Magnetic properties of patterned cgc perpendicular films with soft magnetic fillings

M. Aniya, A. Mitra, A. Shimada, Y. Sonobe, T. Ouchi, Simon J. Greaves, T. Homma

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


To increase the areal density of hard disk drives (HDDs), discrete track media (DTM) and bit-patterned media (BPM) are being extensively studied. In the DTM and BPM, it is essential to isolate data tracks or bits. Unlike isolating the data tracks or bits using the conventional procedure involving physical etching, we attempted to isolate the tracks or bits with a soft guard band using an area-selective ion irradiation method. We prepared hard and soft (H/S) patterned films by nanoimprinting followed by ion irradiation. We confirmed the magnetic isolation of tracks and bits using magnetic force microscopy (MFM) images and magnetooptical Kerr effect (MOKE) signals. The results of an analysis of the magnetic properties of patterned coupled granular continuous (CGC) films with weak exchange coupling confirmed the validity of this novel approach for the fabrication of DTM and BPM.

Original languageEnglish
Article number5257057
Pages (from-to)3539-3542
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 2009 Oct


  • Discrete-track media
  • Exchange coupling
  • Index Terms-Coupled granular continuous (CGC) films
  • Ion irradiation
  • Magnetic modification
  • Patterned media

ASJC Scopus subject areas

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


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