Microstructure and magnetic properties of FePt-MOx granular films

Taisuke Shiroyama*, Taichi Abe, Yukiko Takahashi, Kazuhiro Hono

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


We have studied the microstructures and magnetic properties of FePt-segregant granular films to achieve an ideal media structure on glass substrates for thermally assisted magnetic recording. Although FePt-C granular films show an excellent in-plane structure, it does not have a good surface roughness. Meanwhile, FePt-SiO2 granular films have a smooth surface and an interconnected in-plane microstructure. Therefore, to obtain both a surface with a small roughness and well-isolated small columnar grains, we have selected four metal oxides, MOx (M=Nb, W, Zr and Al) as segregants, which are expected to have a driving force for the phase separation between FePt-C and FePt-SiO2 based on thermodynamic evaluation. In this paper, we introduce the ground for selecting these materials as segregants and then show the microstructure and magnetic properties of FePt-MOx granular films.

Original languageEnglish
Article number6559101
Pages (from-to)3616-3619
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number7
Publication statusPublished - 2013
Externally publishedYes


  • FePt
  • granular film
  • thermally assisted magnetic recording

ASJC Scopus subject areas

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


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