Anomalous helimagnetic domain shrinkage due to the weakening of the Dzyaloshinskii-Moriya interaction in CrAs
Anomalous helimagnetic domain shrinkage due to the weakening of the Dzyaloshinskii-Moriya interaction in CrAs
复制标题
CrAs 中 Dzyaloshinskii-Moriya 相互作用减弱导致异常螺旋磁畴收缩
DOI：
10.1103/physrevb.102.104432
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发表时间：
2020
影响因子：
3.7
通讯作者：
D. L. Feng
中科院分区：
文献类型：
--
作者：
B. Y. Pan;H. C. Xu;Y. Liu;R. Sutarto;F. He;Y. Shen;Y. Q. Hao;J. Zhao;Lel;Harriger;D. L. Feng
CrAs是一种具有双螺旋结构的铁磁体，其结构源于Dzyaloshinskiii-Moriya相互作用和反铁磁交换相互作用的竞争。通过共振软X射线散射，我们观察到的磁峰（0 0）出现在螺旋过渡与。有趣的是，helmagnetic域显着收缩冷却低于，相反的传统的热效应。削弱的介子冷却被发现在这里发挥关键作用。它导致螺旋波矢量的变化，有序自旋旋转，和额外的helmagnetic域边界形成在局部缺陷，从而导致helmagnetic域的异常收缩。我们的研究结果表明，磁螺旋畴的大小可以通过调整在某些helimagnets。
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. By resonant soft-x-ray scattering, we observe the magnetic peak (0 0) that emerges at the helical transition with. Intriguingly, the helimagnetic domains significantly shrink on cooling below, 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.