DocumentCode
1167861
Title
Signal-to-noise ratio and thermal stability issues in extending synthetic ferrimagnetic media technology over 100 Gb/in2
Author
Acharya, B. Ramamurthy ; Abarra, E. Noel ; Inomata, Akihiro ; Ajan, Antony ; Shinohara, Masayoshi
Author_Institution
Adv. Magnetic Recording Lab., Fujitsu Labs. Ltd., Atsugi, Japan
Volume
39
Issue
2
fYear
2003
fDate
3/1/2003 12:00:00 AM
Firstpage
645
Lastpage
650
Abstract
Signal-to-noise ratio (SNR) and thermal stability issues are addressed to evaluate synthetic ferrimagnetic media (SFM) for achieving areal densities >100 Gb/in2. Thermally stable SFM is obtained at Mrδ values as low as 0.15 memu/cm2, utilizing a higher magnetic anisotropy for the stabilization magnetic layer. The SNR relations for SFM are decided by the effective Mrδ and coercivity, similar to conventional media. The recording characteristics of a low Mrδ medium was compared with a higher Mrδ medium used for the 106-Gb/in2 demonstration. Lower medium noise and higher signal resolution of the lower Mrδ medium indicate an areal density extension to beyond ∼150 Gb/in2.
Keywords
coercive force; ferrimagnetic materials; magnetic anisotropy; magnetic recording noise; remanence; signal resolution; thermal stability; areal density; coercivity; magnetic anisotropy; remanent magnetization; signal resolution; signal-to-noise ratio; synthetic ferrimagnetic recording medium; thermal stability; Ferrimagnetic materials; Magnetic anisotropy; Magnetic field measurement; Magnetic heads; Magnetic noise; Magnetic recording; Perpendicular magnetic anisotropy; SQUID magnetometers; Signal to noise ratio; Thermal stability;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.2003.808986
Filename
1190078
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