Grain isolated L1{sub 0} FePt-Ta{sub 2}O{sub 5} nanocomposite films with large coercivity for perpendicular recording applications

Journal Article · Wed Apr 01 04:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3074133· OSTI ID:21190137

Lim, B C; Hu, J F; Lwin, P W; Ding, Y F; Cher, K M; Liu, B ^[1]; Chen, J S ^[2]

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1. Data Storage Institute, A-STAR - Agency for Science, Technology and Research, 5 Engineering Drive 1 (off Kent Ridge Crescent, NUS), Singapore 117608 (Singapore)
2. Department of Materials Science and Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore 117574 (Singapore)

L1{sub 0} FePt-Ta{sub 2}O{sub 5} films with (001) texture were synthesized by cosputtering FePt and Ta{sub 2}O{sub 5} targets and in situ heated at 350 deg. C. The (001) preferred orientation was preserved even when doped with 20 vol % Ta{sub 2}O{sub 5}. The out-of-plane coercivity, H{sub c}, increased from 6.7 kOe (for pure FePt film) to 8.8 kOe when doped with 20 vol % Ta{sub 2}O{sub 5}. Further increase in the dopant content to 25 and 30 vol % caused H{sub c} to decrease significantly to below 3 kOe. Well-isolated FePt grains of tall column structures were observed for the 12 nm thick FePt film when doped with 20 vol %. The loop slope parameter, {alpha}, of such FePt film approached 1.

• OSTI ID: 21190137
• 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

Related Subjects

36 MATERIALS SCIENCE
BINARY ALLOY SYSTEMS
COERCIVE FORCE
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DOPED MATERIALS
GRAIN ORIENTATION
IRON ALLOYS
NANOSTRUCTURES
PLATINUM ALLOYS
SPUTTERING
SURFACE COATING
TANTALUM OXIDES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
TEXTURE
THIN FILMS