Domain Wall Formation and Magnon Localization in Twisted Chromium Trihalides

Soriano, David

doi:10.1002/pssr.202200078

Cited by 6 publications

(3 citation statements)

References 51 publications

(88 reference statements)

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“…These topological phases induce chiral magnetic fields and could introduce new intriguing observations and functionality to the previously proposed spintronic devices. With their remarkable periodicity compared to DMI-induced skyrmions, these lattices could offer exciting platforms for the ongoing research on moiré magnons [73][74][75][76][77][78] and skyrmion-based magnonics.…”

Section: Discussionmentioning

confidence: 99%

Designing Layered 2D Skyrmion Lattices in Moiré Magnetic Heterostructures

Jabakhanji,

Ghader

2023

Adv Materials Inter

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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, the potential of moiré magnetic heterostructures to generate ordered skyrmion lattices from the stacking‐dependent magnetism in 2D magnets is explored. Heterostructures formed by twisting ultrathin CrBr3 films on top of CrI3 substrates are considered, assuming a moderate interfacial Dzyaloshinskii–Moriya interaction. At large moiré periodicity and appropriate substrate thickness, a moiré skyrmion lattice emerges in the interfacial CrBr3 layer due to the weaker exchange interactions in CrBr3 compared to CrI3. This lattice is then projected to the remaining layers of the CrBr3 film via chiral interlayer exchange fields. By varying the pristine stacking configurations within the ultrathin CrBr3 film, layered ferromagnetic and antiferromagnetic skyrmion lattices without the need for a permanent magnetic field are realized. These findings suggest the possibility of creating ordered skyrmion lattices in moiré magnetic heterostructures, enabling further exploration of their fundamental properties and technological relevance.

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Section: Discussionmentioning

confidence: 99%

Designing Layered 2D Skyrmion Lattices in Moiré Magnetic Heterostructures

Jabakhanji,

Ghader

2023

Adv Materials Inter

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“…This substrate-mediated RKKY interaction depends on the local stacking between CrBr 3 and HOPG, which in turn is controlled by the moiré modulation between HOPG and CrBr 3 . This modulation in real space leads to the change of the exchange constants J ij ,,− and, in turn, the spin stiffness through the moiré unit cell. − Moreover, potential small structural distortions lead to a modulation of the superexchange interaction, both of which follow the same periodicity as the moiré pattern. Holstein–Primakoff mapping allows the magnonic Hamiltonian to be written in terms of the bosonic magnon operators scriptH = prefix− ∑ i j γ i j a i † a j + ∑ n Δ n a n † a n + normalh.c. with γ ij ∼ J ij controlling the spin stiffness and ⟨Δ n ⟩ determines the magnon gap, and a n † , a n are the creation and annhilation magnon operators.…”

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confidence: 99%

Visualization of Moiré Magnons in Monolayer Ferromagnet

et al. 2023

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Two-dimensional magnetic materials provide an ideal platform to explore collective many-body excitations associated with spin fluctuations. In particular, it should be feasible to explore, manipulate, and ultimately design magnonic excitations in two-dimensional van der Waals magnets in a controllable way. Here we demonstrate the emergence of moiré magnon excitations, stemming from the interplay of spin-excitations in monolayer CrBr3 and the moiré pattern arising from the lattice mismatch with the underlying substrate. The existence of moiré magnons is further confirmed via inelastic quasiparticle interference, showing the appearance of a dispersion pattern correlated with the moiré length scale. Our results provide a direct visualization in real-space of the dispersion of moiré magnons, demonstrating the versatility of moiré patterns in creating emergent many-body excitations.

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“…The magnetic state of a CrI 3 bilayer can be tuned by electric field [15][16][17][18], external pressure [19][20][21][22], and charge doping [23][24][25]. Theoretical studies have predicted that it also depends on the stacking structure [26][27][28], and a twisting may bring periodic magnetization domains with complex spin texture [29][30][31]; additional Dzyaloshinskii-Moriya (DM) interactions may further stabilize various magnetic skyrmions [32][33][34][35]. Compared with magnetic skyrmions in alloys [36][37][38], the magnetic skyrmions in TBCIs are much thinner, they reach the two-dimensional limit, and open up the field of spintwistronics [39].…”

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confidence: 99%

Prediction of Magnetic Skyrmions in A New Kind of Twisted Bilayer CrI$_3$

Zheng¹

2022

Preprint

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Magnetic skyrmions are topologically protected spin swirling vertices, which are promising in device applications due to their particle-like nature and excellent controlability. Magnetic skyrmions have been extensively studied in a variaty of materials, and were proposed to exist in the extreme two-dimensional limit, i.e., in twisted bilayer CrI3 (TBCI). Unfortunately, the magnetic states of TBCIs with small twist angles are disorderly distributed ferromagnetic (FM) and antiferromagnetic (AFM) domains in previous experiments, and thus the method to get rid of disorders in TBCIs is highly desirable. Here we propose the functions of interlayer exchange interactions obtained using first-principles calculations and stored in symmetry-adapted artificial neural networks. Based on them, the subsequent Landau-Lifshitz-Gillbert equation calculations explain the disorderly distributed FM-AFM domains in TBCIs with small twist angles and predict the orderly distributed skyrmions in TBCIs with large twist angles, which can be used in both spintronics and fundamental research.Since the successful construction of twisted bilayer graphene[1, 2], rich properties of twisted bilayer systems have been demonstrated, such as 1

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Domain Wall Formation and Magnon Localization in Twisted Chromium Trihalides

Cited by 6 publications

References 51 publications

Designing Layered 2D Skyrmion Lattices in Moiré Magnetic Heterostructures

Designing Layered 2D Skyrmion Lattices in Moiré Magnetic Heterostructures

Visualization of Moiré Magnons in Monolayer Ferromagnet

Prediction of Magnetic Skyrmions in A New Kind of Twisted Bilayer CrI$_3$

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