论文标题
热循环诱导的堆叠顺序变化和室温下的自旋窗口van der waals磁铁fe $ _5 $ gete $ _2 $
Thermal cycling induced alteration of the stacking order and spin-flip in the room temperature van der Waals magnet Fe$_5$GeTe$_2$
论文作者
论文摘要
准二维范德华磁铁磁铁Fe $ _ {5-δ} $ gete $ _2 $（F5GT）的磁性特性，该$ _2 $（F5GT）具有高铁磁订购温度$ t _ {\ text {\ text {c}}} $ $ 315 K，仍然可以更好地理解。已经证明，F5GT的磁化对Fe缺乏$δ$和热循环历史均敏感。在这里，我们利用组合的X射线和中子散射技术研究了F5GT的结构和磁性。我们的研究表明，在$ t _ {\ text {s}} $ $ $ \ sim $ 110 k时，淬火后的F5GT单晶体经历了不可逆的一阶过渡时，首先冷却时，堆叠订单部分或完全从ABC堆栈转换为AA堆叠订单。重要的是，热循环后的磁性特性，包括磁矩方向和增强的$ t _ {\ text {c}} $，与堆叠顺序的改变密切相关。我们的工作突出了晶格对称性对F5GT中磁性的重要影响。
The magnetic properties of the quasi-two-dimensional van der Waals magnet Fe$_{5-δ}$GeTe$_2$ (F5GT), which has a high ferromagnetic ordering temperature $T_{\text{C}}$ $\sim$ 315 K, remains to be better understood. It has been demonstrated that the magnetization of F5GT is sensitive to both the Fe deficiency $δ$ and the thermal cycling history. Here, we investigate the structural and magnetic properties of F5GT with a minimal Fe deficiency ($|δ|$ $\le$ 0.1), utilizing combined x-ray and neutron scattering techniques. Our study reveals that the quenched F5GT single crystals experience an irreversible, first-order transition at $T_{\text{S}}$ $\sim$ 110 K upon first cooling, where the stacking order partly or entirely converts from ABC-stacking to AA-stacking order. Importantly, the magnetic properties, including the magnetic moment direction and the enhanced $T_{\text{C}}$ after the thermal cycling, are intimately related to the alteration of the stacking order. Our work highlights the significant influence of the lattice symmetry to the magnetism in F5GT.
