counterclockwise Néel spin spirals at the surface of a bulk van der Waals ferromagnet Fe$_3$GeTe$_2$ (FGT), at zero magnetic field. These Néel spin spirals survive up to FGT's Curie temperature $T_\mathrm{C}= 220 \mathrm{~K}$, with little change in the periodicity $p=300 \mathrm{~nm}$ of the spin spiral throughout the studied temperature range. The formation of a spin spiral showing counterclockwise rotation strongly suggests the presence of a positive Dzyaloshinskii-Moriya interaction in FGT, which provides the first steps towards the understanding of the magnetic structure of FGT. Our results additionally pave the way for chiral magnetism in van der Waals materials and their heterostructures.
