Experimental determination of ultra-sharp stray field distribution from a magnetic vortex core structure

Hai Zhong, Lei Huang, Dan Wei, Sumei Wang, Yimei Zhu, Jun Yuan

Research output: Contribution to journalLetterpeer-review


The fine magnetic stray field from a vortex structure of micron-sized permalloy (Ni80Fe20) elements has been studied by high-resolution magnetic force microscopy. By systematically studying the width of the stray filed gradient distribution at different tip-to-sample distances, we show that the half-width at half-maximum (HWHM) of the signal from vortex core can be as narrow as similar to 21 nm at a closest tip-to-sample distance of 23 nm, even including the convolution effect of the finite size of the magnetic tip, a weak circular reverse component is found around the center of the magnetic vortex in the measured magnetic force microscope (MFM) signals, which can be attributed to the reverse magnetization around the vortex core. Successive micromagnetic and MFM imaging simulations show good agreements with our experimental results on the width of the stray field distribution. (C) 2009 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)L37-L40
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Issue number15
Publication statusPublished - Aug 2009


  • Vortex core
  • MFM
  • Micromagnetic
  • TIP

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