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@ARTICLE{Gaul:859724,
      author       = {Gaul, Alexander and Emmrich, Daniel and Ueltzhöffer, Timo
                      and Huckfeldt, Henning and Doğanay, Hatice and Hackl,
                      Johanna and Khan, Muhammad Imtiaz and Gottlob, Daniel M and
                      Hartmann, Gregor and Beyer, André and Holzinger, Dennis and
                      Nemšák, Slavomír and Schneider, Claus M and Gölzhäuser,
                      Armin and Reiss, Günter and Ehresmann, Arno},
      title        = {{S}ize limits of magnetic-domain engineering in continuous
                      in-plane exchange-bias prototype films},
      journal      = {Beilstein journal of nanotechnology},
      volume       = {9},
      issn         = {2190-4286},
      address      = {Frankfurt, M.},
      publisher    = {Beilstein-Institut zur Förderung der Chemischen
                      Wissenschaften},
      reportid     = {FZJ-2019-00561},
      pages        = {2968 - 2979},
      year         = {2018},
      abstract     = {Background: The application of superparamagnetic particles
                      as biomolecular transporters in microfluidic systems for
                      lab-on-a-chip applications crucially depends on the ability
                      to control their motion. One approach for magnetic-particle
                      motion control is the superposition of static magnetic stray
                      field landscapes (MFLs) with dynamically varying external
                      fields. These MFLs may emerge from magnetic domains
                      engineered both in shape and in their local anisotropies.
                      Motion control of smaller beads does necessarily need
                      smaller magnetic patterns, i.e., MFLs varying on smaller
                      lateral scales. The achievable size limit of engineered
                      magnetic domains depends on the magnetic patterning method
                      and on the magnetic anisotropies of the material system.
                      Smallest patterns are expected to be in the range of the
                      domain wall width of the particular material system. To
                      explore these limits a patterning technology is needed with
                      a spatial resolution significantly smaller than the domain
                      wall width.Results: We demonstrate the application of a
                      helium ion microscope with a beam diameter of 8 nm as a
                      mask-less method for local domain patterning of magnetic
                      thin-film systems. For a prototypical in-plane exchange-bias
                      system the domain wall width has been investigated as a
                      function of the angle between unidirectional anisotropy and
                      domain wall. By shrinking the domain size of periodic domain
                      stripes, we analyzed the influence of domain wall overlap on
                      the domain stability. Finally, by changing the geometry of
                      artificial two-dimensional domains, the influence of domain
                      wall overlap and domain wall geometry on the ultimate domain
                      size in the chosen system was analyzed.Conclusion: The
                      application of a helium ion microscope for magnetic
                      patterning has been shown. It allowed for exploring the
                      fundamental limits of domain engineering in an in-plane
                      exchange-bias thin film as a prototypical system. For
                      two-dimensional domains the limit depends on the domain
                      geometry. The relative orientation between domain wall and
                      anisotropy axes is a crucial parameter and therefore
                      influences the achievable minimum domain size dramatically.},
      cin          = {PGI-6},
      ddc          = {620},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30591845},
      UT           = {WOS:000451826800001},
      doi          = {10.3762/bjnano.9.276},
      url          = {https://juser.fz-juelich.de/record/859724},
}