Double-layered perpendicular magnetic recording

Asahi T (2004) Novel soft magnetic underlayer for double-layered perpendicular magnetic recording media Electroless-deposited films of CoNiFe-based alloy. IEEE Trans Magn 40 2356-2358... 

Osaka T (2005) Electroless-deposited soft magnetic underlayer on silicon disk substrate for double-layered perpendicular magnetic recording media. J Magn Magn Mater 287 292-297... 

In a double-layered perpendicular magnetic medium, an intermediate layer between a recording layer and an SUL plays an important role as a seed to control the crystal growth of the recording layer and to reduce the magnetic domain size of the recording layer. Moreover, the intermediate layer should be as thin as possible to minimize the... 

For the media preparation, 25-nm-thick CoZrNb soft magnetic film was sputtered onto Ni-P SUL and then a thick CoPtCr-SiC>2 granular recording layer. For comparison, a media with 200-nm-thick sputtered CoZrNb SUL was used. The results showed that an electroless-deposited ferromagnetic Ni-P layer (low phosphorus content), which is suitable for mass production as a SUL for a double-layered perpendicular recording media, exhibits almost the same magnetic properties and recording performances as a 200-nm-thick sputtered SUL. In addition, the spike noise which is commonly observed from SUL was not found for the media with Ni-P SUL. 

Sugiyama A (2005) Electroless deposition of soft magnetic underlayer for a double-layered perpendicular recording media. lEICE Tech Rep MR2004-48 15-20... 

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