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arXiv 2603.28136cond-mat.mtrl-sci
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利用洛伦兹透射电镜和电子全息术量化范德瓦耳斯异质结构中的磁相互作用

Quantification of magnetic interactions in van der Waals heterostructures using Lorentz transmission electron microscopy and electron holography

Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich(尤利希研究中心恩斯特·鲁斯卡电子显微镜与谱学中心);Peter Grünberg Institute, Forschungszentrum Jülich(尤利希研究中心彼得·格林贝格研究所);Department of Inorganic Chemistry, University of Chemistry and Technology Prague(布拉格化学技术大学无机化学系)

Joachim Dahl Thomsen, Qianqian Lan, Nikolai S. Kiselev, Eva Duft, Arslan Rehmat, Zdeněk Sofer, Rafal E. Dunin-Borkowski

AI总结:

研究通过洛伦兹透射电镜和电子全息术量化Fe3GeTe2/石墨/Fe3GeTe2异质结构中的磁相互作用,发现磁域对齐随FGT分离增加而减弱,确定了磁偶极耦合长度尺度为34±4nm,并揭示了表面效应和磁域壁特性。

摘要:

磁性范德瓦耳斯(vdW)材料因其高度可调的磁性特性和与vdW异质结构器件的兼容性,具有在存储和逻辑应用中的潜力。然而,在传统面视测量中,堆叠层间的磁纹理耦合难以分辨,因为磁信号在样品厚度上被积分。在此,利用交叉截面洛伦兹透射电镜和电子全息术对Fe3GeTe2(FGT)/石墨/FGT异质结构中的相互作用进行了量化,使能够重建层内和层间局部磁场。磁域对齐随FGT分离增加而减弱,产生一个磁偶极耦合长度尺度为λ=34±4nm,对应于磁域错位首次出现的平均分离。该长度尺度与相对于本征FGT的层间磁场约减少50%一致。表面效应导致磁矩远离容易轴远离表面约100nm。最后,磁域壁狭窄(约9nm),而微磁模拟能够再现观测到的纹理,而无需引入Dzyaloshinskii-Moriya相互作用。这些结果量化了堆叠vdW磁体的内部和 stray 磁场,并指导了需要可控磁纹理耦合的器件设计。

英文摘要:

Magnetic van der Waals (vdW) materials are promising for memory and logic applications because of their highly tunable magnetic properties and compatibility with vdW heterostructure devices. However, coupling between magnetic textures in stacked layers is difficult to resolve in conventional plan-view measurements because the magnetic signal is integrated over the sample thickness. Here, these interactions are quantified in Fe$_3$GeTe$_2$ (FGT)/graphite/FGT heterostructures using cross-sectional Lorentz transmission electron microscopy and off-axis electron holography, enabling reconstruction of the local magnetic induction within and between the layers. Domain alignment weakens with increasing FGT separation, yielding a stray-field coupling length scale of $λ= 37 \pm 7$ nm for the cross-sectional geometry studied here, corresponding to the average separation at which domain misalignment first emerges. This length scale corresponds to an approximately 23% reduction in the interlayer magnetic induction relative to bulk FGT. Surface effects result in a reduced magnetic induction compared to bulk FGT up to $\sim$100 nm from a surface. Comparisons of experimental data with model-based iterative reconstructions of the magnetization and micromagnetic simulations shows that the reduction in induction near surfaces is due to demagnetizing and stray fields. These results quantify the magnetic induction in stacked vdW magnets and guide the design of devices that require controllable coupling between magnetic textures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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