Current-induced dynamics and tunable spectra of a magnetic chiral bobber
Current-induced dynamics and tunable spectra of a magnetic chiral bobber
复制标题
磁手性浮子的电流感应动力学和可调光谱
DOI：
10.1103/physrevb.104.l100412
复制
发表时间：
2021-09-17
影响因子：
3.7
通讯作者：
Cheng, Zhao-hua
中科院分区：
文献类型：
--
作者：
Gong, Zizhao;Tang, Jin;Cheng, Zhao-hua
手性跳波（ChB）是手性磁体中一种奇特的三维拓扑织构。它由一个Bloch-point奇点和一个skyrmion管组成；因此，这两个成分的不相称的特征长度尺度将导致ChB的新动力学。在这里，我们报道了电流感应运动和伴随的霍尔效应。令人惊讶的是，我们发现ChB的霍尔角可以在-90度到正角的广泛范围内调谐。对自旋波激发的进一步研究发现了高频共振模式，这与ChB的速度和晶格常数有关。激发态的频率可以比skyrmins高两个数量级。广泛的霍尔角和频谱范围可以促进使用拓扑结构的自旋电子器件的发展。
Chiral bobber (ChB) is an exotic three-dimensional topological texture in chiral magnets. It is composed of a Bloch-point singularity and a skyrmion tube; the incommensurate characteristic length scales of these two components would thus lead to novel dynamics of a ChB. Here, we report the current-induced motion and the accompanying Hall effect of a ChB. Surprisingly, we find that the Hall angle of a ChB can be tuned in a wide range from -90 degrees to positive angles. A further study of spin-wave excitations identified high-frequency resonant modes, which are related to the velocity of ChB and lattice constants. The excited frequency can be two orders of magnitude higher than that of skyrmions. The broad ranges of Hall angles and frequency spectra could boost the development of spintronic devices using topological textures.