An Advanced Magneto-Resistive Head with a Newly Developed Electroplated High-B s Write Pole

Hiroshi Gokan, Kaoru Toki, Keishi Ohashi, Takao Maruyama, Mitsuo Abe, Susumu Mizuno

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A Magneto-Resistive (MR) head with a newly developed electroplated high-B s CoNiFe write pole has been developed for use in Hard Disk Drives (HDDs). The electroplated film has the leading high saturation magnetization (B s) of 2.1 T to provide a soft magnetic film suitable for the write element in MR heads. Introducing high-B s films for the write-pole improves overwrite performance in 2,950 Oe high-H c media by 17.7 dB. For the read element, a large exchange coupling NiMn film has been developed. This film provides an excellent biasing scheme for fabricating abutted junction structure and the overlay structure. Signal stability evaluated by maximum asymmetry change during repeated read/write operations is improved by optimizing the write-core design and the magnetostriction of the magnetic layers as well as by optimizing the biasing scheme. Altitude sensitivity, which is defined as the change in flying height when atmospheric pressure is reduced from 1.0 to 0.7 atm, is suppressed from 11 to 5 nm by modifying the ABS (Air-Bearing Surface) design to increase the negative pressure induced. Typical read/write characteristics of MR heads with high-B s write-pole designed for 2.6 Gb/in 2 areal-density recording are described. An output-signal voltage of 400 μV/μm with excellent signal stability has been obtained.

Original languageEnglish
Pages (from-to)309-315
Number of pages7
JournalNEC Research and Development
Volume39
Issue number3
Publication statusPublished - 1998 Jul 1

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Keywords

  • Altitude insensitivity
  • CoNiFe
  • HDD (Hard Disk Drive)
  • Inductive head
  • MR head structure
  • Magneto-Resistive (MR) head
  • Saturation magnetization
  • Signal instability
  • Slider

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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