Analysis on magnetization transition of CGC perpendicular media

H. Muraoka*, Y. Sonobe, K. Miura, A. M. Goodman, Y. Nakamura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Modeling and read/write characteristics of coupled granular/continuous (CGC) perpendicular recording media are described. The media consists of a continuous layer with a strong in-plain exchange coupling and a granular layer with magnetically isolated grain structure. The two layers are coupled by interlayer exchange coupling. Hysteresis loop squareness approaching unity is realized in CGC samples with only a 3-6 nm continuous layer on a CoCrPt granular layer. An approximated energy calculation shows a domain-wall pinning effect and transition smoothing due to interlayer exchange coupling between the two layers. Read/write measurements for the CGC media indicate signal-to-noise ratio improvement in association with transition jitter reduction, which suggests transition smoothing. Thermal stability is improved by interlayer exchange interaction.

Original languageEnglish
Pages (from-to)1632-1636
Number of pages5
JournalIEEE Transactions on Magnetics
Issue number4 I
Publication statusPublished - 2002 Jul
Externally publishedYes


  • CGC media
  • Media noise
  • Perpendicular magnetic recording
  • Thermal stability
  • Transition jitter

ASJC Scopus subject areas

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


Dive into the research topics of 'Analysis on magnetization transition of CGC perpendicular media'. Together they form a unique fingerprint.

Cite this