Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials

Abstract

In ferromagnets, electric current generally induces transverse Hall voltage in proportion to magnetization (anomalous Hall effect), and it is frequently used for electrical readout of the up and down spin states. While these properties are usually not expected in antiferromagnets, recent theoretical studies predicted that non-coplanar antiferromagnetic order with finite scalar spin chirality (i.e. solid angle spanned by neighboring spins) can often induce large spontaneous Hall effect even without net magnetization or external magnetic field. This phenomenon, i.e. spontaneous topological Hall effect, can potentially be used for the efficient electrical readout of the antiferromagnetic states, but its experimental verification has long been elusive due to the lack of appropriate materials hosting such exotic magnetism. Here, we report the discovery of all-in-all-out type non-coplanar antiferromagnetic order in triangular lattice compounds CoTa3S6 and CoNb3S6, by performing the detailed magnetic structure analysis based on polarized neutron scattering experiments as well as systematic first-principles calculations. These compounds are reported to host unconventionally large spontaneous Hall effect despite their vanishingly small net magnetization, and our analysis revealed that it can be well explained in terms of topological Hall effect, which originates from the fictitious magnetic field associated with scalar spin chirality in non-coplanar antiferromagnetic orders. The present results indicate that the scalar spin chirality mechanism can offer a promising route to realize giant spontaneous Hall response even in compensated antiferromagnets, and highlight intercalated van der Waals magnets as an unique quasi-two-dimensional material platform to enable various nontrivial manner of electrical reading and possible writing of non-coplanar antiferromagnetic domains.

to appear in Nature Physics

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• Enumeration and representation theory of spin space groups
• Spin-Polarized Antiferromagnetic Spintronics
• Symmetry analysis with spin crystallographic groups: Disentangling effects free of spin-orbit coupling in emergent electromagnetism
• Metallic $p$-wave magnet with commensurate spin helix
• Composition dependence of bulk properties in the Co-intercalated transition-metal dichalcogenide Co${}_{1/3}$TaS${}_2$
• Chiral Dirac fermion in a collinear antiferromagnet
• Multiferroic collinear antiferromagnet with hidden altermagnetic split
• Consequences and control of multi-scale (dis)order in chiral magnetic textures
• Magneto-optical spectra of an organic antiferromagnet as a candidate for an altermagnet
• Coupling of the triple-Q state to the atomic lattice by anisotropic symmetric exchange
• Gapped nodal planes drive a large topological Nernst effect in a chiral lattice antiferromagnet
• Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe
• Itinerant A-type Antiferromagnetic Order in Co${}_{0.25}$TaSe${}_2$
• Symmetry-breaking pathway towards the unpinned broken helix
• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Lattice-commensurate skyrmion texture in a centrosymmetric breathing kagome magnet
• Electrical control of topological 3Q state in intercalated van der Waals antiferromagnet Cox-TaS2
• Effect of collective spin excitation on electronic transport in topological spin texture
• Robust triple-q magnetic order with trainable spin vorticity in Na${}_2$Co${}_2$TeO${}_6$
• High harmonic generation from electrons moving in topological spin textures
• Anomalous valley Hall effect in monolayer chromium-based triple-Q magnets
• Antiferromagnetic order of topological orbital moments in atomic-scale skyrmion lattices
• Spin dynamics of triple-Q magnetic orderings in a triangular lattice: Implications for multi-Q orderings in general two-dimensional lattices
• Magnetic order in the two-dimensional metal-organic framework manganese pyrazinecarboxylate with Mn-Mn dimers
• Tunable bifurcation of magnetic anisotropy and bi-oriented antiferromagnetic order in kagome metal GdTi3Bi4
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
• Topological magneto-optics in the non-coplanar antiferromagnet Co_{1/3}NbS_2: Imaging and writing chiral magnetic domains
• Tunable chiral and nematic states in the triple-Q antiferromagnet Co${}_{1/3}$TaS${}_2$
• Peculiar magnetic and magneto-transport properties in a non-centrosymmetric self-intercalated van der Waals ferromagnet Cr5Te8
• Many-body Chern insulator in the Kondo lattice model on a triangular lattice
• On the angular dependence of anomalous Hall current
• Spin-Valley Locking in 2H-TaS2 and Its Co-Intercalated Counterpart: Roles of Surface Domains and Co Intercalation
• Topological Magneto-optical Kerr Effect without Spin-orbit Coupling in Spin-compensated Antiferromagnet
• Field-induced transformation between triangular and square skyrmion crystals in a tetragonal polar magnet
• Strain-driven domain wall network with chiral junctions in an antiferromagnet
• Theoretical design of the large topological magnetoelectric effect in the Co-intercalated NbS${}_2$ structure
• Measuring the Hall effect in hysteretic materials
• Discovery of Van Hove Singularities: Electronic Fingerprints of 3Q Magnetic Order in a van der Waals Quantum Magnet
• Kagome edge states under lattice termination, spin-orbit coupling, and magnetic order
• ${\mathbb{Z}}_2$ Vortex Crystals in Tetrahedral Antiferromagnets: Fractional Charges and Topological Magnons
• Correlation-driven origin of shallow electron pocket in Co${}_{1/3}$TaS${}_2$ revealed by ARPES and cluster perturbation theory
• Evidence for magnetoelastic coupling and chiral magnetic ground state in quasi-van der Waals tr-Cr${}_{1.22}$Te${}_2$
• Emergent 3D Fermiology and Magnetism in an Intercalated Van der Waals System
• Tangent equations of motion for nonlinear response functions
• Double-$Q$ chiral stripe order in the anomalous Hall antiferromagnet CoNb${}_3$S${}_6$
• Plasmon Engineering in Intercalated 2H-TaS${}_2$
• Topological Hall Effect in Antiferromagnetic Co doped Fe${}_3$GaTe${}_2$
• Van der Waals Antiferromagnets: From Early Discoveries to Future Directions in the 2D Limit
• Persistent Interfacial Topological Hall Effect Demonstrating Electrical Readout of Topological Spin Structures in Insulators
• Entropy-driven phase transition in a non-collinear antiferromagnet due to higher-order exchange interactions