New soft magnetic material of α′-Fe-C with high Bs

Migaku Takahashi*, Yukiko Takahashi, Kazuyuki Sunaga, Hiroki Shoji

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Epitaxial Fe-C films consisting of an α′-Fe-C single phase with a C content up to 12 at% can be synthesized on MgO single crystal substrates by sputtering. The saturation magnetization for the α′-Fe-C films maintains a constant value of about 210 emu/g (≈ 2.1 T) up to 8 at% C. The easy axis of magnetization of α′-Fe-C films lies in the (0 0 1) plane. The uniaxial magnetocrystalline anisotropy constant for α′-Fe-C is -0.5 × 106 erg/cm3 independent of the C content. The coercive force for the α′-Fe-C films with C content more than 4 at% is about 2 Oe. The α′-Fe-C films with 4-8 at% C are promising candidates for use as writing head material.

Original languageEnglish
Pages (from-to)479-483
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Issue number1-3
Publication statusPublished - 2002 Feb
Externally publishedYes


  • Coercive force
  • Magnetocrystalline anisotropy
  • Saturation magnetization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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