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@INPROCEEDINGS{MontanezHuaman:1014695,
      author       = {Montanez Huaman, Liz Margarita and Ahrens, Valentin and
                      Guasco, Laura and Keller, Thomas and Becherer, Markus and
                      Pütter, Sabine},
      title        = {{T}uning of {R}oom {T}emperature {S}kyrmions in
                      {P}t/{C}o/{T}a {M}ultilayers},
      reportid     = {FZJ-2023-03400},
      year         = {2023},
      abstract     = {Magnetic skyrmions are nanoscale topological objects which
                      are promising for next-generation information storage
                      technologies and computing. [1,2] In magnetic multilayers,
                      they can be stabilized at room temperature. [3-5]. Skyrmions
                      emerge due to an interplay between several magnetic
                      contributions. Among them the interfacial
                      Dzyaloshinskii-Moriya Interaction (DMI) drives the spins
                      into non-collinear orientation, while the perpendicular
                      magnetic anisotropy (PMA) favours the out-of-plane
                      orientation and the shape anisotropy prefers in-plane spin
                      orientation. To study this competition of energies and the
                      appearance of skyrmions, we have varied the Co film
                      thickness as well as the number of repetitions in
                      [Pt/Co(x)/Ta]$_N$ multilayers. This multilayer system was
                      chosen because it is an established multilayer system for
                      skyrmions and results can be compared with existing
                      investigations, like e.g. [3,6].Polycrystalline [Pt(40
                      Å)/Co(x)/Ta(19 Å)]$_N$ multilayers were fabricated in a
                      molecular beam epitaxy setup by thermal deposition on
                      oxidized Si(001) substrates with a buffer layer of 47 Å Ta
                      and a 30 Å Pt cap layer. The Co film thickness was varied
                      between 5 Å and 21 Å, the number of repetitions varied
                      between 8 and 10.Magnetic force microscopy measurements
                      reveal the existence of skyrmions at a Co thickness between
                      9Å and 17 Å. The figure below gives examples with varying
                      thickness and number of repetitions in indicated magnetic
                      field. The density of skyrmions as well as their size
                      varies. In remanence, stable skyrmions form only for the 17
                      Å Co sample with N=10 otherwise worm domains develop.
                      Topological Hall effect measurements confirm these
                      observations. The relationship between these findings is
                      discussed in this contribution.References [1] A. Fert, V.
                      Cros, and J. Sampaio, Nature Nanotech 8 (2013) 152. [2] K.
                      Raab, M.A. Brems, G. Beneke, et al., Nat Commun 13 (2022)
                      6982. [3] S. Woo, K. Litzius, B. Krüger, M.-Y. Im, L.
                      Caretta, K. Richter et al., Nat. Mat. 15 (2016) 501 [4] A.
                      Soumyanarayanan, M. Raju, A. Gonzalez Oyarce, et al., Nature
                      Mater 16 (2017) 898. [5] T.Dohi, R.M.Reeve and M. Kläui,
                      Annu Rev. Condens. Matter Phys. 13 (2022) 73. [6] S.Zhang,
                      J.Zhang, Y.Wen, E.M.Chudnovsky, and Y.Zhang, Comms. Phys. 36
                      (2018) 1.},
      month         = {Aug},
      date          = {2023-08-27},
      organization  = {Joint European Magnetic Symposia,
                       Madrid (Spain), 27 Aug 2023 - 1 Sep
                       2023},
      subtyp        = {After Call},
      cin          = {JCNS-4 / JCNS-FRM-II / MLZ},
      cid          = {I:(DE-Juel1)JCNS-4-20201012 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)MBE-MLZ-20151210},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1014695},
}