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

Abstract

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 properties and integration with other 2D family for unique heterostructures. In known 2D magnets, spin-orbit coupling (SOC) stabilizes perpendicular magnetic anisotropy (PMA). 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 Fe3GeTe2 (FGT). We demonstrate the ability to drive 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.

arXiv comment26 pages, 5 figures

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• Synthesis, Engineering, and Theory of 2D van der Waals Magnets
• Large-scale epitaxy of two-dimensional van der Waals room-temperature ferromagnet Fe5GeTe2
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• Chiral Spin Spirals at the Surface of the van der Waals Ferromagnet Fe${}_3$GeTe${}_2$
• Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials
• Tunable Néel-Bloch magnetic twists in Fe3GeTe2 with van der Waals structure
• Strain-Driven Zero-Field Near-10 nm Skyrmions in Two-Dimensional van der Waals Heterostructures
• Anisotropic Dzyaloshinskii-Moriya interaction and topological magnetism in two-dimensional magnets protected by P4-m2 crystal symmetry
• From Early Theories of Dzyaloshinskii-Moriya Interactions in Metallic Systems to Today's Novel Roads
• Heterobilayer moiré magnets: moiré skyrmions and the commensurate-incommensurate transition
• Switching intrinsic magnetic skyrmions with controllable magnetic anisotropy in van der Waals multiferroic heterostructures
• Dzyaloshinskii-Moriya interaction and magnetic skyrmions induced by curvature
• Tuning the magnetic interactions in van der Waals Fe${}_3$GeTe${}_2$ heterostructures: A comparative study of \textit{ab initio} methods
• Effects of Fe deficiency and Co substitution in polycrystalline and single crystals of Fe${}_3$GeTe${}_2$
• Complex Spin Hamiltonian Represented by Artificial Neural Network
• Magnetic Anisotropy in Two-dimensional van der Waals Magnetic Materials and Their Heterostructures: Importance, Mechanisms, and Opportunities
• Giant 2D Skyrmion Topological Hall Effect with Ultrawide Temperature Window and Low-Current Manipulation in 2D Room-Temperature Ferromagnetic Crystals
• Strong bulk spin-orbit torques quantified in the van der Waals ferromagnet Fe3GeTe2
• Magnetic Antiskyrmions in Two-Dimensional van der Waals Magnets Engineered by Layer Stacking
• A hierarchy of multi-moment skyrmion phases in twisted magnetic bilayers
• Tuning the Room Temperature Ferromagnetism in Fe5GeTe2 by Arsenic Substitution
• Prediction of stable nanoscale skyrmions in monolayer Fe${}_5$GeTe${}_2$
• Superexchange interactions and magnetic anisotropy in MnPSe${}_3$ monolayer
• Strong Dzyaloshinskii-Moriya Interaction in Monolayer CrI${}_3$ on Metal Substrates
• Imaging current control of magnetization in Fe${}_3$GeTe${}_2$ with a widefield nitrogen-vacancy microscope
• Modulation of skyrmionic magnetic textures in two-dimensional vdW materials and their heterostructures
• On-site and inter-site Hubbard corrections in magnetic monolayers: The case of FePS${}_3$ and CrI${}_3$
• Stability of the In-Plane Room Temperature van der Waals Ferromagnet Chromium Ditelluride and Its Conversion to Chromium-Interleaved CrTe${}_2$ Compounds
• Proposal for all-electrical skyrmion detection in van der Waals tunnel junctions
• Electron transport and scattering mechanisms in ferromagnetic monolayer Fe${}_3$GeTe${}_2$
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• Modification of unconventional Hall effect with doping at the non-magnetic site in a 2D van der Waals ferromagnet
• Hidden interplay of current-induced spin and orbital torques in bulk Fe${}_3$GeTe${}_2$
• Quartic asymmetric exchange for two-dimensional ferromagnets with trigonal prismatic symmetry
• Skyrmion crystal under $D_{3h}$ point group: Role of out-of-plane Dzyaloshinskii-Moriya interaction
• Local Inversion Symmetry Breaking and Thermodynamic Evidence for Ferrimagnetism in Fe3GaTe2
• Kinetically-controlled epitaxial growth of Fe${}_3$GeTe${}_2$ van der Waals ferromagnetic films
• Designing layered 2D skyrmion lattices in moiré magnetic hetero-structures
• Intermediate anomalous Hall states induced by noncollinear spin structure in magnetic topological insulator MnBi2Te4
• Anisotropic skyrmion mass induced by surrounding conduction electrons: A Schwinger-Keldysh field theory approach
• All-electric control of skyrmion-bimeron transition in van der Waals heterostructures
• Photocurrents of charge and spin in single-layer Fe${}_3$GeTe${}_2$
• Dzyaloshinskii-Moriya interaction in Fe5GeTe2 epitaxial thin films
• Magnetic order in the two-dimensional metal-organic framework manganese pyrazinecarboxylate with Mn-Mn dimers
• Anomalous magnetoentropic response of skrymion crystals
• Factors affecting the topological Hall effect in strongly correlated layered magnets: spin of the magnetic atoms, polar and azimuthal angle subtended by the spin texture
• Signatures of quartic asymmetric exchange in a class of two dimensional magnets
• Scanning Tunneling Microscopy Study of Epitaxial Fe3GeTe2 Monolayers on Bi2Te3
• Long lifetimes of nanoscale skyrmions in lithium-decorated van der Waals ferromagnet Fe${}_3$GeTe${}_2$
• Unconventional Hall effect and its variation with Co-doping in van der Waals Fe3GeTe2
• Spontaneous Enhancement of Dzyaloshinskii-Moriya Interaction via Field-Cooling-Induced Interface Engineering in 2D van der Waals Ferromagnetic ternary Tellurides
• Topological Magnon-Plasmon Hybrids
• Type-II Weyl nodes, flat bands, and evidence for a topological Hall-effect in the new ferromagnet FeCr${}_3$Te${}_6$