Focused ion beam milled CoPt magnetic force microscopy tips for high resolution domain images

L. Gao, L. P. Yue, T. Yokota, R. Skomski, S. H. Liou, H. Takahoshi, H. Saito, S. Ishio

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


High-coercivity CoPt magnetic force microscope tips have been modified by focused ion beam milling to improve the resolution of magnetic domain images. The magnetic materials around the apex have been removed, leaving a 30-nm diameter magnetic particle at the tip end. Due to the smaller amount of magnetic material, the stray field from this new tip is significantly reduced, and the spatial resolution of the magnetic domain images is improved. The tip is used to obtain high-resolution domain images of a CoCrPt-SiO2/Ru perpendicular recording medium with linear recording densities from 800 to 1000 kfci. Magnetic patterns of 900 kfci, corresponding to a bit size of 28 nm, are well resolved. From the analysis of the power spectrum of the track profiles for these images, a spatial resolution as good as 11 nm under ambient conditions with a commercial magnetic force microscope is achieved.

Original languageEnglish (US)
Pages (from-to)2194-2196
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number4 II
StatePublished - Jul 2004


  • Domain images
  • Focused ion beam technology
  • Magnetic force microscopy
  • Magnetic recording

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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