Formation and annihilation of multi-antiskyrmion defects during skyrmion nucleation

被引:5
作者
Han, L. [1 ]
Song, C. [1 ]
Pan, F. [1 ]
机构
[1] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, MOE, Beijing 100084, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
TEMPERATURE MAGNETIC SKYRMIONS; ROOM-TEMPERATURE; STABILITY; DYNAMICS;
D O I
10.1063/5.0027351
中图分类号
O59 [应用物理学];
学科分类号
摘要
Magnetic skyrmions and antiskyrmions are intriguing topological defects in spin textures. A single-antiskyrmion defect would form and collapse to straightforwardly complete the topological transition for the nucleation of a skyrmion phase from a ferromagnetic background. Here, a novel multi-antiskyrmion defects-driven skyrmion nucleation mechanism is investigated in both the ferromagnetic single layer and synthetic antiferromagnetic trilayers with the spin-polarized current stimuli. The multi-antiskyrmion defects mechanism needs lower nucleation activation energy than the single-antiskyrmion defect mechanism and brings about intriguing fluctuations in topological charge. The multi-antiskyrmion defects mechanism can survive even at room temperature and is robust against simulation parameters. Our finding not only unravels an unprecedented skyrmion nucleation process but also provides a platform for investigating antiskyrmions as topological defects during topological transition.
引用
收藏
页数:9
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