Perpendicular magnetic recording process of electroless-plated CoNiReP/NiFeP double-layered media with ring-type heads

Tetsuya Osaka, Takayuki Homma, Kazuhiro Noda, Toshihiko Watanabe, Fumio Goto

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Electroless-plated CoNiReP/NiFeP double-layered (DL) media with various underlayer coercivities (Hc(u)) were examined to study perpendicular recording performance using ring-type heads. For the case of a DL medium with a combination of ring-type heads, it is found that the enhancement of the reproduced voltage by the phase synchronization (PS) effect is significantly influenced by varying the perpendicular layer thickness (δp) and head parameters. In the recording performance using a Mn-Zn ferrite head, the reproduced voltage is drastically enhanced by the PS effect as far as the head field penetrates sufficiently into the bottom of the DL media and magnetizes the underlayer, and the reproduced voltage for the DL medium with Hc(u) = 160 Oe is higher than that for the DL medium with Hc(u) = 50 Oe. However, such an effect became obscured with an increase in δp, and in turn the DL medium with lower Hc(u) value demonstrated higher reproduced voltage than that of the DL medium with Hc(u) = 160 Oe, due to the double layer effect. In the case of using a metal-in-gap head with Bs = 15 kG, the penetration of the head field was further improved, sufficiently magnetizing the underlayer, and the DL medium with even thicker δp (0.3 μm) and higher Hc(u) (160 Oe) showed higher reproduced voltage over 240 nVp-p due to the PS effect.

Original languageEnglish
Pages (from-to)4963-4965
Number of pages3
JournalIEEE Transactions on Magnetics
Volume27
Issue number6 pt 2
DOIs
Publication statusPublished - 1991 Nov

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Magnetic recording
magnetic recording
rings
Electric potential
Synchronization
synchronism
high voltages
Coercive force
electric potential
recording
Ferrite
Metals
coercivity
far fields
ferrites
penetration
augmentation
metals

ASJC Scopus subject areas

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

Cite this

Perpendicular magnetic recording process of electroless-plated CoNiReP/NiFeP double-layered media with ring-type heads. / Osaka, Tetsuya; Homma, Takayuki; Noda, Kazuhiro; Watanabe, Toshihiko; Goto, Fumio.

In: IEEE Transactions on Magnetics, Vol. 27, No. 6 pt 2, 11.1991, p. 4963-4965.

Research output: Contribution to journalArticle

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