Microstructure and coercivity of granular nanocomposite FePt-Ag multilayer films

The face-centered-tetragonal granular L1/sub 0/FePt nanoparticles with large in-plane coercivity (Hc/sub ///) of about 3923 Oe can be achieved by an Ag-capped layer of 5-nm thickness deposited onto the FePt magnetic layer, with thickness of 20 nm, after annealing at 400/spl deg/C for 30 min. The per...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2005-10, Vol.41 (10), p.3340-3342
Main Authors: Chen, S.C., Kuo, P.C., Sun, A.C., Chou, C.Y., Fang, Y.H., Kuo, S.Y.
Format: Article
Language:English
Subjects:
Ag-capped layer
Annealing
Coercive force
coercivity
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
FePt-Ag multilayer films
Grain boundaries
Magnetic films
Magnetic multilayers
Magnetism
magnetron sputtering
Materials science
Microstructure
Nonhomogeneous media
Other topics in materials science
Perpendicular magnetic recording
Physics
Sputtering
Temperature
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Summary:The face-centered-tetragonal granular L1/sub 0/FePt nanoparticles with large in-plane coercivity (Hc/sub ///) of about 3923 Oe can be achieved by an Ag-capped layer of 5-nm thickness deposited onto the FePt magnetic layer, with thickness of 20 nm, after annealing at 400/spl deg/C for 30 min. The perpendicular coercivity (Hc/sub /spl perp//) of the films is increased by increasing the annealing temperature (T/sub s/), and the Hc/sub /spl perp// value is about equal to the Hc/sub /// value when the annealing temperature is increased to 600/spl deg/C. TEM-energy disperse spectrum analysis reveals that the Ag mainly distributed at the grain boundary of FePt and results in the isolation of the FePt grains as well as the increase of the grain boundary energy, which will enhance coercivity and change the preferred orientation of the FePt film.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2005.854703