Recording Characteristics of Electroless-plated CoNiReP/NiWP Double Layers

H. Matsubara, S. Mitamura, K. Noda, T. Osaka, F. Goto

Research output: Contribution to journalArticlepeer-review


Electroless-plated CoNiReP/NiWP double layer films were investigated for perpendicular magnetic recording media as flexible disks. The magnetic properties of a CoNiReP recording layer, such as a saturation magnetization (Ms) value and squareness ratio of perpendicular hysteresis loops (SQR (⊥)), were changed by NiWP underlayers. The reproduced output voltage of CoNiReP/NiWP flexible disks at low recording density with a ring-type head increased with Ms values of recording layer and underlayer. Moreover, the D50 value of 112 kFRPI was attained by the highest SQR(⊥) medium of the double layer evaluated with a 0.20μm gap length sendust ring-type head. This may be mainly due to large perpendicular anisotropy of the top region of recording layer which is improved by the underlayer addition.

Original languageEnglish
Pages (from-to)276-281
Number of pages6
JournalIEEE Translation Journal on Magnetics in Japan
Issue number3
Publication statusPublished - 1990 Mar

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Engineering(all)


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