Reduction of magnetic grain size of perpendicular recording media with CoCrW seed layer

We report the use of CoCrW seed layer (SL) for making the fine grain granular structure and high crystalline orientation of CoCrPt-oxide magnetic recording layer. It is found that CoCrW SL should be of amorphouslike structure to make fine grain of CoCrPt-oxide magnetic layer. Moreover, the smooth surface of CoCrW SL provides high crystalline orientation of the CoCrPt-oxide magnetic layer.