AI 中文总结
研究突破霍普夫子仅能在低温存在的限制，在室温及以上的Co₈Zn₈Mn₄中生成稳定磁性霍普夫子，揭示其形成机制并为相关技术应用提供研究框架。
AI 中文摘要
霍普夫子是被预测存在于多种磁性体系中的三维拓扑孤子，但其实际应用大多局限于低温环境。本文通过在室温及以上温度的手性磁体Co₈Zn₈Mn₄中展示稳定的磁性霍普夫子，突破了这一温度限制。利用配备原位光激发功能的透射电子显微镜，我们通过飞秒激光脉冲生成磁性霍普夫子。长期观测进一步揭示了其在室温下的类布朗运动，以及在接近高温区间时的热激活坍缩现象。结合微磁模拟与同伦群分析，我们的实验观测揭示了霍普夫子通过双磁子对融合的形成机制。这些发现确立了室温磁性霍普夫子的存在，并为其在技术相关条件下的进一步研究提供了框架。
英文摘要
Hopfions are three-dimensional (3D) topological solitons predicted to exist in diverse magnetic systems, yet their practical utility has been largely restricted to cryogenic environments. Here, we overcome this temperature constraint by demonstrating stable magnetic hopfions in the chiral magnet Co8Zn8Mn4 at and above room temperature. Using a transmission electron microscope equipped for in situ optical excitation, we generate magnetic hopfions with femtosecond laser pulses. Long-term observations further reveal Brownian-like motion at room temperature and thermally activated collapse upon approaching the high-temperature regime. Together with micromagnetic simulations and homotopy group analysis, our experimental observations uncover the hopfion formation mechanism through the fusion of bimeron pairs. These findings establish room-temperature magnetic hopfions and provide a framework for their further studies under technologically relevant conditions.
Comments10 pages, 4 figures
