Strain-tunable ferromagnetism and chiral spin textures in two-dimensional Janus chromium dichalcogenides

Cui, Qirui; Liang, Jinghua; Shao, Zongping; Cui, Ping; Yang, Haolin

doi:10.1103/physrevb.102.094425

Cited by 106 publications

(96 citation statements)

References 52 publications

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“…Herein, the increase of |d/J| in Cr 2 X 3 Y 3 is mainly due to the increase of |d| and decrease of |J| with tensile strain. We notice that skyrmions are observed in previous work 26,46 with |d/J| in the range of 0.1-0.…”

Section: S1 (Supplementary Material)supporting

confidence: 48%

“…To obtain the DMI strength, the chirality-dependent total energy difference approach 26,[40][41][42] is used, which has been successfully employed for DMI calculation in frustrated bulk systems and insulating chiral-lattice magnets as well as in 2D Janus material 42 . We take a…”

Section: B Dzyaloshinskii-moriya Interaction and Micromagnetic Dmi Co...mentioning

confidence: 99%

“…4(b) we investigate the atom-resolved MAE as functions of biaxial strain. The most significant contribution to MAE comes from the heavier non-magnetic atom I, which is similar to CrXTe (X = S, Se) system 26 . In addition, we further calculate the orbit-resolved MAE of the p orbits of I atom in Cr 2 I 3 Cl 3 with strain of 0% [Fig.…”

Section: S1 (Supplementary Material)mentioning

confidence: 99%

“…Recently, a class of Janus materials with inherent broken spatial inversion symmetry has been reported to have strong SOC 25,26 and large DMI that can stabilize skyrmions 27,28 .…”

Section: Introductionmentioning

confidence: 99%

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Strain tunable skyrmions and strong Dzyaloshinskii-Moriya interaction in two-dimensional Janus Cr(X,Y)$_{3}$ trihalides monolayers

Zhong¹,

Song²,

Xue³

et al. 2021

Preprint

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Recently, great effort has been poured into sorting out two-dimensional (2D) ferromagnetic materials with inherent strong Dzyaloshinskii-Moriya interaction (DMI).Here, with first-principles approach, we systematically investigate the effect of biaxial strain on DMI and skyrmions in Janus Cr 2 X 3 Y 3 (X, Y = Cl, Br, I, X = Y) monolayers. A large DMI/exchange coupling ratio |d/J| reaches or even exceeds 1, suggesting that the DMI is comparable to the Heisenberg exchange interaction, which is beneficial to the creation and stability of skyrmions. We find that DMI is mainly associated with the large spin-orbit coupling of heavier nonmagnetic halogen atoms rather than that of magnetic Cr atoms. Additionally, DMI and magnetic anisotropy energy (MAE) can be significantly enhanced by tensile strain. Interestingly, a reversal of the chirality of DMI in Cr 2 Cl 3 Br 3 and a switch of MAE from off-plane to in-plane in Cr 2 I 3 Cl 3 are induced by a compressive strain of 2%. Besides, pure skyrmions with diameter less than 10 nm can be modulated by biaxial strain. Our work has guiding significance for the research of DMI and skyrmions in 2D Janus materials as well as the potential applications in spintronic device.

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Section: S1 (Supplementary Material)supporting

confidence: 48%

Section: B Dzyaloshinskii-moriya Interaction and Micromagnetic Dmi Co...mentioning

confidence: 99%

Section: S1 (Supplementary Material)mentioning

confidence: 99%

“…Recently, a class of Janus materials with inherent broken spatial inversion symmetry has been reported to have strong SOC 25,26 and large DMI that can stabilize skyrmions 27,28 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strain tunable skyrmions and strong Dzyaloshinskii-Moriya interaction in two-dimensional Janus Cr(X,Y)$_{3}$ trihalides monolayers

Zhong¹,

Song²,

Xue³

et al. 2021

Preprint

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“…Experimental research has already reported TSTs in 2D layered magnetic materials and heterostructures [41][42][43][44] . Parallel to the experimental investigations, intensive theoretical efforts have predicted TSTs in chiral 2D magnets, including Janus monolayers [45][46][47] , multiferroics [48][49][50] , and monolayers with in-plane magnetic order 51,52 . Furthermore, 2D magnets offer unique opportunities to engineer TSTs via the modulated interlayer coupling in the moiré superlattices of twisted or mismatched bilayers.…”

Section: Introductionmentioning

confidence: 99%

Whirling interlayer fields as a new source of stable topological order in moiré CrI3

Ghader¹,

Jabakhanji²,

Stroppa³

2021

Preprint

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The moiré engineering of two-dimensional magnets opens unprecedented opportunities to design novel magnetic states via the stacking-dependent magnetism. Here, we explore the formation and control of ground state topological spin structures (TSTs) in moiré CrI3 without including the nearest-neighbor (NN) Dzyaloshinskii-Moriya interactions (DMI) and dipolar interactions in the theoretical approach. Using stochastic Landau-Lifshitz-Gilbert simulations, we unveil the emergence of vortex and antivortex interlayer exchange fields at large moiré periodicity. The whirling fields stabilize spontaneous and field-assisted ground state TSTs with various topologies, including skyrmionic clusters with high topological charges. Furthermore, by examining the effect of the Kitaev interaction and the next NN DMI, we propose the latter as the unique spin-orbit coupling mechanism compatible with the experimental results on monolayer and twisted CrI3. Therefore, our study goes beyond the current knowledge about TSTs in moiré magnets, opens exciting opportunities for moiré skyrmionics, and uncovers the spin-orbit coupling in CrI3.

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Manipulation of Magnetic Skyrmion in a 2D van der Waals Heterostructure via Both Electric and Magnetic Fields

Sun

Wang

Zang

et al. 2021

Adv Funct Materials

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As a promising candidate for the much-desired low power consumption spintronic devices, 2D magnetic van der Waals material also provides a versatile platform for the design and control of topological spin textures. In this work on WTe 2 /CrCl 3 bilayer van der Waals heterostructures, a complete Néel-type skyrmion-bimeron-ferromagnet phase transition is demonstrated, accompanied by the evolution of the topological number. This cyclic transition, mediated by a perpendicular magnetic field, is largely driven by the competition between the out-of-plane magnetocrystalline anisotropy and magnetic dipole-dipole interaction. In the presence of a driving current, the Néel-type skyrmion gains a higher velocity yet larger skyrmion Hall angle, in comparison to the bimeron. By incorporating a ferroelectric CuInP 2 S 6 monolayer as a substrate, writing and erasing of skyrmions may be regulated using a ferroelectric polarization. This work sheds light on a novel approach to the design and control of magnetic skyrmions on 2D van der Waals materials.

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Strain-tunable ferromagnetism and chiral spin textures in two-dimensional Janus chromium dichalcogenides

Cited by 106 publications

References 52 publications

Strain tunable skyrmions and strong Dzyaloshinskii-Moriya interaction in two-dimensional Janus Cr(X,Y)$_{3}$ trihalides monolayers

Strain tunable skyrmions and strong Dzyaloshinskii-Moriya interaction in two-dimensional Janus Cr(X,Y)$_{3}$ trihalides monolayers

Whirling interlayer fields as a new source of stable topological order in moiré CrI3

Manipulation of Magnetic Skyrmion in a 2D van der Waals Heterostructure via Both Electric and Magnetic Fields

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