MANUFACTURING METHOD OF A PERPENDICULAR MAGNETIC RECORDING MEDIUM
In a manufacturing method of a perpendicular magnetic recording medium, a lower base layer is formed by depositing Ru or an Ru alloy on a soft magnetic underlayer in an inert gas atmosphere containing carbonized oxygen. An upper base layer is formed by depositing Ru or an Ru alloy on the lower base layer in an inert gas atmosphere. A magnetic layer serving as a recording layer is formed on the upper base layer.
1 . A manufacturing method of a perpendicular magnetic recording medium, comprising:
forming a lower base layer by depositing Ru or an Ru alloy on a soft magnetic underlayer in an inert gas atmosphere containing carbonized oxygen;
forming an upper base layer by depositing Ru or an Ru alloy on the lower base layer in an inert gas atmosphere; and
forming a magnetic layer on the upper base layer.
2 . The manufacturing method according to claim 1 , wherein the forming the lower base layer includes setting an amount of the carbonized oxygen added to the inert gas atmosphere to be equal to or greater than 2% and to be equal to or smaller than 10%.
3 . The manufacturing method according to claim 1 , wherein argon is use as an inert gas to create the inert gas atmosphere.
4 . The manufacturing method according to claim 3 , wherein when forming the lower base layer, carbon dioxide is used as the carbonized oxide.
5 . The manufacturing method according to claim 4 , wherein when forming the lower base layer, a pressure of the inert gas atmosphere containing argon and carbon dioxide is set to 0.7 Pa and a deposition rate is set to 3 to 5 nm/sec.
6 . The manufacturing method according to claim 4 , wherein when forming the upper base layer, a pressure of the inert gas atmosphere containing argon is set to 5.0 Pa and a deposition rate is set to 1 to 2 nm/sec.