Optimization of granular double-layer perpendicular media

Optimized two types of granular, double-layer perpendicular recording media based on CoCrPtB and CoCrPtO alloy systems focusing mainly on signal-to-noise ratio (SNR) and thermal stability characteristics of the media. For the soft underlayer (SUL) portion of this study we compared NiFe, FeTaC, and F...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2002-07, Vol.38 (4), p.1627-1631
Main Authors: Bertero, G.A., Wachenschwanz, D., Malhotra, S., Velu, S., Bian, B., Stafford, D., Yan Wu, Yamashita, T., Wang, S.X.
Format: Article
Language:English
Subjects:
Amorphous magnetic materials
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Focusing
Iron compounds
Lamination
Magnetic films
Magnetic properties and materials
Magnetic recording materials
Magnetism
Magnetization
Media
Metals. Metallurgy
Nickel base alloys
Nickel compounds
Nucleation
Optical films
Optical microscopy
Optimization
Perpendicular magnetic recording
Physics
Soft magnetic materials
Studies of specific magnetic materials
Substrates
Thermal stability
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Summary:Optimized two types of granular, double-layer perpendicular recording media based on CoCrPtB and CoCrPtO alloy systems focusing mainly on signal-to-noise ratio (SNR) and thermal stability characteristics of the media. For the soft underlayer (SUL) portion of this study we compared NiFe, FeTaC, and FeAlSi films with and without lamination. Lamination of the SUL films resulted in marginal SNR improvement but was not effective in inhibiting the presence of magnetization domains. The CoCrPtB based media was found to have significantly lower noise than CoCrPtO, but its thermally stability is greatly compromised. On the other hand, the CoCrPtO media displayed negative nucleation fields and stable magnetization states even at DC-erased conditions.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2002.1017746