Magnetic imaging of antiferromagnetic domain walls

Abstract

The control of domain walls or spin textures is crucial for spintronic applications of antiferromagnets. Despite many efforts, it has been challenging to directly visualize antiferromagnetic domains or domain walls with nanoscale resolution, especially in magnetic field. Here, we report magnetic imaging of domain walls in several uniaxial antiferromagnets, the topological insulator MnBi${}_2$Te${}_4$ family and the Dirac semimetal EuMnBi${}_2$, using cryogenic magnetic force microscopy (MFM). Our MFM results reveal higher magnetic susceptibility or net moments inside the domain walls than in domains. Domain walls in these antiferromagnets form randomly with strong thermal and magnetic field dependences. The direct visualization of domain walls and domain structure in magnetic field will not only facilitate the exploration of intrinsic phenomena in topological antiferromagnets, but also open a new path toward control and manipulation of domain walls or spin textures in functional antiferromagnets.

14 pages, 4 figures

References in corpus (4)

• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Antiferromagnetic topological insulators
• Crystal growth and magnetic structure of MnBi2Te4
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions

Cited by in corpus (30)

• Colloquium: Quantum anomalous Hall effect
• Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4
• Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi${}_2$Te${}_4$
• Visualizing Atomically-Layered Magnetism in CrSBr
• Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi2Te4 thin films
• Topological response of the anomalous Hall effect in MnBi2Te4 due to magnetic canting
• Dissipationless Layertronics in Axion Insulator $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$
• Direct evidence of ferromagnetism in MnSb2Te4
• Large Itinerant Electron Exchange Coupling in the Magnetic Topological Insulator MnBi2Te4
• Controllable chirality and band gap of quantum anomalous Hall insulators
• Electrically Controlled Anomalous Hall Effect and Orbital Magnetization in Topological Magnet MnBi2Te4
• Chern Number Tunable Quantum Anomalous Hall Effect in Compensated Antiferromagnets
• Ubiquitous order-disorder transition in the Mn antisite sublattice of the (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_n$ magnetic topological insulators
• On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family
• Layer Zero-Line Modes in Antiferromagnetic Topological Insulators
• Direct visualization of surface spin-flip transition in MnBi4Te7
• Group theory study of the vibrational modes and magnetic order in the topological antiferromagnet MnBi${}_2$Te${}_4$
• Detection of Topological Spin Textures via Non-Linear Magnetic Responses
• Quantum anomalous Hall effects controlled by chiral domain walls
• Correlation between magnetic domain structures and quantum anomalous Hall effect in epitaxial MnBi2Te4 thin films
• Intermediate anomalous Hall states induced by noncollinear spin structure in magnetic topological insulator MnBi2Te4
• Fresnel diffraction imaging of surface nanostructure using coherent resonant X-ray scattering
• Evidence of Weyl Fermion Enhanced Thermal Conductivity Under Magnetic Fields in Antiferromagnetic Topological Insulator Mn(Bi(1-x)Sb(x))2Te4
• Interfacing Quantum Spin Hall and Quantum Anomalous Hall insulators: Bi bilayer on MnBi${}_2$Te${}_4$-family materials
• Topological linear magnetoresistivity and thermoconductivity induced by noncentrosymmetric Berry curvature
• Detecting axion dynamics on the surface of magnetic topological insulators
• Strain-driven domain wall network with chiral junctions in an antiferromagnet
• Hedgehog-like spin texture in Sb-doped MnBi${}_2$Te${}_4$
• Topological Magnetoelectric Switching on the Atomic Scale