Topological Hall effect in the A phase of MnSi.
By A. Neubauer, C. Pfleiderer, B. Binz, Achim Rosch, R. Ritz, P. G. Niklowitz, P. Böni. Physical Review Letters, 2009
1,125 citations recorded by the source corpus.
Recent small angle neutron scattering suggests that the spin structure in the A phase of MnSi is a so-called triple-Q state, i.e., a superposition of three helices under 120 degrees. Model calculations indicate that this structure in fact is a lattice of so-called Skyrmions, i.e., a lattice of topologically stable knots in the spin structure. We report a distinct additional contribution to the Hall effect in the temperature and magnetic field range of the proposed Skyrmion lattice, where such a contribution is neither seen nor expected for a normal helical state. Our Hall effect measurements constitute a direct observation of a topologically quantized Berry phase that identifies the spin structure seen in neutron scattering as the proposed Skyrmion lattice.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/3b101de56a306d2c025eea9479453bc79c7b5a74
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Interface-Induced Phenomena in Magnetism (2016, positive): “The accumulated Berry phase as conduction electron spins move through a locally-varying magnetic texture gives rise to emergent electrodynamic fields; for example, electrons traversing a skyrmion experience an effective magnetic field that leads to a topological contribution to the Hall effect [Neub”
- Heusler 4.0: Tunable Materials (2016, background): “Note that materials that have skyrmions also exhibit a large THE due to their chiral non-collinear spin structures (74, 75).”
- Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications (2019, methodology): “A promising method to read skyrmions electrically is by harnessing the topological Hall effect (THE) of magnetic skyrmions [162, 242-244].”
- Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers. (2016, neutral): “This is comparable in magnitude to previous studies of bulk DMI materials 32,34,39 , where the observed ρ TH xy ( H ) (2-100 n W - cm) has been attributed to Bloch skyrmions 32,34,39 .”
- Emergent electrodynamics of skyrmions in a chiral magnet (2012, background): “[6]).”
- Ginzburg-Landau theory for skyrmions in inversion-symmetric magnets with competing interactions (2015, background): “Due to their unique topology, skyrmions give birth to many emergent phenomena, such as topological Hall effect [4, 5], magnetoelectric coupling [6, 7] etc.”
- Antiferromagnetic spintronics (2016, background): “It is therefore similar to the topological Hall effect observed in ferromagnetic textures such as vortices and skyrmions (Neubauer et al., 2009).”