Addition of Ru to L10-FePt thin film to lower Curie temperature

Takuya Ono, Hitoshi Nakata, Tomohiro Moriya, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The addition of Ru to L10 (fct)-FePt thin films was investigated to lower the Curie temperature (Tc) of the films, which is beneficial for heat-assisted magnetic recording. The FePtRu films exhibited L10-ordering and perpendicular anisotropy for Ru contents up to at least 18 at. %, and Tc was reduced by ∼100°C/6 at. % Ru independent of the Fe/Pt ratio between 0.8 and 1.1. The Tc versus uniaxial magnetic anisotropy diagrams exhibited a linear trend similar to that of FePtCu films but with a larger slope. Systematic analysis clarified that the Ru additive caused a slight decrease of the anisotropic field but greatly decreased the saturation magnetization, which was related to the observed reduction in Tc.

Original languageEnglish
Article number123002
JournalApplied Physics Express
Issue number12
Publication statusPublished - 2016 Dec

ASJC Scopus subject areas

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


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