Preparation of high magnetic flux density CoNiFeB film by electroless deposition for application to magnetic recording devices

M. Yoshino, Y. Kikuchi, A. Sugiyama, T. Osaka

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A CoNiFeB soft magnetic thin film with high saturation magnetic flux density (Bs) for use as a magnetic recording head core material or as a soft magnetic underlayer of a double perpendicular magnetic recording medium was prepared by electroless deposition. When the CoNiFeB alloy thin film was deposited on a evaporated Cu (100 nm thick)/glass substrate, the saturated magnetic flux density was found to increase up to 2.0 T by increasing the concentration of FeSO4. The coercivity (Hc) was found to decrease to 6 Oe while the saturated magnetic flux density was maintained higher than 1.8 T by optimizing the concentrations of tartaric acid and citric acid in the electroless plating solution. An X-ray diffraction (XRD) study showed that the intensity of the assigned peak in the bcc (1 1 0) of CoNiFeB film decreased as the concentration of tartaric acid was decreased. Moreover, the coercivity of the CoNiFeB film formed on a NiFe substrate exhibits lower coercivity than that formed on a Cu substrate.

Original languageEnglish
Pages (from-to)285-289
Number of pages5
JournalElectrochimica Acta
Issue number2
Publication statusPublished - 2007 Dec 1



  • Citric acid
  • CoNiFeB
  • Electroless deposition
  • Soft magnetic film
  • Tartaric acid

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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