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Perpendicular magnetic recording media based on Co-Pd multilayer with granular seed layer

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6 Author(s)
Matsunuma, S. ; Dev. & Technol. Div., Hitachi Maxell Ltd., Ibaraki, Japan ; Yano, A. ; Fujita, E. ; Onuma, T.
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We have investigated Co-Pd multilayers deposited on a Pd-SiN granular seed layer and a FeTaC soft magnetic underlayer (SUL) for perpendicular magnetic recording. The Pd-SiN granular seed layer of 3 nm was found to be very effective for good magnetic properties with coercivity of 3.9 kOe, a negative nucleation field of -2.1 kOe, and a M-H loop slope parameter 4π (dM/dH)H=Hc of 1.3. The average column diameter of 13.7 nm with a dispersion of 21.7% was evaluated from the transmission electron microscopy image of well-separated columns with a clear boundary. This Co-Pd medium gave better playback performances by a merged ring giant magnetoresistive head compared to the medium with a Pd seed layer. The effect of Ar plasma etching on the SUL was also investigated to improve playback performance

Published in:

Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 4 )

Date of Publication:

Jul 2002

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