Fabrication of L1{sub 1}-type (Co-Ni)-Pt ordered alloy films by sputter deposition
- Institute of Multidisciplinary Research for Advanced Material, Tohoku University, Sendai 980-8577 (Japan)
- Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577 (Japan)
L1{sub 1}-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, M{sub s}, maintaining a large K{sub u} of the order of 10{sup 7} erg/cm{sup 3}. L1{sub 1}-type ordered structures, with the <111> direction (easy axis of magnetization) perpendicular to the films, were successfully fabricated at a substrate temperature of 360 deg. 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 (Co{sub 1-X}Ni{sub X}){sub 50}Pt{sub 50}, independent of Ni content, X. L1{sub 1}-type Co-Ni-Pt perpendicular films having a large K{sub u} of (1-2.5)x10{sup 7} erg/cm{sup 3} and a relatively low M{sub s} of 400-700 emu/cm{sup 3} were successfully fabricated in the composition range of 10-35 at. % Co, 20-55 at. % Ni, and bal. Pt. K{sub u} 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 K{sub u} potential comparable to L1{sub 0}-type Fe{sub 50}Pt{sub 50} films, relatively low M{sub s}, the relatively low fabrication temperature, and good controllability of the grain orientation.
- OSTI ID:
- 21190150
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 105; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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