Granular L1{sub 0} FePt-X (X=C, TiO{sub 2}, Ta{sub 2}O{sub 5}) (001) nanocomposite films with small grain size for high density magnetic recording

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

DOI:https://doi.org/10.1063/1.3057874· OSTI ID:21190146

Chen, J S; Chow, G M ^[1]; Lim, B C; Ding, Y F; Hu, J F ^[2]; Ju, G ^[3]

---

1. Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore)
2. Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117576 (Singapore)
3. Seagate Technology, Pittsburgh, Pennsylvania (United States)

FePt-X (X=C, TiO{sub 2}, Ta{sub 2}O{sub 5}) nanocomposite films were deposited on MgO/CrRu/glass substrates at 350 deg. C by magnetron cosputtering. The comparison investigations on the magnetic properties and microstructure of FePt-X films with various dopants were conducted. All FePt-X films showed (001) preferred orientation and oxide dopants promoted the formation of magnetically soft fcc FePt phase. With 15 vol % C doping, FePt-C film with columnar grains of 7.5 nm was obtained and the out-of-plane coercivity measured at room temperature was as high as 14.4 kOe. The increase in carbon volume fraction to 20% caused the formation of two-layer structure, whereas for the 20 vol % TiO{sub 2} and Ta{sub 2}O{sub 5} doping, the columnar structure of the FePt films remained and the corresponding grain sizes were 5 and 10 nm, respectively. Ta{sub 2}O{sub 5} doping showed better grain isolation than the others. The out-of-plane coercivities of FePt-TiO{sub 2} and FePt-Ta{sub 2}O{sub 5} films were 7.5 and 8.8 kOe, respectively.

• OSTI ID: 21190146
• 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
CARBON
COERCIVE FORCE
COMPOSITE MATERIALS
DOPED MATERIALS
FCC LATTICES
GLASS
GRAIN ORIENTATION
GRAIN SIZE
IRON ALLOYS
MAGNESIUM OXIDES
MAGNETIC PROPERTIES
NANOSTRUCTURES
PLATINUM ALLOYS
SPUTTERING
SURFACE COATING
TANTALUM OXIDES
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
TITANIUM OXIDES