论文标题
由于CRA中的dzyaloshinskii-Moriya相互作用弱化，异常的呼吸磁体结构域收缩
Anomalous helimagnetic domain shrinkage due to the weakening of Dzyaloshinskii-Moriya interaction in CrAs
论文作者
论文摘要
CRAS是著名的Helimagnet，其双螺旋结构源自Dzyaloshinskii-Moriya互动（DMI）与抗Fiferromagnetic Exchange交互$ J $之间的竞争。通过共振软X射线散射（RSXS），我们观察到磁性峰（0〜0〜 $ Q_M $），它以$ T_S $ $ \ $ 267.5 k出现在螺旋过渡时。发现DMI在冷却方面的弱化在这里起着至关重要的作用。它导致螺旋波矢量变化，命令旋转旋转，并在局部缺陷处形成额外的helimagnetic域边界，从而导致呼吸磁体的异常收缩。我们的结果表明，可以通过在某些Helimagnets中调谐DMI来控制磁性螺旋结构域的大小。
CrAs is a well-known helimagnet with the double-helix structure originating from the competition between the Dzyaloshinskii-Moriya interaction (DMI) and antiferromagnetic exchange interaction $J$. By resonant soft X-ray scattering (RSXS), we observe the magnetic peak (0~0~$q_m$) that emerges at the helical transition with $T_S$ $\approx$ 267.5 K. Intriguingly, the helimagnetic domains significantly shrink on cooling below $\sim$255 K, opposite to the conventional thermal effect. The weakening of DMI on cooling is found to play a critical role here. It causes the helical wave vector to vary, ordered spins to rotate, and extra helimagnetic domain boundaries to form at local defects, thus leading to the anomalous shrinkage of helimagnetic domains. Our results indicate that the size of magnetic helical domains can be controlled by tuning DMI in certain helimagnets.
