Magnetization reversal process of hard/soft nano-composite structures formed by ion irradiation

M. Aniya*, A. Shimada, Y. Sonobe, K. Sato, T. Shima, K. Takanashi, Simon J. Greaves, T. Ouchi, T. Homma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Discrete track media (DTM) and bit-patterned media (BPM) are being extensively studied as routes to achieve higher density hard disk drives. In the DTM and BPM, it is essential to isolate the data tracks or bits with non-magnetic materials to reduce the magnetic noise from adjacent tracks or bits. In contrast to the conventional procedure of physically etching the media, we attempted to isolate the tracks or bits with soft regions using an area-selective ion irradiation method. We prepared hard and soft nano-composite structures by nanoimprinting, followed by ion irradiation. In this study, we confirmed the magnetic reversal process of the hard and soft regions of the nano-composite structure using magnetic force microscopy (MFM) with various external applied magnetic fields. The analysis of the magnetization reversal process 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 number5467376
Pages (from-to)2132-2135
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number6
Publication statusPublished - 2010 Jun


  • CGC films
  • Discrete-track media
  • Exchange coupling
  • Ion irradiation
  • Magnetic modification
  • Patterned media

ASJC Scopus subject areas

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


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