Magnetic skyrmions in atomic thin CrI3 monolayer

Behera, Aroop K.; Chowdhury, Sugata; Das, Suprem R.

doi:10.1063/1.5096782

Cited by 90 publications

(69 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…NiI 2 is a centrosymmetric magnetic semiconductor long known for its exotic helimagnetism [26][27][28][29] . It belongs to the family of transition-metal-based van der Waals materials recently object of intense research activity due to their intriguing low dimensional magnetic properties [30][31][32][33][34][35][36][37][38][39] . A single layer of NiI 2 is characterized by a triangular net of magnetic cations at distance a 0 and competing ferro (FM)-magnetic and antiferro(AFM)-magnetic interactions, resulting in strong magnetic frustration ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Spontaneous skyrmionic lattice from anisotropic symmetric exchange in a Ni-halide monolayer

2020

View full text Add to dashboard Cite

Topological spin structures, such as magnetic skyrmions, hold great promises for data storage applications, thanks to their inherent stability. In most cases, skyrmions are stabilized by magnetic fields in non-centrosymmetric systems displaying the chiral Dzyaloshinskii-Moriya exchange interaction, while spontaneous skyrmion lattices have been reported in centrosymmetric itinerant magnets with long-range interactions. Here, a spontaneous anti-biskyrmion lattice with unique topology and chirality is predicted in the monolayer of a semiconducting and centrosymmetric metal halide, NiI2. Our first-principles and Monte Carlo simulations reveal that the anisotropies of the short-range symmetric exchange, when combined with magnetic frustration, can lead to an emergent chiral interaction that is responsible for the predicted topological spin structures. The proposed mechanism finds a prototypical manifestation in two-dimensional magnets, thus broadening the class of materials that can host spontaneous skyrmionic states.

show abstract

Section: Resultsmentioning

confidence: 99%

Spontaneous skyrmionic lattice from anisotropic symmetric exchange in a Ni-halide monolayer

2020

View full text Add to dashboard Cite

show abstract

“…In a material with such large SOC and broken inversion symmetry, the antisymmetric exchange interaction, the so called Dzyaloshinskii-Moriya interaction (DMI) [13,14], can emerge and be strong enough to stabilize topological magnetic configurations including skyrmions [15,16]. Recent theoretical works have also discussed the emergence of DMI in vdW magnets with various possible origins, e.g., crystal symmetry or sample boundary, as well as resulting skyrmion stabilization [17][18][19]. Once established, by taking advantages of other 2D crystals that are stackable and offer unique electrical properties [1,2], this material platform could provide a different route towards skyrmion-based devices that have been challenging with conventional metallic ferromagnets [20,21].…”

Section: Introductionmentioning

confidence: 99%

Néel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures

Park¹,

Peng²,

Liang³

et al. 2021

Phys. Rev. B

155

161

View full text Add to dashboard Cite

Since the discovery of ferromagnetic two-dimensional (2D) van der Waals (vdW) crystals, significant interest on such 2D magnets has emerged, inspired by their appealing physical properties and integration with other 2D family for unique heterostructures. In known 2D magnets, spin-orbit coupling (SOC) stabilizes perpendicular magnetic anisotropy down to one or a few monolayers. Such a strong SOC could also lift the chiral degeneracy, leading to the formation of topological magnetic textures such as skyrmions through the Dzyaloshinskii-Moriya interaction (DMI). Here, we report the experimental observation of Néel-type chiral magnetic skyrmions and their lattice (SkX) formation in a vdW ferromagnet Fe 3 GeTe 2 (FGT). We demonstrate the ability to drive an individual skyrmion by short current pulses along a vdW heterostructure, FGT/h-BN, as highly required for any skyrmion-based spintronic device. Using first principle calculations supported by experiments, we unveil the origin of DMI being the interfaces with oxides, which then allows us to engineer vdW heterostructures for desired chiral states. Our finding opens the door to topological spin textures in the 2D vdW magnet and their potential device application.

show abstract

“…Some complexity is imparted by the role of spin-orbit coupling (SOC). For example, the presence and role of the Dzyaloshinskii-Moriya interaction (DMI), which is essential for materials to host topological magnons and other topological objects such as skyrmions 13,14 , remains puzzling. Specifically, 2D honeycomb ferromagnets can be viewed as the magnetic analog of graphene 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials

Katsnelson

2021

npj Comput Mater

View full text Add to dashboard Cite

Despite serious effort, the nature of the magnetic interactions and the role of electron-correlation effects in magnetic two-dimensional (2D) van der Waals materials remains elusive. Using CrI3 as a model system, we show that the calculated electronic structure including nonlocal electron correlations yields spin excitations consistent with inelastic neutron-scattering measurements. Remarkably, this approach identifies an unreported correlation-enhanced interlayer super-superexchange, which rotates the magnon Dirac lines off, and introduces a gap along the high-symmetry Γ-K-M path. This discovery provides a different perspective on the gap-opening mechanism observed in CrI3, which was previously associated with spin–orbit coupling through the Dzyaloshinskii–Moriya interaction or Kitaev interaction. Our observation elucidates the critical role of electron correlations on the spin ordering and spin dynamics in magnetic van der Waals materials and demonstrates the necessity of explicit treatment of electron correlations in the broad family of 2D magnetic materials.

show abstract

Magnetic skyrmions in atomic thin CrI3 monolayer

Cited by 90 publications

References 43 publications

Spontaneous skyrmionic lattice from anisotropic symmetric exchange in a Ni-halide monolayer

Spontaneous skyrmionic lattice from anisotropic symmetric exchange in a Ni-halide monolayer

Néel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures

Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials

Contact Info

Product

Resources

About