Phase diagram for magnetic nano-rings

M. Beleggia, J. W. Lau, M. A. Schofield, Y. Zhu, S. Tandon, M. De Graef

Research output: Contribution to journalJournal articleResearchpeer-review


The minimum-energy single-domain magnetization state in a magnetized nano-ring is determined as a function of material and shape parameters. A phase diagram is derived within the framework of a Fourier-space approach for magnetic computations, showing the expected position of the ground state for any given set of external degrees of freedom. A series of micromagnetic simulations for suitably chosen parameters, show excellent agreement with the obtained theoretical results. An electron holography experiment has been carried out as a test on phase diagram reliability. The validity of the treatment, in particular the simplification employed in choosing ideal uniform rather than more physical quasi-uniform single-domain states, is thoroughly discussed in order to establish clear boundaries of applicability of the phase diagram.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Issue number1
Pages (from-to)131-146
Number of pages16
Publication statusPublished - 2006
Externally publishedYes


  • Magnetic nano-particles
  • Phase diagram
  • Magnetostatic energy
  • Micromagnetic simulations
  • Electron holography


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