Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots

V. Novosad, K. Yu Guslienko, H. Shima, Y. Otani, K. Fukamichi, N. Kikuchi, O. Kitakami, Y. Shimada

Research output: Contribution to journalConference articlepeer-review

51 Citations (Scopus)


The magnetization reversal processes in Fe20 Ni80 dot arrays have been studied both experimentally and theoretically. The circular-shaped dots with thickness of 60 nm and variable diameters of 0.2-0.8 μm were fabricated by using electron-beam lithography and lift-off technique. A size dependent vortex nucleation, annihilation and initial susceptibility were determined from magneto-optical hysteresis loops. With increasing dot diameter the nucleation and annihilation fields decrease, whereas the initial susceptibility exhibits a linear increase. The experimental data were compared to the results of analytical calculations taking into account magnetostatic interactions, exchange and Zeeman energies for a planar arty of magnetically soft circular dots.

Original languageEnglish
Pages (from-to)2088-2090
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number4 I
Publication statusPublished - 2001 Jul
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11


  • Circular dots
  • Magnetic vortex
  • Permalloy
  • Vortex nucleation and annihilation


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