Ran Kejing, Tan Wancong, Sun Xinyu, Liu Yizhou, Dalgliesh Robert M, Steinke Nina-Juliane, van der Laan Gerrit, Langridge Sean, Hesjedal Thorsten, Zhang Shilei
School of Physical Science and Technology and ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai, China.
College of Physics & Center of Quantum Materials and Devices, Chongqing University, Chongqing, China.
Nat Commun. 2024 Jun 7;15(1):4860. doi: 10.1038/s41467-024-49288-9.
Magnetic skyrmions are topologically protected magnetization vortices that form three-dimensional strings in chiral magnets. With the manipulation of skyrmions being key to their application in devices, the focus has been on their dynamics within the vortex plane, while the dynamical control of skyrmion strings remained uncharted territory. Here, we report the effective bending of three-dimensional skyrmion strings in the chiral magnet MnSi in orthogonal thermal gradients using small angle neutron scattering. This dynamical behavior is achieved by exploiting the temperature-dependent skyrmion Hall effect, which is unexpected in the framework of skyrmion dynamics. We thus provide experimental evidence for the existence of magnon friction, which was recently proposed to be a key ingredient for capturing skyrmion dynamics, requiring a modification of Thiele's equation. Our work therefore suggests the existence of an extra degree of freedom for the manipulation of three-dimensional skyrmions.
磁斯格明子是拓扑保护的磁化涡旋，在手性磁体中形成三维弦。由于斯格明子的操控是其在器件中应用的关键，此前的研究重点一直是它们在涡旋平面内的动力学，而斯格明子弦的动力学控制仍是未知领域。在此，我们利用小角中子散射报告了在手性磁体MnSi中，三维斯格明子弦在正交热梯度下的有效弯曲。这种动力学行为是通过利用与温度相关的斯格明子霍尔效应实现的，这在斯格明子动力学框架中是意想不到的。因此，我们为磁振子摩擦的存在提供了实验证据，最近有人提出磁振子摩擦是捕捉斯格明子动力学的关键因素，这需要对蒂勒方程进行修正。我们的工作因此表明，在操控三维斯格明子时存在一个额外的自由度。
