Journal of Superconductivity and Novel Magnetism

, Volume 32, Issue 2, pp 237–246 | Cite as

Study of Nucleation/Annihilation Process and Vortices Characteristics in Co/Py Rectangular Bilayers

  • M. Fattouhi
  • M. Y. El Hafidi
  • M. El HafidiEmail author
  • A. Kassiba
  • N. Yaacoub
Original Paper


Vortices are topological structures, which are characterized by circular organization of magnetic moments and by chirality. In this paper, we investigate the impact of film lateral dimensions and thicknesses on magnetization reversibility by applying an in-plane external magnetic field on Co(tCo)/Py (3 nm) bilayers where the Py is the permalloy, a ferromagnetic alloy of nickel and iron (Ni80Fe20). The study is achieved by using appropriate micromagnetic simulations. We also show that the vortices number and their sizes can be controlled by playing on the lateral dimensions and the thickness of the bilayer.


Vortices Nucleation Annihilation Permalloy Cobalt Micromagnetic simulations Magnetic force microscopy (MFM) Rectangular films Reversal magnetization 


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • M. Fattouhi
    • 1
  • M. Y. El Hafidi
    • 1
  • M. El Hafidi
    • 1
    Email author
  • A. Kassiba
    • 2
  • N. Yaacoub
    • 2
  1. 1.Condensed Matter Physics Laboratory, Faculty of Science Ben M’sikHassan II University of CasablancaCasablancaMorocco
  2. 2.IMMM-UMR CNRS 6283Université du Maine Avenue Olivier MessiaenLe Mans Cedex 9France

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