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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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
Volume41
Issue number10
DOIs
Publication statusPublished - 2005 Oct

Fingerprint

Magnetic domains
microstructure
Microstructure
Electroless plating
Magnetic anisotropy
Reducing Agents
Reducing agents
Coercive force
Film thickness
electroless deposition
Microscopes
magnetic domains
Kerr effects
spikes
coercivity
film thickness
Substrates
microscopes
anisotropy
Direction compound

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Magnetic microstructure and noise property of electrolessly deposited CoNiFeB soft magnetic underlayer. / Sugiyama, Atsushi; Adachi, Ken; Sakagami, Manko; Yoshino, Masahiro; Kawaji, Jun; Asahi, Toru; Tsumori, Toshihiro; Osaka, Tetsuya.

In: IEEE Transactions on Magnetics, Vol. 41, No. 10, 10.2005, p. 3163-3165.

Research output: Contribution to journalArticle

Sugiyama, Atsushi ; Adachi, Ken ; Sakagami, Manko ; Yoshino, Masahiro ; Kawaji, Jun ; Asahi, Toru ; Tsumori, Toshihiro ; Osaka, Tetsuya. / Magnetic microstructure and noise property of electrolessly deposited CoNiFeB soft magnetic underlayer. In: IEEE Transactions on Magnetics. 2005 ; Vol. 41, No. 10. pp. 3163-3165.
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