Topological domain walls in helimagnets

Abstract

A magnetic helix arises in chiral magnets with a wavelength set by the spin-orbit coupling. We show that the helimagnetic order is a nanoscale analog to liquid crystals, exhibiting topological structures and domain walls that are distinctly different from classical magnets. Using magnetic force microscopy and micromagnetic simulations, we demonstrate that - similar to cholesteric liquid crystals - three fundamental types of domain walls are realized in the helimagnet FeGe. We reveal the micromagnetic wall structure and show that they can carry a finite skyrmion charge, permitting coupling to spin currents and contributions to a topological Hall effect. Our study establishes a new class of magnetic nano-objects with non-trivial topology, opening the door to innovative device concepts based on helimagnetic domain walls.

References in corpus (16)

• Skyrmion Lattice in a Chiral Magnet
• Topological Hall effect in the A-phase of MnSi
• Emergent electrodynamics of skyrmions in a chiral magnet
• Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe
• Thermally Driven Ratchet Motion of Skyrmion Microcrystal and Topological Magnon Hall Effect
• Universality of Phase Transition Dynamics: Topological Defects from Symmetry Breaking
• Magnon-skyrmion scattering in chiral magnets
• Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
• Theory of magnon-skyrmion scattering in chiral magnets
• Formation of a topological non-Fermi liquid in MnSi
• New spiral state and skyrmion lattice in 3D model of chiral magnets
• Metallic State in Cubic FeGe beyond its Quantum Phase Transition
• Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe
• Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi
• Domain walls in helical magnets
• Stray field signatures of Néel textured skyrmions in Ir/Fe/Co/Pt multilayer films

Cited by in corpus (36)

• Magnetic texture based magnonics
• Artificial double-helix for geometrical control of magnetic chirality
• Atomic-scale visualization of multiferroicity in monolayer NiI${}_2$
• Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
• Majorana modes in emergent-wire phases of helical and cycloidal magnet-superconductor hybrids
• Atomic scale visualization of topological spin textures in the chiral magnet MnGe
• Screw dislocations in cubic chiral magnets
• Combing the helical phase of chiral magnets with electric currents
• Response of the skyrmion lattice in MnSi to cubic magnetocrystalline anisotropies
• Deterministic generation of skyrmions and antiskyrmions by electric current
• Helitronics for classical and unconventional computing
• Arc-shaped structure factor in the $J_1$-$J_2$-$J_3$ classical Heisenberg model on the triangular lattice
• Field-induced reorientation of helimagnetic order in Cu${}_2$OSeO${}_3$ probed by magnetic force microscopy
• Detection of Topological Spin Textures via Non-Linear Magnetic Responses
• Microscopic Origin of the Electric Dzyaloshinskii-Moriya Interaction
• Critical Sample Aspect Ratio and Magnetic Field Dependence for Antiskyrmion Formation in Mn1.4PtSn Single-Crystals
• Interfacial phase frustration stabilizes unconventional skyrmion crystals
• Trapping Majorana Zero Modes in Vortices of Magnetic Texture Crystals Coupled to Nodal Superconductors
• Unpinning the skyrmion lattice in MnSi:Effect of substitutional disorder
• Antichiral Ferromagnetism
• Light-induced Dzyaloshinskii-Moriya interactions in antiferromagnetic metals
• Anomalous helimagnetic domain shrinkage due to the weakening of Dzyaloshinskii-Moriya interaction in CrAs
• Theory of charge and spin pumping in atomic-scale spiral magnets
• Imaging magnetic spiral phases, skyrmion clusters, and skyrmion displacements at the surface of bulk Cu${}_2$OSeO${}_3$
• Topological meron-antimeron domain walls and skyrmions in a low-symmetry system
• Topological Defect Mediated Helical Phase Reorientation by Uniaxial Stress
• Microscopic evidence of spin-driven multiferroicity and topological spin textures in monolayer NiI2
• Linear Response Based Theories for Dzyaloshinskii-Moriya Interactions
• Variational analysis of the $J_1$-$J_2$-$J_3$ model: a non-linear lattice version of the Aviles-Giga functional
• Imaging topological defects in a non-collinear antiferromagnet
• Thermally Activated Transitions Between Micromagnetic States
• Strain-driven domain wall network with chiral junctions in an antiferromagnet
• Electric Current Control of Helimagnetic Chirality from a Multidomain State in the Helimagnet MnAu${}_2$
• Phase-Factor-Controlled Surface Spirals in the Magnetic Conical Phase: The Role of In-Plane Directionality
• Structure and magnetism of MnGe thin films grown with a nonmagnetic CrSi template
• Nanoscale Skyrmions on a Square Atomic Lattice