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Controllable Topological Magnetic Transformations in the Thickness-Tunable van der Waals Ferromagnet Fe5GeTe2
ACS Nano ( IF 15.8 ) Pub Date : 2022-11-09 , DOI: 10.1021/acsnano.2c08844
Xiaowei Lv 1 , Ke Pei 1 , Chendi Yang 1 , Gang Qin 1 , Min Liu 1 , Jincang Zhang 2 , Renchao Che 1, 2
Affiliation  

Recent observations of topological meron textures in two-dimensional (2D) van der Waals (vdW) magnetic materials have attracted considerable research interest for both fundamental physics and spintronic applications. However, manipulating the meron textures and realizing the topological transformations, which allow for exploring emergent electromagnetic behaviors, remain largely unexplored in 2D magnets. In this work, utilizing real-space imaging and micromagnetic simulations, we reveal temperature- and thickness-dependent topological magnetic transformations among domain walls, meron textures, and stripe domain in Fe5GeTe2 (FGT) lamellae. The key mechanism of the magnetic transformations can be attributed to the temperature-induced change of exchange stiffness constant within layers and uniaxial magnetic anisotropy, while the magnetic dipole interaction as governed by sample thickness is crucial to affect the critical transformation temperature and stripe period. Our findings provide reliable insights into the origin and manipulation of topological spin textures in 2D vdW ferromagnets.

中文翻译:

厚度可调的范德瓦尔斯铁磁体 Fe5GeTe2 中的可控拓扑磁变换

最近对二维 (2D) 范德瓦尔斯 (vdW) 磁性材料中的拓扑 meron 结构的观察引起了对基础物理学和自旋电子学应用的相当大的研究兴趣。然而,操纵 meron 纹理和实现拓扑变换(允许探索紧急电磁行为)在 2D 磁体中仍然很大程度上未被探索。在这项工作中,我们利用真实空间成像和微磁模拟,揭示了 Fe 5 GeTe 2中畴壁、meron 结构和条纹畴之间与温度和厚度相关的拓扑磁转变(FGT) 薄片。磁转变的关键机制可归因于层内交换刚度常数的温度变化和单轴磁各向异性,而受样品厚度控制的磁偶极子相互作用对于影响临界转变温度和条纹周期至关重要。我们的发现为 2D vdW 铁磁体中拓扑自旋纹理的起源和操纵提供了可靠的见解。
更新日期:2022-11-09
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