Novel soft-magnetic underlayer of a bit-patterned media using CoFe-based amorphous alloy thin film

Kana Takenaka, Noriko Saidoh, Nobuyuki Nishiyama, Manabu Ishimaru, Akihisa Inoue

Research output: Contribution to journalArticle

Abstract

With the aim of applying to a soft-magnetic underlayer of the new type of bit-patterned media using nano-patterned glassy alloy thin film, (CoFe)-B-Si-Nb alloy thin films were deposited on a Si substrate by a DC magnetron sputtering method. The deposited thin films with the compositions of Co 77Fe 5B 15Si 2Nb 1 and Co 75Fe 5B 14Si 5Nb 1 were confirmed as a fully amorphous structure. The obtained Co 77Fe 5B 15Si 2Nb 1 amorphous alloy thin film containing lower metalloid content exhibits extremely smooth surface and good soft-magnetic properties such as high saturation flux density of 1.2 T, in-plane low coercivity of 36 A/m, nearly zero-magnetostriction of 4 × 10 -7 and high real part of permeability of 870 at 291 MHz, suggesting that the film is appropriate for the soft-magnetic underlayer. Moreover, a prototype bit-patterned media was prepared by utilizing the obtained thin film as a soft-magnetic underlayer. As a result of static tester measurements with a commercial perpendicular magnetic head, accurate information reading and writing on the prototype bit-patterned media were confirmed. It is therefore said that the Co 77Fe 5B 15Si 2Nb 1 amorphous alloy thin film is a candidate material for the soft-magnetic underlayer of the new type of bit-patterned media.

Original languageEnglish
Pages (from-to)100-103
Number of pages4
JournalIntermetallics
Volume30
DOIs
Publication statusPublished - 2012 Nov

Keywords

  • A. Composites
  • B. Magnetic properties
  • C. Thin films
  • G. Magnetic applications

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Novel soft-magnetic underlayer of a bit-patterned media using CoFe-based amorphous alloy thin film'. Together they form a unique fingerprint.

  • Cite this