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arXiv 2302.01074cond-mat.mtrl-sciquant-ph
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在莫尔磁性异质结构中设计层状二维斯格明子晶格

Designing layered 2D skyrmion lattices in moiré magnetic hetero-structures

Bilal Jabakhanji, Doried Ghader

AI总结:

本文理论研究扭转 CrBr_3/CrI_3 莫尔磁性异质结构,利用界面 DMI 与手性层间场在零磁场下构建层状铁磁及反铁磁斯格明子晶格。

摘要:

斯格明子有望用于下一代自旋电子和磁振子器件,但其零场稳定性以及通过手性相互作用实现可控成核仍具挑战性。在这项理论研究中,我们探究了莫尔磁性异质结构凭借二维磁体中依赖堆叠方式的磁性来生成有序斯格明子晶格的潜力。我们考虑由超薄 CrBr_3 薄膜扭转堆叠于 CrI_3 衬底之上形成的异质结构,并假定存在中等强度的界面 Dzyaloshinskii–Moriya 相互作用。在较大的莫尔周期和适当的衬底厚度下,由于 CrBr_3 的交换相互作用弱于 CrI_3,界面 CrBr_3 层中会出现莫尔斯格明子晶格。随后,该晶格通过涌现的手性层间场投射到 CrBr_3 薄膜的其余各层。通过改变超薄 CrBr_3 薄膜内的原始堆叠构型,我们无需永久磁场即可实现层状铁磁和反铁磁斯格明子晶格。研究结果表明,在莫尔磁性异质结构中创建丰富多彩的斯格明子晶格是可能的,从而有助于进一步探索其基本性质和技术意义。

英文摘要:

Skyrmions are promising for the next generation of spintronic and magnonic devices, but their zero-field stability and controlled nucleation through chiral interactions remain challenging. In this theoretical study, we explore the potential of moiré magnetic heterostructures to generate ordered skyrmion lattices from the stacking-dependent magnetism in 2D magnets. We consider heterostructures formed by twisting ultrathin CrBr_3 films on top of CrI_3 substrates, assuming a moderate interfacial Dzyaloshinskii-Moriya interaction. At large moiré periodicity and appropriate substrate thickness, a moiré skyrmion lattice emerges in the interfacial CrBr_3 layer due to the weaker exchange interactions in CrBr_3 compared to CrI_3. This lattice is then projected to the remaining layers of the CrBr_3 film via emergent chiral interlayer fields. By varying the pristine stacking configurations within the ultrathin CrBr_3 film, we realize layered ferromagnetic and antiferromagnetic skyrmion lattices without the need for a permanent magnetic field. Our findings suggest the possibility of creating colorful skyrmion lattices in moiré magnetic heterostructures, enabling further exploration of their fundamental properties and technological relevance.

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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