Demonstration of ultra-high-resolution MFM images using Co90Fe10-coated CNT probes

Sang Jun Choi, Ki Hong Kim, Young Jin Cho, Hu san Lee, Soo haeng Cho, Soon Ju Kwon, Jung hwan Moon, Kyung Jin Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We demonstrate ultra-high-resolution magnetic force microscopy images of perpendicular magnetic storage media using carbon nanotube probes coated by ferromagnetic Co90Fe10 films (20, 30, 40, and 50 nm). By optimizing ferromagnetic film thickness (effective tip diameter), we obtained best magnetic domain image with an 40 nm-Co90Fe10-coated tip (50 nm tip diameter) about a lateral detect density of 1200 k flux per inch on perpendicular magnetic storage medium, one of the highest resolutions in MFM imaging reported for this material system and structure. The observed dependence of tip dimension on signal contrast and image resolution was successfully explained by a theoretical analysis indicating that the signal contrast, along with the physical probe-tip dimension, should be taken into account to design magnetic probes tips for high-resolution magnetic force microscopy.

Original languageEnglish
Pages (from-to)332-336
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume322
Issue number3
DOIs
Publication statusPublished - 2010 Feb

Keywords

  • CNT probe
  • CoFe
  • FCI
  • MFM
  • Magnetization value

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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