AI 中文总结
该研究提出从含涌现单极子-反单极子对的磁托隆生成霍普夫子的机制，经模拟表明电流可实现该转化，揭示了霍普夫子创建的实验可行途径及拓扑纹理生成路径。
AI 中文摘要
三维磁化成像技术的最新进展为探索畴壁和斯格明子之外的拓扑自旋纹理开辟了新途径。其中，磁性霍普夫子因其打结的拓扑结构有望产生非常规的动力学和响应而极具应用前景，但对其进行可控创建仍具挑战性。本文提出了一种从磁托隆（包含一对涌现单极子-反单极子的三维纹理）生成霍普夫子的简单机制。通过朗道-利夫希茨-吉尔伯特模拟，我们证明电流驱动该对的湮灭，将托隆转化为霍普夫子。初始托隆长度决定了生成霍普夫子的数量，而电流方向则选择霍普夫不变量的符号。我们进一步发现阈值电流对材料参数敏感，表明其与斯格明子动力学密切相关。我们的结果确立了一种实验可实现的霍普夫子创建途径，并揭示了从单极子缺陷到打结拓扑纹理的路径。
英文摘要
Recent advances in three-dimensional magnetization imaging techniques have opened new avenues for exploring topological spin textures beyond domain walls and skyrmions. Among them, magnetic hopfions are particularly promising, as their knotted topology is expected to give rise to unconventional dynamics and responses; however, their controlled creation remains challenging. Here we propose a simple mechanism for generating hopfions from magnetic torons, three-dimensional textures hosting an emergent monopole-antimonopole pair. Using Landau-Lifshitz-Gilbert simulations, we show that an electric current drives the annihilation of this pair, converting a toron into a hopfion. The initial toron length determines the number of generated hopfions, while the current direction selects the sign of the Hopf invariant. We further find that the threshold current depends sensitively on material parameters, indicating a close connection to skyrmion dynamics. Our results establish an experimentally accessible route to hopfion creation and reveal a pathway from monopole defects to knotted topological textures.
Comments9 pages, 5 figures
