Effect of heat-treatment on the magnetic properties and microstructure of electroless-plated CoNiP films for perpendicular magnetic recording

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

Research output: Contribution to journalArticle

Abstract

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 hcp 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 temperatures, so that the crystal structure of the film changes to an fcc structure.

Original languageEnglish
Pages (from-to)730-734
Number of pages5
JournalIEEE translation journal on magnetics in Japan
Volume7
Issue number9
DOIs
Publication statusPublished - 1992 Sep

Fingerprint

Magnetic recording
Magnetic properties
Heat treatment
Microstructure
Crystal structure
Magnetocrystalline anisotropy
Magnetic anisotropy
Crystallites
Crystal orientation
Cobalt
Thermodynamic stability
Topology
Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Effect of heat-treatment on the magnetic properties and microstructure of electroless-plated CoNiP films for perpendicular magnetic recording. / Homma, Takayuki; Asai, H.; Ohrui, K.; Araki, M.; Osaka, Tetsuya; Yamazaki, Y.; Namikawa, T.

In: IEEE translation journal on magnetics in Japan, Vol. 7, No. 9, 09.1992, p. 730-734.

Research output: Contribution to journalArticle

@article{ab9f6a34d486465081c05acd7abc7250,
title = "Effect of heat-treatment on the magnetic properties and microstructure of electroless-plated CoNiP films for perpendicular magnetic recording",
abstract = "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 hcp 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 temperatures, so that the crystal structure of the film changes to an fcc structure.",
author = "Takayuki Homma and H. Asai and K. Ohrui and M. Araki and Tetsuya Osaka and Y. Yamazaki and T. Namikawa",
year = "1992",
month = "9",
doi = "10.1109/TJMJ.1992.4565483",
language = "English",
volume = "7",
pages = "730--734",
journal = "IEEE translation journal on magnetics in Japan",
issn = "0882-4959",
number = "9",

}

TY - JOUR

T1 - Effect of heat-treatment on the magnetic properties and microstructure of electroless-plated CoNiP films for perpendicular magnetic recording

AU - Homma, Takayuki

AU - Asai, H.

AU - Ohrui, K.

AU - Araki, M.

AU - Osaka, Tetsuya

AU - Yamazaki, Y.

AU - Namikawa, T.

PY - 1992/9

Y1 - 1992/9

N2 - 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 hcp 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 temperatures, so that the crystal structure of the film changes to an fcc structure.

AB - 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 hcp 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 temperatures, so that the crystal structure of the film changes to an fcc structure.

UR - http://www.scopus.com/inward/record.url?scp=0026922978&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026922978&partnerID=8YFLogxK

U2 - 10.1109/TJMJ.1992.4565483

DO - 10.1109/TJMJ.1992.4565483

M3 - Article

AN - SCOPUS:0026922978

VL - 7

SP - 730

EP - 734

JO - IEEE translation journal on magnetics in Japan

JF - IEEE translation journal on magnetics in Japan

SN - 0882-4959

IS - 9

ER -