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Topological spin-hedgehog crystals of a chiral magnet as engineered with magnetic anisotropy

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Kanazawa N., White J. S., Rønnow H. M., Dewhurst C. D., Morikawa D., Shibata K., Arima T., Kagawa F., Tsukazaki A., Kozuka Y., Ichikawa M., Kawasaki M., Tokura Y.,
Project Exploration of emerging magnetoelectric coupling effects in new materials
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 96(22)
Page(s) 220414 - 220414
Title of proceedings Physical Review B
DOI 10.1103/physrevb.96.220414

Abstract

We report the engineering of spin-hedgehog crystals in thin films of the chiral magnet MnGe by tailoring the magnetic anisotropy. As evidenced by neutron scattering on films with different thicknesses and by varying a magnetic field, we can realize continuously deformable spin-hedgehog crystals, each of which is described as a superposition state of a different set of three spin spirals (a triple-q state). The directions of the three propagation vectors q vary systematically, gathering from the three orthogonal ⟨100⟩ directions towards the film normal as the strength of the uniaxial magnetic anisotropy and/or the magnetic field applied along the film normal increase. The formation of triple-q states coincides with the onset of topological Hall signals, that are ascribed to skew scattering by an emergent magnetic field originating in the nontrivial topology of spin hedgehogs. These findings highlight how nanoengineering of chiral magnets makes possible the rational design of unique topological spin textures.
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