Magnetic properties and microstructure of FePt-M-B(M{double bond, short}Zr, Nb, La) films

H. Okumura, S. Nishinakagawa, T. Bitoh, A. Makino, K. Sato, Y. Hirotsu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We investigated the compositional dependence of microstructure and the coercivity of FePt-M-B(M{double bond, short}Zr, Nb, La) sputter-deposited films. As-deposited ternary FePt-B films have an amorphous structure and low coercivity. After annealing at 923 K for 1.8 ks, ordered L10 FePt nanoparticles were observed. With the adding of the fourth element of M(Zr, Nb, La), the as-deposited films were also of the amorphous structure. After annealing at the same condition, the films show high coercivity of ∼520 kA/m and ordered L10 FePt phase are found. Compared with the ternary FePt-B films, the structure, coercivity and grain size vary with the additional element (M) and the compositions. The effects of additive elements on transformation to the L10-ordered phase have been studied.

Original languageEnglish
Pages (from-to)2527-2528
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Issue number2 SUPPL. PART 3
Publication statusPublished - 2007 Mar


  • Granular film
  • L1 ordering
  • Sputtering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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