Evidence of non-collinear spin texture in magnetic moiré superlattices

Xie, Hongchao; Luo, Xinyao; Ye, Zhipeng; Sun, Zeyuan; Ye, Gaihua; Sung, Suk Hyun; Ge, Haiwen; Yan, Shaohua; Yang, Fu; Tian, Shangjie; Lei, Hechang; Sun, Kai; Hovden, Robert; He, Rui; Zhao, Liuyan

doi:10.1038/s41567-023-02061-z

Cited by 25 publications

(29 citation statements)

References 39 publications

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“…However, extending this approach to XY -type easy-plane magnets holds tremendous intrigue, as it enables exploration of captivating phenomena such as the Berezinskii–Kosterlitz–Thouless transition, , the emergence of merons, , and the potential discovery of hidden magnetic phases driven by strong spin fluctuations . The recent discovery of twisted magnets further enhances the allure, prompting a continued investigation into the captivating moiré effects in these systems. − …”

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confidence: 99%

“…In this study, we investigate twist engineering in vdW magnets as a promising avenue to realize stable merons. By conducting atomistic spin simulations, we demonstrate that antiferromagnetic domain arrays in the twisted magnet ,,− can be utilized to localize the cores of merons along the boundaries of their respective domains (Figure a–b). This localization mechanism effectively preserves the stable spin configuration of the Meron pair by separating their cores (Figure c).…”

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confidence: 99%

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Emergence of Stable Meron Quartets in Twisted Magnets

Kim,

Go,

Park

et al. 2023

Nano Lett.

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The investigation of twist engineering in easy-axis magnetic systems has revealed remarkable potential for generating topological spin textures. Implementing twist engineering in easyplane magnets, we introduce a novel approach to achieving fractional topological spin textures, such as merons. Through atomistic spin simulations on twisted bilayer magnets, we demonstrate the formation of a stable double Meron pair, which we refer to as the "Meron Quartet" (MQ). Unlike a single pair, the merons within the MQ exhibit exceptional stability against pair annihilation due to the protective localization mechanism induced by the twist that prevents collision of the Meron cores. Furthermore, we showcase that the stability of the MQ can be enhanced by adjusting the twist angle, resulting in an increased resistance to external perturbations such as external magnetic fields. Our findings highlight the twisted magnet as a promising platform for achieving merons as stable magnetic quasiparticles in van der Waals magnets.

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Emergence of Stable Meron Quartets in Twisted Magnets

Kim,

Go,

Park

et al. 2023

Nano Lett.

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Section: Stacking Order Engineering Enabled By Interlayer Twistmentioning

confidence: 99%

Stacking Order Engineering of Two-Dimensional Materials and Device Applications

Fox,

Mao,

Zhang

et al. 2023

Chem. Rev.

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Stacking orders in 2D van der Waals (vdW) materials dictate the relative sliding (lateral displacement) and twisting (rotation) between atomically thin layers. By altering the stacking order, many new ferroic, strongly correlated and topological orderings emerge with exotic electrical, optical and magnetic properties. Thanks to the weak vdW interlayer bonding, such highly flexible and energy-efficient stacking order engineering has transformed the design of quantum properties in 2D vdW materials, unleashing the potential for miniaturized high-performance device applications in electronics, spintronics, photonics, and surface chemistry. This Review provides a comprehensive overview of stacking order engineering in 2D vdW materials and their device applications, ranging from the typical fabrication and characterization methods to the novel physical properties and the emergent slidetronics and twistronics device prototyping. The main emphasis is on the critical role of stacking orders affecting the interlayer charge transfer, orbital coupling and flat band formation for the design of innovative materials with on-demand quantum properties and surface potentials. By demonstrating a correlation between the stacking configurations and device functionality, we highlight their implications for next-generation electronic, photonic and chemical energy conversion devices. We conclude with our perspective of this exciting field including challenges and opportunities for future stacking order engineering research.

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“…Numerous subsequent experiments and theories substantiated that this intriguing difference comes from the change of the interlayer magnetic order caused by the different stacking order in CrI 3 and CrCl 3 . − Specifically, the CrI 3 crystal undergoes a transition from the monoclinic (M) phase to rhombohedral (R) phase below room temperature − and exhibits interlayer FM coupling at low temperature, while exfoliated thin layers of CrI 3 maintain the monoclinic phase at low temperatures, which manifests as interlayer AFM coupling. This promotes extensive development of external control of magnetism ,,− and particularly moiré magnetism, − which may exhibit novel phenomena that were once unimaginable. Surprisingly, as an isostructural material, both bulk and exfoliated CrBr 3 flakes have been demonstrated and widely used as perfect ferromagnetic semiconductors. − The remaining questions are (1) what is the essential difference between CrBr 3 and CrI 3 (CrCl 3 ) and (2) is there an effective method to control the magnetic order of CrBr 3 , which may provide us a platform to explore new physical phases and related magnetic devices?…”

Section: Introductionmentioning

confidence: 99%

Controlling the 2D Magnetism of CrBr₃ by van der Waals Stacking Engineering

Yang,

Xu,

Han

et al. 2023

J. Am. Chem. Soc.

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Evidence of non-collinear spin texture in magnetic moiré superlattices

Cited by 25 publications

References 39 publications

Emergence of Stable Meron Quartets in Twisted Magnets

Emergence of Stable Meron Quartets in Twisted Magnets

Stacking Order Engineering of Two-Dimensional Materials and Device Applications

Controlling the 2D Magnetism of CrBr₃ by van der Waals Stacking Engineering

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Evidence of non-collinear spin texture in magnetic moiré superlattices

Cited by 25 publications

References 39 publications

Emergence of Stable Meron Quartets in Twisted Magnets

Emergence of Stable Meron Quartets in Twisted Magnets

Stacking Order Engineering of Two-Dimensional Materials and Device Applications

Controlling the 2D Magnetism of CrBr3 by van der Waals Stacking Engineering

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Controlling the 2D Magnetism of CrBr₃ by van der Waals Stacking Engineering