拓扑磁相变的免涨落路径
材料科学
2025-12-30 v1
摘要
拓扑磁结构是由竞争性相互作用稳定的类粒子自旋构型。其形成通常归因于涨落驱动的一阶成核过程，需要越过拓扑能垒进行激活。在此，我们展示了一种替代性的无能垒、免涨落的拓扑磁结构成核路径，在我们的实验中由激发诱导的自旋重取向转变触发。通过结合 X 射线成像、散射和微磁学模拟，我们表明系统在激发后遵循确定性的对称性破缺相变级联。首先，系统从均匀态经历二阶相变形成弱条纹畴，然后经历一阶相变形成拓扑平庸的气泡，最后发生拓扑切换事件进入 skyrmionic 结构。通过模拟，我们推广了我们的发现并证明该路径在广泛的低各向异性材料中是活跃的。这一此前未被认识到的自发转变路径为快速、低能耗地生成拓扑自旋结构提供了策略，并揭示了内在调制不稳定性在超越磁学的相变中的一般性作用。
引用
@article{arxiv.2512.22947,
title = {A fluctuation-free pathway for a topological magnetic phase transition},
author = {Riccardo Battistelli and Lukas Körber and Kai Litzius and Matthieu Grelier and Krishnanjana Puzhekadavil Joy and Michael Schneider and Steffen Wittrock and Daniel Metternich and Tamer Karaman and Lisa-Marie Kern and Christopher Klose and Simone Finizio and Josefin Fuchs and Christian M. Günther and Tim A. Butcher and Karel Prokeš and Raluca Boltje and Manas Patra and Sebastian Wintz and Markus Weigand and Sascha Petz and Horia Popescu and Jörg Raabe and Nicolas Jaouen and Stefan Eisebitt and Vincent Cros and Bastian Pfau and Johan H. Mentink and Nicolas Reyren and Felix Büttner},
journal= {arXiv preprint arXiv:2512.22947},
year = {2025}
}
备注
44 pages, 19 figures (of which 5 figures are in main text, 4 in Supplementary Information and 10 are Extended Data Figures). The raw data, source data and analysis code for all figures are available at https://zenodo.org/doi/10.5281/zenodo.18004538