无序多相斯格明子材料 Co8Zn8Mn4 中的斯格明子排列与钉扎效应
摘要
斯格明子材料中的本征无序既可抑制也可促进斯格明子重取向与拓扑变化。识别这些无序诱导的拓扑活跃区间对实现稳健的斯格明子自旋电子学应用至关重要，但针对无序块体样品的研究甚少。本文采用小角中子散射（SANS）与微磁模拟，考察无序多晶 CoZnMn 块体样品相空间中斯格明子有序度对斯格明子晶格形成、转变与重取向动力学的影响。我们的测量揭示了一条新的无序到有序斯格明子方晶格转变路径，其特征是 SANS 中四重有序的新颖增强，并伴随系统拓扑变化，微磁模拟进一步佐证了该过程。钉扎响应在亚稳三角晶格相中主导斯格明子动力学，通过一种显著且此前未检测到的斯格明子记忆效应增强斯格明子稳定性，该效应复现先前的有序过程并在零场下持续。这些结果揭示了各向异性与无序在斯格明子形成与重构动力学中的协同作用，为斯格明子调控建立了新的可调路径。
引用
@article{arxiv.2112.08669,
title = {Skyrmion Alignment and Pinning Effects in a Disordered Multi-Phase Skyrmion Material Co8Zn8Mn4},
author = {M. E. Henderson and M. Bleuel and J. Beare and D. G. Cory and B. Heacock and M. G. Huber and G. M. Luke and M. Pula and D. Sarenac and S. Sharma and E. M. Smith and K. Zhernenkov and D. A. Pushin},
journal= {arXiv preprint arXiv:2112.08669},
year = {2022}
}
备注
15 pages, 11 figures, Version 2 showing micromagnetic simulations that reinforce a new disordered-to-ordered square lattice skyrmion transition pathway which entails a change in topological charge. SANS simulations are included which estimate the change in the skyrmion lattice and ferromagnetic volume fractions from the metastable triangular lattice skyrmion phase to the skyrmion memory phase