Determination of magnetic vortex polarity from a single Lorentz Fresnel image

C. Phatak, M. Tanase, A. K. Petford-Long, M. De Graef*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Nanoscale confinement of the magnetization in a magnetic element often results in the creation of a vortex structure. The vortex equilibrium state is characterized by the curling of the in-plane magnetization (chirality) and an out-of-plane core magnetization. The polarity of the vortex core can point up or down, independent of the chirality, and, thus, magnetic elements with a vortex core are interesting as four-state logic elements. We present an easy-to-use, quantitative method for the determination of both chirality and polarity from a single Fresnel image. This method offers direct evidence of the three-dimensional structure of a magnetic vortex and has significant advantages over the more complex methods currently in use.

Original languageEnglish (US)
Pages (from-to)264-267
Number of pages4
Issue number3
StatePublished - Feb 2009


  • Lorentz transmission electron microscopy
  • Magnetic thin film
  • Vortex polarity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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