Thermal agitation of magnetization and recording performance of Co(B)-Pd superlattice perpendicular recording media

T. Shimatsu, M. Terakawa, I. Watanabe, H. Muraoka, Y. Nakamura

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

Magnetie properties and recording performance are discussed for Co-Pd(1 nm)]9 and [(Co-27 at% B)/Pd(1 nm)]9 superlattice perpendicular recording media as a function of the Co or Co-B layer thickness δCo or δCoB. The Co-Pd media shows large values of perpendicular anisotropy Ku of 5.7 × 106 erg/cm3Co =∼ 0.25 nm) and KuVact/kT of more than 200 (δCo > 0.3 nm), indicating a high potential to resist thermal instability (Vact; the activation volume k; the Boltzmann constant T; the absolute temperature). However, the thickness dependenee of KuVact/kT was not simply coincident with that of Ku. Magnetie characterization reveals that intergranluar exchange coupling deereases as the δCo or δCoB decreases, leading to higher signal-to-medium-noise ratio SNmR. The addition of B to Co layer reduces the values of Ku and KuVact/kT significantly, however, and is effective to reduce intergranluar exchange coupling and activation volume, resulting in higher SNmR.

Original languageEnglish
Pages (from-to)2048-2050
Number of pages3
JournalIEEE Transactions on Magnetics
Volume38
Issue number5 I
DOIs
Publication statusPublished - 2002 Sep 1
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2

Keywords

  • Activation volume
  • Co(B)-Pd snperlattice media
  • Media noise
  • Perpendicular recording medium
  • Thermal agitation of magnetization

ASJC Scopus subject areas

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

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