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@INPROCEEDINGS{Aldarawsheh:1006620,
      author       = {Aldarawsheh, Amal and Fernandes, Imara Lima and Brinker,
                      Sascha and Sallermann, Moritz and MuayadAbusaa5 and Blügel,
                      Stefan and Lounis, Samir},
      title        = {{E}mergence of zero-field non-synthetic single and
                      catenated antiferromagnetic skyrmions in thin films},
      reportid     = {FZJ-2023-01753},
      year         = {2022},
      abstract     = {Antiferromagnetic (AFM) skyrmions are envisioned as ideal
                      localized topological magneticbits in future information
                      technologies. In contrast to ferromagnetic (FM) skyrmions,
                      they are immune to the skyrmion Hall effect [1, 2], might
                      offer potential terahertz dynamics [3] while being
                      insensitive to external magnetic fields and dipolar
                      interactions. Although observed in synthetic AFM structures
                      [4] and as complex meronic textures in intrinsic AFM bulk
                      materials [5, 6] , their realization in non-synthetic AFM
                      films, of crucial importance in racetrack concepts, has been
                      elusive. Here, we unveil their presence in a row-wise AFM Cr
                      film deposited on PdFe bilayer grown on fcc Ir(111) surface.
                      Using first principles, we demonstrate the emergence of
                      single and strikingly interpenetrating catenated AFM
                      skyrmions, which can co-exist with the rich inhomogeneous
                      exchange field, including that of FM skyrmions, hosted by
                      PdFe. Besides the identification of an ideal platform of
                      materials for intrinsic AFM skyrmions, we anticipate the
                      uncovered knotted solitons to be promising building blocks
                      in AFM spintronics. [1] Barker, J. $\&$ Tretiakov, O. A.,
                      Physical review letters (2016). [2] Zhang, X., Zhou, Y. $\&$
                      Ezawa, M., Scientific reports (2016). [3] Gomonay, O.,
                      Baltz, V., Brataas, A. $\&$ Tserkovnyak, Y. Nature Physics
                      (2018). [4] Legrand, W., Maccariello, D., Ajejas, F.,
                      Collin, S., Vecchiola, A., Bouzehouane, K., R eyren, N.,
                      Cros, V. $\&$ Fert, A., Nature materials (2020). [5] Gao,
                      S., Rosales, H., Gómez Albarracín, F. A., Tsurkan, V.,
                      Kaur, G., Fennell, T., ... $\&$ Zaharko, O., Nature (2020).
                      [6] Jani, H., Lin, J. C., Chen, J., Harrison, J.,
                      Maccherozzi, F., Schad, J., ... $\&$ Radaelli, P. G., Nature
                      (2021).},
      month         = {Jul},
      date          = {2022-07-10},
      organization  = {International Colloquium on Magnetic
                       Films and Surfaces, Okinawa (Japan), 10
                       Jul 2022 - 15 Jul 2022},
      subtyp        = {Other},
      cin          = {IAS-1 / PGI-1},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106},
      pnm          = {5211 - Topological Matter (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5211},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1006620},
}