Effect of Tartronic Acid on Magnetic Properties of Electroless Plated Co-Ni-Re-P Alloy Films for a Perpendicular Recording Medium

I. Koiwa, Y. Okabe, H. Matsubara, T. Osaka, F. Goto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Electroless plated Co-Ni-Re-P alloy films for use as perpendicular magnetic recording media were studied. It was found that the addition of tartronic acid to the plating bath makes it possible to form Co-Ni-Re-P perpendicular anisotropic films with no MnSO4 present. Co-Ni-Re-P alloy films, with a composition simpler than that of previously developed Co-Ni-Re-Mn-P films, has a greater potential than do the latter for practical use as perpendicular recording media. The read/write characteristics of 8-inch disks employing Co-Ni-Re-P films were also measured, in combination with a ring head. Characteristics almost equal to those of media containing Mn were obtained, and even higher recording densities are expected, given improved matching of head and disk properties. A recording density of D50 = 54 kFRPI was obtained for a 0.2 micron thick medium, using a 0.33 micron gap ring head and with a 0.12 micron head-medium spacing.

Original languageEnglish
Pages (from-to)443-449
Number of pages7
JournalIEEE Translation Journal on Magnetics in Japan
Volume1
Issue number4
DOIs
Publication statusPublished - 1985 Jul

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Engineering(all)

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