ATTEMPT ON CONTROL OF PERPENDICULAR COERCIVITY TOWARD FILM THICKNESS DIRECTION OF ELECTROLESS PLATED COBALT ALLOY FILMS FOR PERPENDICULAR MAGNETIC RECORDING.

Tetsuya Osaka, I. Koiwa, M. Toda, T. Sakuma, Y. Yamazaki, T. Namikawa, F. Goto

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Electroless-plated CoNiReP alloy films with perpendicular magnetic anisotropy were studied from the standpoint of controlling the magnetic properties at the very thin initial deposition stage. Thickness dependence of perpendicular coercivity, Hc( PERPEND ), was controlled by adjusting the sodium malonate concentration in the bath. The higher sodium malonate concentration made the Hc( PERPEND ) values at the 0. 1- mu m-thick initial deposition stage higher; however, at thickness geater than 0. 5 mu m, the Hc( PERPEND ) values were almost the same independent of sodium malonate concentration. Recording performance on these disk was evaluated by using Winchester ring-heads under 0. 17 mu s head-to-medium spacing. D//5//0 values somewhat depended on the sodium malonate concentration; 0. 25- mu m-thick disk plate at 0. 50 mol/l sodium malonate gave the highest D//5//0 value of 64 kFRPI using an 0. 23- mu m gap length head. Overwrite values were affected by the sodium malonate concentration; the highest values of minus 30 dB were attained at the 0. 25- mu m disk plated at 0. 30 mol/l sodium malonate using 0. 53- mu m head gap length. Media having the lower Hc( PERPEND ) at the initial deposition stage gave preferable conditions for the read/write characteristics, especially overwrite, of perpendicular recording when using a Mn-Zn ferrite ring-head.

Original languageEnglish
JournalIEEE Transactions on Magnetics
VolumeMAG-22
Issue number5
Publication statusPublished - 1986 Sep

Fingerprint

cobalt alloys
Cobalt alloys
Magnetic recording
magnetic recording
Coercive force
coercivity
Film thickness
film thickness
Sodium
sodium
recording
Magnetic anisotropy
rings
malonic acid
Direction compound
Ferrite
ferrites
baths
Magnetic properties
adjusting

ASJC Scopus subject areas

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

Cite this

ATTEMPT ON CONTROL OF PERPENDICULAR COERCIVITY TOWARD FILM THICKNESS DIRECTION OF ELECTROLESS PLATED COBALT ALLOY FILMS FOR PERPENDICULAR MAGNETIC RECORDING. / Osaka, Tetsuya; Koiwa, I.; Toda, M.; Sakuma, T.; Yamazaki, Y.; Namikawa, T.; Goto, F.

In: IEEE Transactions on Magnetics, Vol. MAG-22, No. 5, 09.1986.

Research output: Contribution to journalArticle

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abstract = "Electroless-plated CoNiReP alloy films with perpendicular magnetic anisotropy were studied from the standpoint of controlling the magnetic properties at the very thin initial deposition stage. Thickness dependence of perpendicular coercivity, Hc( PERPEND ), was controlled by adjusting the sodium malonate concentration in the bath. The higher sodium malonate concentration made the Hc( PERPEND ) values at the 0. 1- mu m-thick initial deposition stage higher; however, at thickness geater than 0. 5 mu m, the Hc( PERPEND ) values were almost the same independent of sodium malonate concentration. Recording performance on these disk was evaluated by using Winchester ring-heads under 0. 17 mu s head-to-medium spacing. D//5//0 values somewhat depended on the sodium malonate concentration; 0. 25- mu m-thick disk plate at 0. 50 mol/l sodium malonate gave the highest D//5//0 value of 64 kFRPI using an 0. 23- mu m gap length head. Overwrite values were affected by the sodium malonate concentration; the highest values of minus 30 dB were attained at the 0. 25- mu m disk plated at 0. 30 mol/l sodium malonate using 0. 53- mu m head gap length. Media having the lower Hc( PERPEND ) at the initial deposition stage gave preferable conditions for the read/write characteristics, especially overwrite, of perpendicular recording when using a Mn-Zn ferrite ring-head.",
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