Observation of stray fields from hard-disk writer poles up to 2 GHz

M. R. Koblischka, J. D. Wei, T. Sulzbach, A. D. Johnston, U. Hartmann

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


By means of high-frequency magnetic force microscope (HF-MFM) the emanating stray fields from hard-disk writer poles are measured at carrier frequencies up to 2 GHz. For the present measurements, hard-disk writer poles stemming from SEAGATE were employed. At 1000 MHz and above, the field directly at the gap is dominating, while the fields along the downtrack direction are found to decrease. The observation of the stray fields at these high frequencies is only possible by employing MFM cantilevers with a 50-nm-thick (Ni,Zn)-ferrite coating. We show that the use of these tips gives much larger signal than those obtained by conventional CoCr-coated cantilevers.

Original languageEnglish
Pages (from-to)2205-2207
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number6
Publication statusPublished - 2007 Jun
Externally publishedYes


  • Frequency characteristics
  • Hard-disk write head
  • High-frequency measurement
  • Magnetic force microscope

ASJC Scopus subject areas

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


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