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@ARTICLE{Wysocki:875403,
      author       = {Wysocki, Lena and Yang, Lin and Gunkel, Felix and Dittmann,
                      Regina and van Loosdrecht, Paul H. M. and Lindfors-Vrejoiu,
                      Ionela},
      title        = {{V}alidity of magnetotransport detection of skyrmions in
                      epitaxial {S}r{R}u{O} 3 heterostructures},
      journal      = {Physical review materials},
      volume       = {4},
      number       = {5},
      issn         = {2475-9953},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2020-02012},
      pages        = {054402},
      year         = {2020},
      abstract     = {A technically simple way of probing the formation of
                      skyrmions is to measure the topological Hall resistivity
                      that should occur in the presence of skyrmions as an
                      additional contribution to the ordinary and anomalous Hall
                      effect. This type of probing, lately intensively used for
                      thin film samples, relies on the assumption that the
                      topological Hall effect contribution can be extracted
                      unambiguously from the measured total Hall resistivity.
                      Ultrathin films and heterostructures of the 4d ferromagnet
                      SrRuO3 have stirred up a lot of attention after the
                      observation of anomalies in the Hall resistivity, which
                      resembled a topological Hall effect contribution. These
                      anomalies, first reported for bilayers in which the SrRuO3
                      was interfaced with the strong spin-orbit coupled oxide
                      SrIrO3, were attributed to the formation of tiny Néel-type
                      skyrmions. Here we present the investigation of
                      heterostructures with two magnetically decoupled and
                      electrically parallel connected SrRuO3 layers. The two
                      SrRuO3 layers deliberately have different thicknesses, which
                      affects the coercive field and ferromagnetic transition
                      temperature of the two layers, and the magnitude and
                      temperature dependence of their anomalous Hall constants.
                      The SrRuO3 layers were separated by ultrathin layers of
                      either the strong spin-orbit coupling oxide SrIrO3 or of the
                      large band-gap insulator SrZrO3. Our magnetic and
                      magnetotransport studies confirm the additivity of the
                      anomalous Hall transverse voltages for the parallel
                      conducting channels originating from the two ferromagnetic
                      SrRuO3 layers as well as the possibility to tune the global
                      anomalous Hall resistivity by magnetic field, temperature,
                      or structural modifications at the epitaxial all-oxide
                      interfaces. The Hall voltage loops of these two-layer
                      heterostructures demonstrate the possibility to generate
                      humplike structures in the Hall voltage loops of SrRuO3
                      heterostructures without the formation of skyrmions and
                      emphasize that the detection of skyrmions only by Hall
                      measurements can be misleading.},
      cin          = {PGI-7 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000530033600005},
      doi          = {10.1103/PhysRevMaterials.4.054402},
      url          = {https://juser.fz-juelich.de/record/875403},
}