Comparison of Playback Performance of Facing Targets Sputtered Perpendicular and Longitudinal Tape Media

Playback performances of sputtered perpendicular recording tape media were investigated in comparison with longitudinal media. Perpendicular (Media P, out-of-plane coercivity of 318.3 kA/m) and longitudinal (Media L, inplane coercivity of 279.3 kA/m) recording tape media were deposited by facing tar...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-10, Vol.45 (10), p.3598-3600
Main Authors: Matsunuma, S., Inoue, T., Doi, T., Matsuu, T., Hashimoto, A., Hirata, K.-I., Nakagawa, S.
Format: Article
Language:English
Subjects:
Applied sciences
Chromium
Coercive force
Coercivity
Cross-disciplinary physics: materials science
rheology
Deposition
Exact sciences and technology
Facing targets sputtering
Magnetic recording
Magnetic tape
magnetic tape recording
Magnetism
Materials science
Media
Metals. Metallurgy
Noise levels
Other topics in materials science
Perpendicular magnetic recording
Physics
playback performance
Playbacks
Production techniques
Recording
Saturation magnetization
Signal to noise ratio
Soft magnetic materials
sputtered tape media
Sputtering
Surface treatment
Temperature
Testing
Waveforms
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Summary:Playback performances of sputtered perpendicular recording tape media were investigated in comparison with longitudinal media. Perpendicular (Media P, out-of-plane coercivity of 318.3 kA/m) and longitudinal (Media L, inplane coercivity of 279.3 kA/m) recording tape media were deposited by facing targets sputtering from the same target of Co 74 Pt 16 Cr 10 -SiO 2 for the recording layer at room temperature. For Media P, a soft magnetic FeCoB(50 nm) layer and a Ru(5 nm) seed layer were formed between the recording layer and an Aramid substrate. On the playback test by a drum tester with a ring writer/GMR reader, the waveform of all-ones signal at 5 kfci indicates that Media P has a dipulse response and the shorter PW50 value than Media L. Measured values of D50 were 233 kfci for Media P and 216 kfci for Media L, respectively. Saturation curves show that Media P has good writability. The signal-to-noise ratio (SNR) value of Media P is higher by 2.4 dB at 337 kfci than Media L. These high-resolution and high SNR properties indicate that sputtered perpendicular tape media are suitable for extremely high-density recording.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2023075