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@ARTICLE{Savchenko:1008688,
      author       = {Savchenko, Andrii S. and Kuchkin, Vladyslav and Rybakov,
                      Filipp N. and Kiselev, Nikolai},
      title        = {{M}agnetic bubbles with alternating chirality in domain
                      walls},
      journal      = {Frontiers in physics},
      volume       = {11},
      issn         = {2296-424X},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2023-02479},
      pages        = {1223609},
      year         = {2023},
      abstract     = {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.},
      cin          = {IAS-1 / PGI-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106},
      pnm          = {5211 - Topological Matter (POF4-521) / 3D MAGiC -
                      Three-dimensional magnetization textures: Discovery and
                      control on the nanoscale (856538)},
      pid          = {G:(DE-HGF)POF4-5211 / G:(EU-Grant)856538},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001017882900001},
      doi          = {10.3389/fphy.2023.1223609},
      url          = {https://juser.fz-juelich.de/record/1008688},
}