NDLI: The optimization of coercivity in granular recording material using rapid thermal processing

Content Provider	IEEE Xplore Digital Library
Author	Carey, R. Newman, D.M. Thomas, B.W.J. Bouvier, P.
Copyright Year	1965
Abstract	Granular cobalt films about 500 nm thick and ranging in composition from 0.25-0.85 fraction by volume of cobalt have been prepared by co-sputtering cobalt and silicon dioxide from a mosaic target. At a given sputtering power and pressure the volume fraction (q) of cobalt in the films is determined by the areal fraction of the SiO/sub 2/ base target covered by the cobalt mosaic. Transmission electron microscopy indicates that the samples are composed of particles of cobalt with diameters in the range 2.5 nm-6.5 nm dispersed in the SiO/sub 2/ matrix. Magnetic properties of samples with q in the range 0.25-0.85 are measured using a vibrating sample magnetometer. Samples with q below 0.52 are generally superparamagnetic in their as-deposited state. Subsequent rapid thermal processing (RTP) is shown to initiate ferromagnetic behaviour with a coercivity that increases with processing temperature. Optical constants of the films, measured by ellipsometry, are found to be in good agreement with Maxwell Garnett theory. Some films exhibit a saturation polar Kerr rotation that is significantly greater than that of pore cobalt films.
Sponsorship	IEEE Magnetics Society
Starting Page	3295
Ending Page	3297
Page Count	3
File Size	328081
File Format	PDF
ISSN	00189464
Volume Number	31
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-01
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 Cobalt Optical films Semiconductor films Silicon compounds Sputtering Transmission electron microscopy Magnetic properties Q measurement Vibration measurement
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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