Effect of Heat-Treatment on the Magnetic Properties and Microstructure of Electroless-Plated Conip Films for Perpendicular Magnetic Recording

T. Homma, H. Asai, K. Ohrui, M. Araki, T. Osaka, Y. Yamazaki, T. Namikawa

研究成果: Article

抜粋

The effect of heat treatment on the magnetic properties and microstructure of electroless plated CoNiP films for use as perpendicular magnetic recording media was investigated, in order to clarify the film microstructure in the as deposited state, as well as to evaluate their thermal stability. The as-deposited film consisted of a mixture of <002> perpendicularly oriented hcp structure, and fcc structure without any obvious crystal orientation. Heat treatment at temperatures above 400°C changed the dominant crystal structure from hcp to fcc. The crystallites grow larger with heat treatment, causing a sharp change in magnetic properties. These changes were due to the disappearance of the magnetocrystalline anisotropy induced by the cobalt hep structure, and the decrease in the shape magnetic anisotropy due to the change in film topology. On the basis of these results, it is suggested that a compositional inhomogeneity due to the segregation of Co-rich regions exists in the as-deposited films; this segregation disappears with heat treatment at higher temperature, so that the crystal structure of the film changes to an fcc structure.

元の言語English
ページ(範囲)730-734
ページ数5
ジャーナルIEEE Translation Journal on Magnetics in Japan
7
発行部数9
DOI
出版物ステータスPublished - 1992 9

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Engineering(all)

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