Topological magnetic-spin textures in two-dimensional van der Waals Cr2Ge2Te6

Abstract

Two-dimensional (2D) van der Waals (vdW) materials show a range of profound physical properties that can be tailored through their incorporation in heterostructures and manipulated with external forces. The recent discovery of long-range ferromagnetic order down to atomic layers provides an additional degree of freedom in engineering 2D materials and their heterostructure devices for spintronics, valleytronics and magnetic tunnel junction switches. Here, using direct imaging by cryo-Lorentz transmission electron microscopy we show that topologically nontrivial magnetic-spin states, skyrmionic bubbles, can be realized in exfoliated insulating 2D vdW Cr2Ge2Te6. Due to the competition between dipolar interactions and uniaxial magnetic anisotropy, hexagonally-packed nanoscale bubble lattices emerge by field cooling with magnetic field applied along the out-of-plane direction. Despite a range of topological spin textures in stripe domains arising due to pair formation and annihilation of Bloch lines, bubble lattices with single chirality are prevalent. Our observation of topologically-nontrivial homochiral skyrmionic bubbles in exfoliated vdW materials provides a new avenue for novel quantum states in atomically-thin insulators for magneto-electronic and quantum devices.

References in corpus (14)

• Van der Waals heterostructures
• 2D materials and van der Waals heterostructures
• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Magnetic 2D materials and heterostructures
• Electrical Control of 2D Magnetism in Bilayer CrI3
• Giant Tunneling Magnetoresistance in Spin-Filter van der Waals Heterostructures
• Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
• Very Large Tunneling Magnetoresistance in Layered Magnetic Semiconductor CrI${}_3$
• Magnetic ground state of semiconducting transition metal trichalcogenide monolayers
• Magnetic skyrmion-based synaptic devices
• Soliton-like magnetic domain wall motion induced by the interfacial Dzyaloshinskii-Moriya interaction
• Critical behavior of quasi-two-dimensional semiconducting ferromagnet CrGeTe${}_3$

Cited by in corpus (55)

• Observation of Magnetic Skyrmion Bubbles in a van der Waals ferromagnet Fe3GeTe2
• Néel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures
• Electrical control of magnetism by electric field and current-induced torques
• Meron-Like Topological Spin Defects in Monolayer CrCl3
• Room-temperature sub-100 nm Néel-type skyrmions in non-stoichiometric van der Waals ferromagnet $\mathrm{F}{\mathrm{e}}_{3-\mathrm{x}}\mathrm{GaT}{\mathrm{e}}_2$ with ultrafast laser writability
• Van der Waals Ferromagnetic Josephson Junctions
• Imaging domain reversal in an ultrathin van der Waals ferromagnet
• Curved Magnetism in CrI${}_3$
• Magnetization textures in twisted bilayer 2D CrX${}_3$ (X=Br, I)
• Laser-induced topological spin switching in a 2D van der Waals magnet
• Two-dimensional characterization of three-dimensional magnetic bubbles in Fe${}_3$Sn${}_2$ nanostructures
• Opportunities in Electrically Tunable 2D Materials Beyond Graphene: Recent Progress and Future Outlook
• 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
• Current-Controlled Topological Magnetic Transformations in a Nanostructured Kagome Magnet
• Dirac fermions in half-metallic ferromagnetic mixed Cr${}_{1\text{-}x}$M${}_x$PSe${}_3$ monolayers
• Effects of Fe deficiency and Co substitution in polycrystalline and single crystals of Fe${}_3$GeTe${}_2$
• Whirling interlayer fields as a source of stable topological order in moiré CrI3
• Magnetic domain walls of the van der Waals material Fe${}_3$GeTe${}_2$
• Magnon-magnon interaction and magnon relaxation time in ferromagnetic Cr2Ge2Te6 monolayer
• Skyrmion-Bubble Bundles in an X-type Sr2Co2Fe28O46 Hexaferrite above Room Temperature
• Non-reciprocal magnons in a two dimensional crystal with off-plane magnetization
• Visualizing thickness-dependent magnetic textures in few-layer ${\text{Cr}}_2{\text{Ge}}_2{\text{Te}}_6$
• Polaronic Conductivity in Cr${}_2$Ge${}_2$Te${}_6$ Single Crystals
• Prediction of stable nanoscale skyrmions in monolayer Fe${}_5$GeTe${}_2$
• Modulation of skyrmionic magnetic textures in two-dimensional vdW materials and their heterostructures
• Observation of Hybrid Magnetic Skyrmion Bubbles in Fe3Sn2 Nanodisks
• Frustration-induced magnetic bimerons in transition metal halide CoX2 (X = Cl, Br) monolayers
• Topological magnon-photon interaction for cavity magnonics
• Crossover from relativistic to non-relativistic net magnetization for MnTe altermagnet candidate
• The effect of surface oxidation and crystal thickness on magnetic properties and magnetic domain structures of Cr2Ge2Te6
• Noncollinear topological textures in two-dimensional van der Waals materials: From magnetic to polar systems
• Electric-field-induced formation and annihilation of skyrmions in two-dimensional magnet
• Creating and Deleting a Single Dipolar Skyrmion by Surface Spin Twists
• Controllable highly oriented skyrmion track array in Fe3GaTe2
• Flux-pinning mediated superconducting diode effect in the NbSe${}_2$/CrGeTe${}_3$ heterostructure
• Designing layered 2D skyrmion lattices in moiré magnetic hetero-structures
• Local Inversion Symmetry Breaking and Thermodynamic Evidence for Ferrimagnetism in Fe3GaTe2
• Surface structures of the magnetostrictive D03-Fe3Ga(001)
• All-electric control of skyrmion-bimeron transition in van der Waals heterostructures
• Electrically tunable room-temperature ferromagnetism in CrBr${}_3$
• Emergent Topological Hall Effect in Fe-doped Monolayer WSe2
• Momentum-space theory for topological magnons in 2D ferromagnetic skyrmion lattices
• 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
• Tuning of magnetic structures topology via single-ion anisotropy and magnetic field in frustrated 2D semiconductors
• Multi-Meron Interactions and Statistics in Two-Dimensional Materials
• Spin-valve effect for spin-polarized surface states in topological semimetals
• Regularized Micromagnetic Theory for Bloch Points
• Surface spin polarization in the magnetic response of GeTe Rashba ferroelectric
• Magnetoelectricity of Topological Solitons in 2D Magnets
• Long lifetimes of nanoscale skyrmions in lithium-decorated van der Waals ferromagnet Fe${}_3$GeTe${}_2$
• Towards reliable electrical measurements of superconducting devices inside a transmission electron microscope
• Magnetocaloric effect for the topological semimetal Co${}_3$Sn${}_2$S${}_2$ due to the antiferromagnetic coupling of the bulk and surface spin-polarized phases
• A new skyrmion topological transition driven by higher-order exchange interactions in Janus MnSeTe
• Topological Magnon-Plasmon Hybrids