Method to Improve Corrosion Performance of Exchange Coupled Granular Perpendicular Media
The invention relates to a granular perpendicular magnetic recording medium comprising a top magnetic layer on a granular layer wherein the magnetic layer comprises a continuous Co alloy film that results in the recording medium having less than 10% CoOx on the surface of the protective overcoat when the recording medium is exposed to 80% relative humidity at 80° C. for 4 days.
1 . A method of improving the corrosion performance of granular perpendicular recording media comprising depositing a top magnetic layer onto a granular layer using high sputter power and/or low sputter gas pressure.
2 . The method of claim 1 , wherein the sputter power is greater than about 0.8 kW.
3 . The method of claim 1 , wherein the sputter gas pressure is less than about 5 mTorr.
4 . The method of claim 1 , wherein the sputter power is greater than about 0.8 kW and the sputter gas pressure is less than about 5 mTorr.
5 . The method of claim 1 , wherein a thickness of the magnetic layer is from about 50 to about 80 Å.
6 . The method of claim 5 , wherein the thickness is about 65 Å.
7 . A method of manufacturing a granular perpendicular magnetic recording medium comprising obtaining a substrate, depositing a granular layer, and depositing a top magnetic layer onto the granular layer, wherein the magnetic recording layer is deposited using high sputter power and/or low sputter gas pressure.
8 . The method of claim 7 , wherein the sputter power is greater than about 1.2 kW.
9 . The method of claim 7 , wherein the sputter gas pressure is less than about 60 mTorr.
10 . The method of claim 7 , wherein the sputter power is greater than about 1.2 kW and the sputter gas pressure is less than about 60 mTorr.
11 . The method of claim 7 , wherein a thickness of the magnetic layer is from about 90 to about 130 Å.
12 . The method of claim 11 , wherein the thickness is about 100 Å.