NiP Seed Layer Effect on [Co/Pd]n/Pd/(NiP)/FeCoC Perpendicular Recording Media for Extremely High Areal Density

Eng Wei SOO  Weiwei JIANG  Lianjun WU  Jian-Ping WANG  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.10   pp.1740-1744
Publication Date: 2002/10/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Information Storage Technology)
Category: 
Keyword: 
double-layered perpendicular media,  [Co/Pd]n multilayer,  NiP seed layer,  grain isolation,  

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Summary: 
The effect of NiP as a seed layer for the [Co/Pd]n multilayer perpendicular recording media was studied. It was found that a thin layer of 2 nm NiP inserted between the FeCoC soft magnetic underlayer and the [Co/Pd]n recording layer improved the magnetic properties such as coercivity, squareness and nucleation field. These improvements may be due to the enhanced grain isolation promoted by the NiP seed layer, as well as the lower surface roughness of the NiP seed layer. Read/write test using Guzik spin stand with a ring-type head showed a D50 value 220 kFCI in the roll-off curve. The magnetic transitions recorded up to 390 kFCI for [Co/Pd]n media with the NiP seed layer can be observed clearly with MFM.