Fabrication of L1{sub 1} type Co-Pt ordered alloy films by sputter deposition
- Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577 (Japan)
L1{sub 1} type Co-Pt ordered alloy films with a large uniaxial magnetic anisotropy, K{sub u}, of the order of 10{sup 7} erg/cm{sup 3} were successfully fabricated at relatively low substrate temperatures of 270-390 deg. C using ultrahigh vacuum sputter film deposition. L1{sub 1} type ordered Co-Pt films, with the <111> direction (easy axis of magnetization) perpendicular to the film plane, were fabricated on MgO(111) single crystal substrates and glass disks. The ordered structure was formed in a wide Pt content region of 40-75 at. %, and K{sub u} showed a maximum at around 50 at. % Pt content. The values of the order parameter S and K{sub u} for L1{sub 1} type Co{sub 50}Pt{sub 50} films increased as the substrate temperature T{sub s}, increased. K{sub u} reached about 3.7x10{sup 7} erg/cm{sup 3} (S=0.54) at T{sub s}=360 deg. C for the single crystal films deposited on MgO(111) substrates, indicating a potential increase in K{sub u} by enhancing the ordering. The values of K{sub u} for polycrystalline films deposited on glass disks were smaller than those for the single crystal films on MgO(111) substrates, however, K{sub u} reached 1.9x10{sup 7} erg/cm{sup 3} at T{sub s}=360 deg. C. The experimental results demonstrate the potential of L1{sub 1} type Co{sub 50}Pt{sub 50} films for use in data storage applications, because of their very high K{sub u}, comparable to L1{sub 0} type Fe{sub 50}Pt{sub 50} films, the relatively low fabrication temperature, and good controllability of the grain orientation.
- OSTI ID:
- 21137320
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 103; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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