NDLI: Atomic ordering and coercivity mechanism in FePt and CoPt polycrystalline thin films

Content Provider	IEEE Xplore Digital Library
Author	Jeong, S. Yu-Nu Hsu Laughlin, D.E. McHenry, M.E.
Copyright Year	1965
Abstract	40 nm thick CoPt and FePt films were prepared on oxidized Si substrates with 10 nm MgO underlayers. The maximum coercivity (H/sub c/) for CoPt films was found to be /spl sim/10 kOe after annealing at 700/spl deg/C for /spl sim/20-30 minutes (min). Structural analysis showed a significant amount of FCC phase as well as the ordered L1/sub 0/ phase in these films. FePt films showed an abrupt increase of ordered volume fraction and H/sub c/ in the initial stage of annealing and predominance of the tetragonal L1/sub 0/ phase after 10 min. at 700/spl deg/C. The maximum H/sub c/ reached /spl sim/16 kOe after annealing at 700/spl deg/C for more than 20 minutes. Dark field (DF) images of the annealed CoPt films showed individual grains which exhibited a possibility of several variants or disordered phase with dimensions similar to the exchange correlation length, b/sub cm/. The temperature dependence of H/sub c/ seems to indicate a weak pinning mechanism in the highly ordered FePt films. Magnetic force microscopy indicated a complex domain structure consisting of clusters with dimensions of several hundred nanometers.
Sponsorship	IEEE Magnetics Society
Starting Page	1299
Ending Page	1301
Page Count	3
File Size	161246
File Format	PDF
ISSN	00189464
Volume Number	37
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coercive force Transistors Magnetic films Magnetic force microscopy Annealing Magnetic devices Magnetic anisotropy Atomic force microscopy Magnetic forces Perpendicular magnetic anisotropy
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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