Magnetic microstructure and noise property of electrolessly deposited CoNiFeB soft magnetic underlayer

Atsushi Sugiyama*, Ken Adachi, Manko Sakagami, Masahiro Yoshino, Jun Kawaji, Toru Asahi, Toshihiro Tsumori, Tetsuya Osaka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A CoNiFeB soft magnetic underlayer (SUL) was prepared by electroless deposition using dimethylamineborane as the reducing agent. A 2.5-inch NiP/Al disk was used as the substrate, on which a NiP nonmagnetic amorphous-layer was also electrolessly deposited. The coercivity Hc of as-deposited CoNiFeB films in the direction parallel to the surface exhibited a convex-parabolic dependency on the film thickness. The in-plane M-H loops and the two-dimensional Kerr effect images of the CoNiFeB film showed a nearly isotropic character with Hc of 25 Oe and no marked domain boundaries. From magnetic force microscope measurements, we confirmed that these behaviors resulted from the formation of striped magnetic domains caused by slightly perpendicular magnetic anisotropy of SUL. As far as the noise characteristics are concerned, dc noise was increased with Hc, while spike noise was suppressed.

Original languageEnglish
Pages (from-to)3163-3165
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 2005 Oct


  • CoNiFe
  • De noise
  • Electroless deposition
  • Soft magnetic imderlayer
  • Spike noise
  • Striped magnetic domain

ASJC Scopus subject areas

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


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