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001     1008688
005     20231215103936.0
024 7 _ |a 10.3389/fphy.2023.1223609
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100 1 _ |a Savchenko, Andrii S.
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245 _ _ |a Magnetic bubbles with alternating chirality in domain walls
260 _ _ |a Lausanne
|c 2023
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520 _ _ |a In magnetic multilayers with perpendicular anisotropy, the competition of short-range and long-range interactions gives rise to the stability of cylindrical magnetic domains, also known as magnetic bubbles. The presence of Dzyaloshinsky-Moriya interaction induced by asymmetric interfaces between magnetic and nonmagnetic layers may lead to the formation of cylindrical bubble domains with Neel-type domain walls across the whole thickness of the multilayer. Such domain walls produce no contrast in Lorentz TEM under the normal incidence of the electron beam to the film. The latter is often used as an argument for the presence of Dzyaloshinskii-Moriya interaction in the system. Here we show that in magnetic multilayers, the absence of the Lorentz TEM contrast might also have another origin. In particular, in the absence of interfacial Dzyaloshinskii-Moriya interaction and weak interlayer exchange coupling, the magnetic bubbles might have Bloch-type domain walls of alternate chirality in adjacent layers. Such domain walls also do not produce magnetic contrast in Lorentz TEM at normal incidence of the electron beam. We show that, in the absence of interlayer exchange coupling, the magnetic bubble domains with the domain walls of fixed and alternate chirality have nearly identical energies and can coexist in the same range of magnetic fields. Using the geodesic nudged elastic band method, we prove that these states are separated by finite energy barriers. Furthermore, we demonstrate that magnetic multilayers with only dipolar coupling, besides the magnetic bubbles with nontrivial topology in all layers, can accommodate solutions with trivial topology within the internal layers.
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536 _ _ |a 3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538)
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700 1 _ |a Kuchkin, Vladyslav
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700 1 _ |a Rybakov, Filipp N.
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700 1 _ |a Kiselev, Nikolai
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773 _ _ |a 10.3389/fphy.2023.1223609
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856 4 _ |u https://juser.fz-juelich.de/record/1008688/files/fphy-11-1223609.pdf
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