Potential of metallic glass thin films as a soft magnetic underlayer for L10 FePt-based recording media

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Abstract

We report on the use of metallic glass (FeHfNbYB) thin film as a soft magnetic underlayer for the fabrication of L10 FePt-based bit patterned recording media (BPM). Preferred oriented phase of L10 (111) FePt is obtained either by depositing it in situ on a heated soft magnetic metallic glass/SiO2Si or at room temperature (FePt/metallic glass/SiO2Si) followed by annealing at 400°C-450°C for 20 min. Fabrication of recoding bits of size ∼2μm to 20 nm is demonstrated using electron beam lithography. Magnetic measurements on ∼500nm bit patterns show a narrow switching field (SF) distribution with SF of ∼3kOe. The ability to read/write this BPM is demonstrated with a commercial head in perpendicular geometry in a static tester. Results strongly suggest that the soft magnetic metallic glass thin films can solve the problem of writability in high anisotropy L10 FePt-based recording media.

Original languageEnglish
Article number6786377
JournalIEEE Transactions on Magnetics
Volume50
Issue number4
DOIs
Publication statusPublished - 2014 Apr 1

Keywords

  • Amorphous magnetic materials
  • Magnetic domains
  • Perpendicular magnetic anisotropy
  • Perpendicular magnetic recording
  • Soft magnetic materials

ASJC Scopus subject areas

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

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