On the segregation and magnetic properties of electroless-plated CoNiReP perpendicular anisotropic films

Tetsuya Osaka, H. Matsubara, M. Toda, Takayuki Homma

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The segregation structure of electroless-plated CoNiReP alloy films for perpendicular magnetic recording media was investigated, and the origin of coercivity variation at the initial deposition is discussed. Two types of films were used, i.e., film A had a low perpendicular coercivity, Hc(⊥), of several hundred Oe at a thin region less than 0.1 μm, while film B had a high Hc(⊥) of over 1.4 kOe at the region. Although a value of saturation magnetization, Ms, indicating segregation of magnetic components, was different for each of the as-plated films, the Ms value was almost the same after a 400°C heat-treatment. This is assumed to be due to the occurrence of crystallization and segregation in the films with heat-treatment, and also because the same segregated structure was attained in the two films. In the case of the very thin 0.1 μm film, a larger change of Ms value in film A was observed than in the 0.5 μm film. Thus, the higher degree of segregation was assumed in the thinner region of film B.

Original languageEnglish
Pages (from-to)2637-2639
Number of pages3
JournalJournal of the Electrochemical Society
Volume136
Issue number9
Publication statusPublished - 1989 Sep

Fingerprint

Magnetic properties
magnetic properties
Coercive force
coercivity
heat treatment
Heat treatment
Magnetic recording
magnetic recording
Saturation magnetization
Crystallization
occurrences
crystallization
saturation
magnetization

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

On the segregation and magnetic properties of electroless-plated CoNiReP perpendicular anisotropic films. / Osaka, Tetsuya; Matsubara, H.; Toda, M.; Homma, Takayuki.

In: Journal of the Electrochemical Society, Vol. 136, No. 9, 09.1989, p. 2637-2639.

Research output: Contribution to journalArticle

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N2 - The segregation structure of electroless-plated CoNiReP alloy films for perpendicular magnetic recording media was investigated, and the origin of coercivity variation at the initial deposition is discussed. Two types of films were used, i.e., film A had a low perpendicular coercivity, Hc(⊥), of several hundred Oe at a thin region less than 0.1 μm, while film B had a high Hc(⊥) of over 1.4 kOe at the region. Although a value of saturation magnetization, Ms, indicating segregation of magnetic components, was different for each of the as-plated films, the Ms value was almost the same after a 400°C heat-treatment. This is assumed to be due to the occurrence of crystallization and segregation in the films with heat-treatment, and also because the same segregated structure was attained in the two films. In the case of the very thin 0.1 μm film, a larger change of Ms value in film A was observed than in the 0.5 μm film. Thus, the higher degree of segregation was assumed in the thinner region of film B.

AB - The segregation structure of electroless-plated CoNiReP alloy films for perpendicular magnetic recording media was investigated, and the origin of coercivity variation at the initial deposition is discussed. Two types of films were used, i.e., film A had a low perpendicular coercivity, Hc(⊥), of several hundred Oe at a thin region less than 0.1 μm, while film B had a high Hc(⊥) of over 1.4 kOe at the region. Although a value of saturation magnetization, Ms, indicating segregation of magnetic components, was different for each of the as-plated films, the Ms value was almost the same after a 400°C heat-treatment. This is assumed to be due to the occurrence of crystallization and segregation in the films with heat-treatment, and also because the same segregated structure was attained in the two films. In the case of the very thin 0.1 μm film, a larger change of Ms value in film A was observed than in the 0.5 μm film. Thus, the higher degree of segregation was assumed in the thinner region of film B.

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