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Thin-film recording media on flexible substrates for tape applications

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4 Author(s)
Hwan-Soo Lee ; Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA ; Lin Wang ; Bain, J.A. ; Laughlin, D.E.

Co-based alloys were investigated as candidates for sputtered thin-film magnetic tape media. Magnetic media on polymeric substrates having acceptable magnetic properties were obtained by applying NiAl/CrMn underlayers prior to CoCrPt deposition with a nonmagnetic CoCrTa intermediate layer. Typical sputtered tape media deposited on traditional polymeric substrates at room temperature revealed sideband modulation noise and large intergranular exchange coupling. A substantial improvement in surface roughness by utilizing smooth polymeric substrates eliminated this modulation noise and accounted for the signal dependent broad-band noise power. This suggests that transition noise is a dominant component of medium noise in sputtered tape media. Additionally, substrate bias is shown to be effective in producing grain decoupling that is necessary for good signal-to-noise ratio.

Published in:

Magnetics, IEEE Transactions on  (Volume:41 ,  Issue: 2 )