Abstract
We have developed a nonmagnetic (CoCr30)Zrx [x=7, 10, 14 at. %] seed layer for CoCrPt glass media and have compared its structural and noise properties to those of the media with a Ta/Zr dual seed layer, which have lower media noise than the media with a Cr seed layer. The media with a (CoCr30)Zr10 seed layer had lower media noise than that with the Ta/Zr dual seed layer, which is attributed to reduced grain size in the magnetic layer. However, the media noise increased drastically owing to a 78% increase of the grain size in the magnetic layer when the Zr content in the seed layer increased from 10 to 14 at. %. The transmission electron microscope analysis indicates that the (CoCr30)Zr10 seed layer has a nanocrystalline structure, while (CoCr30)Zr14 was almost amorphous. This would be the main reason of the drastic change in the grain size of the magnetic layer. The microstructure of the CoCrZr seed layer is very sensitive to the Zr content and strongly affects the microstructure of the magnetic layer and thereby media noise.
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