Low noise FeAlSi soft magnetic under-layer for CoPtCrO double-layered perpendicular recording media

Takashi Hikosaka, Futoshi Nakamura, Souichi Oikawa, Akihiko Takeo, Yoichiro Tanaka

Research output: Contribution to journalConference article

17 Citations (Scopus)

Abstract

FeAlSi multi-layered structure successfully reduced the noise compared with a mono-layered film. Optical surface analyzer also revealed that the films did not show any clear magnetic domains of spike noise source in the whole disk. TEM image of low noise film showed wide grain boundaries between 200 to 500 nm diameter FeAlSi grain clusters. The coercivities of films were significantly reduced when they were laminated. Along with the cluster isolation effect, the interlayer magnetic coupling of the multi-layered FeAlSi films also effectively reduce the noise. Double-layered perpendicular medium with a CoPtCrO recording layer and a multi-layered FeAlSi soft under-layer showed 25.8 dB SNR at 400 kBPI and 0.36 μm read truck width, and 2.5 × 10-7 BER on a spin stand was achieved.

Original languageEnglish
Pages (from-to)1586-1588
Number of pages3
JournalIEEE Transactions on Magnetics
Volume37
Issue number4 I
DOIs
Publication statusPublished - 2001 Jul 1
Externally publishedYes
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11

Keywords

  • Magnetic devices
  • Magnetic films
  • Magnetic noise
  • Magnetic recording
  • Perpendicular magnetic

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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