Patent ID: 6413608
Filing Date: 2002-07-02
Classification: C23C,G11B,Y10S,Y10T

Abstract:
A thin film magnetic disk comprising:a non-metallic substrate; a seed layer deposited onto said substrate; an underlayer deposited upon said seed layer, said underlayer including a chromium oxygen compound and having a first portion and a second portion wherein said underlayer has chromium and oxygen throughout the thickness thereof; said first portion being disposed upon said seed layer and having an oxygen concentration in the range of from approximately 2,000 ppm to approximately 20,000 ppm; said second portion being disposed upon said first portion, and having an oxygen concentration in the range of from approximately 500 ppm to approximately 1,500 ppm; wherein the total thickness of said underlayer is from approximately 250 Ã¥ to approximately 700 Ã¥; a magnetic layer being deposited upon said second portion of said underlayer.