Topological Phenomena in Magnetic Heterostructures

Magnetic heterostructures—multilayer or bilayer assemblies of ferromagnets, heavy metals and oxides—offer a versatile platform for exploring topological spin textures and their emergent electrodynamics. At the heart of this field are magnetic skyrmions, chiral domain walls and related non-collinear configurations that carry quantised topological charge. Spin–orbit coupling at interfaces and broken inversion symmetry give rise to Dzyaloshinskii–Moriya interactions, stabilising nanoscale spin vortices and enabling control of emergent magnetic fields. These textures manifest in distinctive transport signatures, notably the topological Hall effect, and in magneto-optical phenomena such as Kerr rotation. Electric fields, ionic gating and interface engineering permit dynamic tuning of spin textures, opening pathways to low-power spintronic devices, neuromorphic architectures and integrated photonics. Progress in fabrication of oxide and metallic heterostructures has facilitated real-time imaging of chiral textures and precise measurement of their electronic fingerprints. The interplay of band topology, interfacial anisotropy and multiband transport underpins a rapidly evolving research landscape with both fundamental and applied significance.

Research from Nature Portfolio

Recent studies have revealed a magneto-optical Kerr effect uniquely induced by skyrmion lattices in a layered rare-earth intermetallic. This topological MOKE arises from emergent gauge fields that reconstruct electronic bands, yielding pronounced optical rotation well into the sub-eV regime. Such light–skyrmion interactions point to integrated photonic–spintronic platforms.

Investigations of chiral spin fluctuations at the phase boundary between isolated skyrmions and disordered lattices in heavy-metal multilayers have uncovered a colossal enhancement of the topological Hall resistivity by orders of magnitude. The work emphasises the critical role of skyrmion stability and configuration in determining emergent transport responses.

Critical appraisal of Hall measurements in oxide heterostructures has highlighted intrinsic ambiguities when inhomogeneous magnetisation mimics topological signals. Analysis of oxide ferromagnets shows that spatial variations in anomalous Hall behaviour can be misinterpreted as evidence for chiral textures, underscoring the need for complementary imaging probes.

Topological Phenomena in Magnetic Heterostructures publication trend

The graph below shows the total number of articles in topological phenomena in magnetic heterostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Skyrmion: A stable, nanoscale vortex of spins carrying a quantised topological charge.

Topological Hall effect: A transverse voltage arising from conduction electrons traversing chiral spin textures.

Dzyaloshinskii–Moriya interaction: An antisymmetric exchange interaction at interfaces that stabilises chiral spin structures.

Berry phase: A geometric phase acquired by an electron’s wavefunction in momentum or real space, linked to curvature in parameter space.

Heterostructure: A layered assembly of different materials engineered at the atomic scale to tailor electronic and magnetic interactions.

Magneto-optical Kerr effect: Rotation of the polarization plane of reflected light induced by magnetisation near an interface.

References

1. Topological magneto-optical effect from skyrmion lattice. Nature Communications (2023).
2. Colossal topological Hall effect at the transition between isolated and lattice-phase interfacial skyrmions. Nature Communications (2021).
3. Inhomogeneous ferromagnetism mimics signatures of the topological Hall effect in SrRuO3 films. Physical Review Materials (2020).
4. Topological Hall Effect of Skyrmions from first Principles. Physical Review X (2025).
5. Berry phase engineering at oxide interfaces. Physical Review Research (2020).