Effect of Ru underlayer on magnetic properties of high B s-Fe70Co30 films

Yuji Uehara, Takayuki Kubomiya, Toyoo Miyajima, Shoji Ikeda, Yoshimasa Miura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We have investigated the effect of a Ru underlayer on the magnetic properties and film structures of Fe70Co30 films. A 0.7-nm-thick Ru underlayer contributes to the decrease in coercivity to 2-3 Oe in Fe-Co films. A 200-nm-thick Fe-Co film with a Ru underlayer exhibits a good μ-f response, that is, the real part of permeability μ́ remains constant up to 3 GHz. The reasons for achieving soft magnetic properties are presumably the fine and uniform grain structures, and the increasing crystal orientation of bcc(211) or the decreasing crystal orientation of bcc( 110). By applying a Ru/Fe-Co layer to the pole tip materials of write heads, further improvement in write performance can be expected.

Original languageEnglish
Pages (from-to)7002-7005
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number10
Publication statusPublished - 2004 Oct


  • FeCo binary alloy
  • Magnetic anisotropy
  • Magnetic flux density
  • Ru underlayer
  • Soft magnetic properties

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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