Bifurcation of a Topological Skyrmion String
arXiv:2205.09258 · doi:10.1103/PhysRevB.105.214402
Abstract
Manipulation of three-dimensional (3D) topological objects is of both fundamental interest and practical importance in many branches of physics. Here, we show by spin dynamics simulations that the bifurcation of a 3D skyrmion string in a layered frustrated system could be induced by the dampinglike spin-orbit torque. The bifurcation of a skyrmion string happens when the skyrmion string carries a minimal topological charge of . We demonstrate that three types of bifurcations could be realized by applying different current injection geometries, which lead to the transformation from I-shaped skyrmion strings to Y-, X-, and O-shaped ones. Besides, different branches of a bifurcated skyrmion string may merge into an isolated skyrmion string spontaneously. The mechanism of bifurcation should be universal to any skyrmion strings with in the layered frustrated system and could offer a general approach to manipulate 3D stringlike topological objects for spintronic functions.
arXiv comment6 pages, 3 figures
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