Spirals and skyrmions in antiferromagnetic triangular lattices

Fang, Wuzhang; Raeliarijaona, Aldo; Chang, Po-Hao; Kovalev, Alexey A.; Belashchenko, Kirill D.

doi:10.1103/physrevmaterials.5.054401

Cited by 24 publications

(16 citation statements)

References 56 publications

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“…Another example is a bilayer structure system where the sign of the DM interaction is opposite for the different two layers [103][104][105][106]. Although the above lattice structures with the sublattice degree of freedom have attracted great interest owing to the findings of an antiferromagnetic (AFM) SkX [107][108][109][110][111][112] and intriguing dynamics [113][114][115][116][117][118][119], the effect of the sublattice-dependent DM interaction on the stabilization of the SkX has not been fully clarified yet [120,121].…”

Section: Introductionmentioning

confidence: 99%

Skyrmion crystal and spiral phases in centrosymmetric bilayer magnets with staggered Dzyaloshinskii-Moriya interaction

Hayami

2021

Preprint

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We theoretically study a stabilization mechanism of the skyrmion crystal in centrosymmetric magnets with a bilayer structure. We show that the interplay between a layer-dependent staggered Dzyaloshinskii-Moriya interaction that arises from the absence of local inversion symmetry and the interlayer exchange interaction gives rise to a plethora of multiple-Q states including the skyrmion crystal with a quantized topological number. By performing the simulated annealing for the bilayer triangular-lattice model under an external magnetic field, we demonstrate that the skyrmion forms the triangular-shaped crystals with different helicities in each layer owing to the staggered Dzyaloshinskii-Moriya interaction. Although the relative positions of the skyrmion core in each layer are different depending on the sign of the interlayer exchange interactions, the skyrmion crystal phases robustly appear under both ferromagnetic and antiferromagnetic interlayer interactions. We also find another two triple-Q states with a uniform scalar chirality but without a quantized topological number in the low-and high-field regions. Especially, the low-field triple-Q state exhibits the opposite sign of the scalar chirality to the skyrmion crystal, which are not found in the single-layer system. Our results indicate that the lack of local inversion symmetry in the lattice structure is another key ingredient to induce topological spin textures in centrosymmetric magnets.

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Section: Introductionmentioning

confidence: 99%

Skyrmion crystal and spiral phases in centrosymmetric bilayer magnets with staggered Dzyaloshinskii-Moriya interaction

Hayami

2021

Preprint

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“…We believe that our findings can be relevant and useful in synthesizing various experimental realizations of AFM skyrmion lattice using materials engineering ap-proach. Recently, possibilities of integrating transition metal dichalcogenides with magnetic transition metals to realize AFM triangular lattices capable of hosting such a skyrmion lattice have been explored and several potential candidates, such as Cr/MoS 2 , Fe/MoS 2 , and Fe/WSe 2 , have been proposed [29]. Knowledge of effects of different parameters on the skyrmion lattice existence and stability are essential in their fine-tuning to stabilize the skyrmion phase under experimentally feasible or technologically favourable conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The connection between the skyrmions in the AFM triangular Heisenberg lattice with the DMI and Z 2 vortices in the model without it was pointed out by Osorio et al [28]. A very recent report by Fang et al [29] suggests that such a skyrmion lattice can be realized in the presence of experimentally feasible external magnetic fields in interfaces integrating transition metal dichalcogenides with magnetic transition metals, such as Fe/MoS 2 .…”

Section: Introductionmentioning

confidence: 89%

Stability of skyrmion crystal phase in antiferromagnetic triangular lattice with DMI and single-ion anisotropy

Mohylna,

Žukovič

2021

Preprint

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We study a frustrated antiferromagnetic Heisenberg model on a triangular lattice with the Dzyaloshinskii-Moriya interaction (DMI) in the presence of an external magnetic field and a single-ion anisotropy. Phase diagrams in the temperature-field plane for both easy-axis and easy-plane anisotropy of a varying strength are constructed in the regimes of a moderate and strong DMI by parallel tempering Monte Carlo simulations. For the considered range of parameters the phase diagrams featuring up to four ordered phases are identified. A skyrmion lattice (SkX) phase is found to be stabilized within some temperature and field window for sufficiently large DMI and not too strong anisotropy. For the systems with moderate (larger) DMI, a small easy-plane (easy-axis) anisotropy is concluded to be beneficial by extending (shifting) the field window of the SkX appearance to lower values. The Metropolis dynamics is employed to probe the persistence of SkX upon quenching the field to zero or small finite values. The most favorable conditions for the skyrmions persistence are confirmed at low temperatures, small DMI and small easy-plane anisotropy values.

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“…One of the typical mechanisms that can lead to the stabilisation of skyrmions of both Neél and Bloch types is the Dzyaloshinskii-Moriya interaction (DMI) [10,11], which breaks the inversion symmetry in the system. Several studies have focused on the frustrated AFM triangular Heisenberg magnet with the presence of DMI [12][13][14][15][16]. Rosales et al and Osorio et al by means of both Monte Carlo (MC) simulations and low-energy effective action method demonstrated, that the for a moderate strength of the DMI in such model the SkX phase is stabilised in a quite wide temperaturefield range [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Rosales et al and Osorio et al by means of both Monte Carlo (MC) simulations and low-energy effective action method demonstrated, that the for a moderate strength of the DMI in such model the SkX phase is stabilised in a quite wide temperaturefield range [12,13]. Following works investigated the evolution of the phase diagram topology of such model with varying DMI strength [14] and the presence of single-ion anisotropy [15,16]. It was shown, that the increase of the DMI as well as the presence of small in-plane and out-of-plane anisotropy can to some extent widen/shrink or shift the SkX phase area both in field and temperature parameter ranges.…”

Section: Introductionmentioning

confidence: 99%

Road to zero-field antiferromagnetic skyrmions in a frustrated AFM/FM heterostructure

Mohylna,

Tkachenko,

Žukovič

2022

Preprint

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We demonstrate a mechanism of significant reduction, including complete elimination, of the external magnetic field required for the stabilization of a skyrmion lattice (SkX) phase in a frustrated triangular Heisenberg antiferromagnet (AFM) with the Dzyaloshinskii-Moriya interaction. It is achieved by coupling of such a AFM plane to a reference ferromagnetic (FM) layer, which generates an effective field cooperating with the external magnetic field. If the FM layer shows some axial single-ion anisotropy then the effective field can also be generated in zero external field due to a spontaneous FM long-range ordering. Then a sufficiently large interlayer coupling can fully substitute the external magnetic field and the SkX phase in the AFM layer can be stabilized even in zero external field.

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Spirals and skyrmions in antiferromagnetic triangular lattices

Cited by 24 publications

References 56 publications

Skyrmion crystal and spiral phases in centrosymmetric bilayer magnets with staggered Dzyaloshinskii-Moriya interaction

Skyrmion crystal and spiral phases in centrosymmetric bilayer magnets with staggered Dzyaloshinskii-Moriya interaction

Stability of skyrmion crystal phase in antiferromagnetic triangular lattice with DMI and single-ion anisotropy

Road to zero-field antiferromagnetic skyrmions in a frustrated AFM/FM heterostructure

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