Electrochemical formation of intermediate layer for Co/Pd multilayered media

Jun Kawaji, Koji Kimura, Toru Asahi, Takayuki Homma, Tetsuya Osaka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Pd nanocluster seeds were formed on a soft magnetic underlayer (SUL) using an electrochemical substitution reaction, and were utilized as an intermediate layer for a Co/Pd multilayered ([Co/Pd]n) perpendicular magnetic recording medium. A CoNiFeB film prepared with electroless deposition was used as SUL, which was immersed into a PdCl2 solution for the formation of Pd seeds. The Pd seeds were found to effectively reduce the size of magnetic domains in the [Co/Pd]n film deposited on them. The optimization of the concentration of the PdCl2 solution and the use of the pretreatment process with a SnCl2 solution were effective to obtain the smooth SUL surface with fine Pd seeds as small as 5 nm. The 20 nm-thick [Co/Pd]n film deposited on the optimized Pd seeds/CoNiFeB SUL exhibited a high coercivity of 7.8 kOe and a small magnetic domain size of 69 nm. These results indicated that the combination of the Pd seeds and the electroless-deposited SUL was desirable in terms of the improvement not only in the magnetic properties of [Co/Pd]n media but also in the mass productivity of the underlayer.

Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume303
Issue number2 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Aug

Fingerprint

Seed
seeds
Magnetic domains
magnetic domains
electroless deposition
Magnetic recording
Nanoclusters
Electroless plating
magnetic recording
Coercive force
nanoclusters
productivity
pretreatment
coercivity
Magnetic properties
Substitution reactions
Productivity
substitutes
magnetic properties
optimization

Keywords

  • Co/Pd multilayered film
  • Electrochemical process
  • Intermediate layer
  • Pd seeds
  • Perpendicular magnetic recording media
  • Soft magnetic underlayer

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electrochemical formation of intermediate layer for Co/Pd multilayered media. / Kawaji, Jun; Kimura, Koji; Asahi, Toru; Homma, Takayuki; Osaka, Tetsuya.

In: Journal of Magnetism and Magnetic Materials, Vol. 303, No. 2 SPEC. ISS., 08.2006.

Research output: Contribution to journalArticle

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AU - Kimura, Koji

AU - Asahi, Toru

AU - Homma, Takayuki

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AB - Pd nanocluster seeds were formed on a soft magnetic underlayer (SUL) using an electrochemical substitution reaction, and were utilized as an intermediate layer for a Co/Pd multilayered ([Co/Pd]n) perpendicular magnetic recording medium. A CoNiFeB film prepared with electroless deposition was used as SUL, which was immersed into a PdCl2 solution for the formation of Pd seeds. The Pd seeds were found to effectively reduce the size of magnetic domains in the [Co/Pd]n film deposited on them. The optimization of the concentration of the PdCl2 solution and the use of the pretreatment process with a SnCl2 solution were effective to obtain the smooth SUL surface with fine Pd seeds as small as 5 nm. The 20 nm-thick [Co/Pd]n film deposited on the optimized Pd seeds/CoNiFeB SUL exhibited a high coercivity of 7.8 kOe and a small magnetic domain size of 69 nm. These results indicated that the combination of the Pd seeds and the electroless-deposited SUL was desirable in terms of the improvement not only in the magnetic properties of [Co/Pd]n media but also in the mass productivity of the underlayer.

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KW - Perpendicular magnetic recording media

KW - Soft magnetic underlayer

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