Magnetic instabilities in thin non-planar ferromagnetic films

Francesca Federici, John Gunn

Research output: Contribution to journalArticle

2 Citations (Scopus)


Lorentz microscopy images of thin permalloy films reveal the presence of vortices stabilised by a normal magnetic field. The vortex structures are also accompanied by a complex domain wall pattern which is nucleated by the external field and is believed to be related to the shape anisotropy of the system. The non-planar nature of the film investigated is, in fact, the necessary condition for the observation of such phenomena. Through the interpretation of the micrographs, we analyse the energetics of the system by formulating a magnetic model which encapsulates the shape anisotropy of the sample. We show that the external field can induce instabilities in the system and the parameters estimated through our model are consistent with the experimental values. (C) 2001 Published by Elsevier Science B.V.
Original languageEnglish
Pages (from-to)1607-1609
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Publication statusPublished - 1 May 2001


  • thin films
  • instability
  • Lorentz microscopy
  • permalloy


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