Patent ID: 8795765
Filing Date: 2014-08-05
Classification: G11B

Abstract:
1. A method for manufacturing a perpendicular magnetic recording medium to be used for recording information by a perpendicular magnetic recording system, comprising on a substrate and in the order from the bottom, at least a soft magnetic layer, an intermediate layer composed of consecutive N layers, where N is an integer of 3 or more, and a magnetic recording layer, characterized in that the method comprises the steps of: forming the intermediate layer of consecutive N layers by: first depositing a first layer containing ruthenium (Ru) as a main component at a first gas pressure; depositing on the first layer a second layer containing, as a main component, ruthenium (Ru) containing oxygen or Ru containing an oxide at a second gas pressure that is higher than the first gas pressure; depositing on the second layer a third layer containing, as a main component, ruthenium (Ru) containing oxygen or Ru containing an oxide, wherein the third layer has an oxygen content that is higher than that of the second layer; and when N is an integer more than 3, depositing on the third layer one or more succeeding layers each containing, as a main component, ruthenium (Ru) containing oxygen or Ru containing an oxide, such that the intermediate layer has an increasing oxygen content towards the magnetic recording layer.