Fabrication of L11 -type (Co-Ni)-Pt ordered alloy films by sputter deposition

H. Sato, T. Shimatsu, H. Kataoka, H. Aoi, S. Okamoto, O. Kitakami

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16 Citations (Scopus)

Abstract

L 11 -type (Co-Ni)-Pt ordered alloy perpendicular films were successfully fabricated on MgO(111) single crystal substrates using ultrahigh vacuum sputter film deposition; the addition of Ni to Co-Pt was effective to reduce saturation magnetization, Ms, maintaining a large Ku of the order of 107 erg/ cm3. L 11 -type ordered structures, with the 〈 111 〉 direction (easy axis of magnetization) perpendicular to the films, were successfully fabricated at a substrate temperature of 360 °C in a wide composition range with Co content less than 60 at. %. The order parameter, S, was almost a constant of about 0.5 in the stoichiometric composition of (Co1-X NiX) 50 Pt50, independent of Ni content, X. L 11 -type Co-Ni-Pt perpendicular films having a large Ku of (1-2.5) × 107 erg/ cm3 and a relatively low Ms of 400-700 emu/ cm3 were successfully fabricated in the composition range of 10-35 at. % Co, 20-55 at. % Ni, and bal. Pt. Ku should increase further with enhanced ordering. Experimental results demonstrated the potential of these Co-Ni-Pt ordered films for use in data storage applications due to very high Ku potential comparable to L 10 -type Fe50 Pt50 films, relatively low Ms, the relatively low fabrication temperature, and good controllability of the grain orientation.

Original languageEnglish
Article number07B726
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
Publication statusPublished - 2009 Apr 27

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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