Characterization of a thick Co-Cr perpendicular medium for a merged MR head

Y. Ikeda*, Y. Sonobe, H. Uchida, T. Toyooka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have been studying a single-layer Co-Cr perpendicular medium with a thickness of 100-700 nm, using a merged MR head designed for longitudinal recording. The Co78Cr22 medium shows good linearity in its output dependence on the MR bias current. The output is 50% larger than that for a longitudinal medium. A maximum D50 value of 100 kFCI was obtained for a medium with an optimum thickness of 300 nm. The medium noise increases with the medium thickness, whereas the output saturates at 300 nm. The thick medium has two demerits: large write demagnetization and a high level of medium noise. Increasing the Cr content of the Co-Cr medium from 22 to 28 at% significantly reduces these two problems. Cr-rich perpendicular media with thicknesses of over 100 nm are expected to replace longitudinal media in hard disk drives in the near future.

Original languageEnglish
Pages (from-to)13-19
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Issue number1
Publication statusPublished - 1997 Dec
Externally publishedYes


  • Demagnetization field
  • Magnetic recording head - magnetoresistive
  • Medium thickness
  • Perpendicular recording

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Characterization of a thick Co-Cr perpendicular medium for a merged MR head'. Together they form a unique fingerprint.

Cite this