Exploring moiré skyrmions in twisted double bilayer and double trilayerCrI3.

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER Journal of Physics: Condensed Matter Pub Date : 2024-12-04 DOI:10.1088/1361-648X/ad9536
Bilal Jabakhanji, Doried Ghader
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Abstract

Moiré magnets have emerged as intriguing platforms for hosting exotic magnetic states due to the competing interactions within these materials. Recent experiments have reported noncollinear magnetic states in moiréCrI3, particularly focusing on twisted double bilayer (tDB) and double trilayer (tDT) configurations. However, atomistic simulations of moiréCrI3have largely been limited to the bilayer case. Here, we use stochastic Landau-Lifshitz-Gilbert simulations to investigate skyrmion nucleation in tDB and tDTCrI3and to estimate the threshold Dzyaloshinskii-Moriya interaction (th-DMI) required for their stabilization. Our findings show that the th-DMI decreases significantly with reduced twist angles. Above this threshold, three skyrmions nucleate at the monoclinic regions of the moiré supercell, randomly distributing across the interfacial layers and imprinting onto adjacent layers. Additionally, a substrate-induced DMI further reduces the th-DMI without affecting skyrmion localization. These results suggest that small twist angles and substrate-induced DMI can facilitate skyrmion formation in moiré structures.

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探索扭曲双双层和双三层 CrI3 中的 Moiré Skyrmions。
由于摩尔磁体材料内部的竞争性相互作用,这些材料已成为承载奇异磁态的引人入胜的平台。最近的实验报告了摩尔纹 CrI3 中的非共轭磁态,尤其关注扭曲双双层(tDB)和双三层(tDT)构型。然而,摩尔纹 CrI3 的原子模拟在很大程度上仅限于双层情况。在这里,我们使用随机兰道-利夫希茨-吉尔伯特(sLLG)模拟来研究 tDB 和 tDT CrI3 中的天融核,并估算其稳定所需的 Dzyaloshinskii-Moriya 作用阈值(th-DMI)。我们的研究结果表明,th-DMI 随扭转角的减小而显著降低。在这一阈值之上,三个天粒在摩尔超胞的单斜区域成核,随机分布在界面层上,并印刻到相邻层上。此外,基底诱导的 DMI 会进一步降低 th-DMI 而不影响天融子的定位。这些结果表明,小扭转角和基底诱导的 DMI 可以促进摩尔纹 CrI3 结构中天融离子的形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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