发表机构
Xi’an Jiaotong-Liverpool University; Université de Strasbourg; University of Liverpool（西交利物浦大学; 斯特拉斯堡大学; 利物浦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究揭示交错磁体斯格明子中两个子晶格半径差产生的反对称呼吸模式，该模式在短场脉冲后以49.5 GHz频率与均匀螺旋度正交振荡，为操控斯格明子动力学提供新机制。
AI 中文摘要
具有d波对称性的交错磁体中的斯格明子由两个长轴相互垂直的椭圆子晶格纹理组成。对于每个子晶格分量η=A,B，我们定义有效斯格明子半径R_η=√(a_η b_η)，其中a_η和b_η分别是斯格明子中心到其边界沿y和x方向的距离。对于所研究的各向异性交换参数，零场下的平衡半径小于具有平行子晶格纹理且其他参数相同的参考体系中的半径。垂直于薄膜的磁场使一个子晶格斯格明子膨胀，而使另一个收缩，从而产生半径差δR=R_A-R_B和净磁矩。用于表示单轴应变的交换调制在零场下也产生非零的半径差。由于强和弱交换方向在两个子晶格之间互换，交换耦合的公共方向变化会使一个半径增大而另一个减小。与磁耦合不同，当两个子晶格交换张量变得相同时，该机制消失。半径差还支持反对称呼吸模式。在短场脉冲之后，它以与均匀螺旋度（薄膜平面内畴壁磁化的公共旋转）正交的方式振荡，对于参考参数，频率为49.5 GHz。
英文摘要
A skyrmion in an altermagnet with \(d\) wave symmetry consists of two elliptical sublattice textures with perpendicular long axes. For each sublattice component $η=A,B$, we define an effective skyrmion radius $R_η=\sqrt{a_ηb_η}$, where $a_η$ and $b_η$ are the distances from the skyrmion center to its boundary along $y$ and $x$, respectively. For the anisotropic exchange parameters studied, the equilibrium radius at zero field is smaller than in a reference with parallel sublattice textures and otherwise identical parameters. A magnetic field perpendicular to the film expands one sublattice skyrmion and contracts the other, generating a radius difference $\dR=R_A-R_B$ and a net magnetic moment. The exchange modulation used to represent uniaxial strain also produces a nonzero radius difference at zero field. Because the strong and weak exchange directions are interchanged between the two sublattices, a common directional change of the exchange couplings increases one radius and decreases the other. Unlike the magnetic coupling, this mechanism vanishes when the two sublattice exchange tensors become identical. The radius difference also supports an antisymmetric breathing mode. After a short field pulse, it oscillates in quadrature with the uniform helicity, the common rotation of the wall magnetization within the film plane, at \(49.5\,\mathrm{GHz}\) for the reference parameters.
