Low temperature deposited L1{sub 0} FePt-C (001) films with high coercivity and small grain size

Journal Article · Mon Sep 24 04:00:00 EDT 2007 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2789790· OSTI ID:21013658

Chen, J S; Lim, B C; Hu, J F; Liu, B; Chow, G M; Ju, G ^[1]

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1. Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608, Singapore and Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore)

FePt-C films with high coercivity (001) texture, and small grain size were deposited on MgO/CrRu/glass substrate by cosputtering FePt and carbon at 350 deg. C. The out-of-plane coercivity measured at room temperature increased from 9.6 to 15.1 kOe when C concentrations increased from 0% to 15%. Further increasing the C contents to 20% and 25% caused the decrease of coercivity to 13.6 and 11.8 kOe, respectively. With C doping, a two-layer structure of FePt-C films was formed and fcc-phase FePt particles were found. By optimizing the sputtering process, FePt-C (001) film with coercivity higher than 14.4 kOe and columnar FePt grains of 7.5 nm in diameter was obtained, which are suitable for ultrahigh density perpendicular recording.

• OSTI ID: 21013658
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 91; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINARY ALLOY SYSTEMS
CARBON
CHROMIUM COMPOUNDS
COERCIVE FORCE
DEPOSITION
FCC LATTICES
GLASS
GRAIN SIZE
IRON ALLOYS
LAYERS
MAGNESIUM OXIDES
OPTIMIZATION
PARTICLES
PLATINUM ALLOYS
SPUTTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEXTURE
THIN FILMS