Correlation between activation volume and intergranular magnetic interaction in longitudinal media

M. Mikami, D. D. Djayaprawira, T. K. Kong, S. Yoshimura, A. Horii, M. Takahashi

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)


We have investigated the correlation between activation grain diameter derived from activation volume and intergranular magnetic interaction, in CoCrPt-based thin film media fabricated by ultra clean sputtering process. As the results, we found that activation grain diameter depends on the physical grain diameter and intergranular exchange interaction, but is independent of intergranular magnetostatic interaction (4πMs/Hkgrain). The activation grain diameter normalized by physical grain diameter, which corresponds with normalized coercivity (Hc/Hkgrain) and microstructure, well indicate the character of intergranular exchange interaction in the media with various compositions. It is also clarified that the media noise can be characterized by activation grain diameter together with intergranular magnetostatic interaction.

Original languageEnglish
Pages (from-to)1484-1487
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


  • Activation volume
  • Exchange interaction
  • Longitudinal media
  • Thin film

ASJC Scopus subject areas

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


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