Multiplet of skyrmion states on a curvilinear defect: Reconfigurable skyrmion lattices
Multiplet of skyrmion states on a curvilinear defect: Reconfigurable skyrmion lattices
Kravchuk, V. P.; Sheka, D. D.; Kákay, A.; Volkov, O. M.; Rößler, U. K.; van den Brink, J.; Makarov, D.; Gaididei, Y.
Typically, the chiral magnetic Skyrmion is a single-state excitation. Here we propose a system, where multiplet of Skyrmion states appears and one of these states can be the ground one. We show that the presence of a localized curvilinear defect drastically changes the magnetic properties of a thin perpendicularly magnetized ferromagnetic film. For a large enough defect amplitude a discrete set of equilibrium magnetization states appears forming a ladder of energy levels. Each equilibrium state has either a zero or a unit topological charge; i.e., topologically trivial and Skyrmion multiplets generally appear. Transitions between the levels with the same topological charge are allowed and can be utilized to encode and switch a bit of information. There is a wide range of geometrical and material parameters, where the Skyrmion level has the lowest energy. Thus, periodically arranged curvilinear defects can result in a Skyrmion lattice as the ground state.
Keywords: Skyrmions; curvilinear defects
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Physical Review Letters 120(2018), 067201
Online First (2018) DOI: 10.1103/PhysRevLett.120.067201
Cited 62 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-27139
Publ.-Id: 27139