Thermal stability and SNR of coupled granular/continuous media

Y. Sonobe*, D. Weller, Y. Ikeda, M. Schabes, K. Takano, G. Zeltzer, B. K. Yen, M. E. Best, S. J. Greaves, H. Muraoka, Y. Nakamura

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

41 Citations (Scopus)


We investigated coupled granular/continuous (CGC) perpendicular media consisting of a continuous multilayer for high thermal stability and a granular host layer to reduce noise. The addition of Co/Pt multilayers increased the nucleation field of the CoCr18Pt12 medium from 0 to -2000 Oe. Moreover, the moment decay was reduced from 4.8% to 0.1% per decade. Compared to Co/Pd multilayer media, the CGC medium had a 10 dB higher signal-to-noise ratio (SNR). The granular host layer significantly improved the SNR in the high-density region over 10 kfc/mm. Compared to the CoCr20Pt10 medium, the CGC medium had a 3 dB higher SNR in the low-density region. The medium noise for the CGC medium increased with the recording density, while the noise for the CoCr20Pt10 medium remained constant from 10 to 20 kfc/mm. The approach using CGC medium improves both the SNR and the thermal stability.

Original languageEnglish
Pages (from-to)1667-1670
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number4 I
Publication statusPublished - 2001 Jul
Externally publishedYes
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11


  • Continuous layer
  • Granular layer
  • Perpendicular media
  • Signal-to-noise ratio
  • Thermal stability

ASJC Scopus subject areas

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


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