Chirality coupling in topological magnetic textures with multiple magnetochiral parameters

Oleksii M. Volkov (), Daniel Wolf (), Oleksandr V. Pylypovskyi, Attila Kákay, Denis D. Sheka, Bernd Büchner, Jürgen Fassbender, Axel Lubk and Denys Makarov ()
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Oleksii M. Volkov: Institute of Ion Beam Physics and Materials Research
Daniel Wolf: Institute for Solid State Research
Oleksandr V. Pylypovskyi: Institute of Ion Beam Physics and Materials Research
Attila Kákay: Institute of Ion Beam Physics and Materials Research
Denis D. Sheka: Taras Shevchenko National University of Kyiv
Bernd Büchner: Institute for Solid State Research
Jürgen Fassbender: Institute of Ion Beam Physics and Materials Research
Axel Lubk: Institute for Solid State Research
Denys Makarov: Institute of Ion Beam Physics and Materials Research

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Chiral effects originate from the lack of inversion symmetry within the lattice unit cell or sample’s shape. Being mapped onto magnetic ordering, chirality enables topologically non-trivial textures with a given handedness. Here, we demonstrate the existence of a static 3D texture characterized by two magnetochiral parameters being magnetic helicity of the vortex and geometrical chirality of the core string itself in geometrically curved asymmetric permalloy cap with a size of 80 nm and a vortex ground state. We experimentally validate the nonlocal chiral symmetry breaking effect in this object, which leads to the geometric deformation of the vortex string into a helix with curvature 3 μm−1 and torsion 11 μm−1. The geometric chirality of the vortex string is determined by the magnetic helicity of the vortex texture, constituting coupling of two chiral parameters within the same texture. Beyond the vortex state, we anticipate that complex curvilinear objects hosting 3D magnetic textures like curved skyrmion tubes and hopfions can be characterized by multiple coupled magnetochiral parameters, that influence their statics and field- or current-driven dynamics for spin-orbitronics and magnonics.

Date: 2023
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DOI: 10.1038/s41467-023-37081-z

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