Patent ID: 6472047
Filing Date: 2002-10-29
Classification: G11B,Y10T

Abstract:
A magnetic recording medium comprising:a substrate; an inorganic compound underlayer including a first oxide having a crystalline grain structure and a second oxide having a non-crystalline structure formed over the substrate, wherein said second oxide is formed along the grain boundaries of the first oxide and when the grains in the inorganic compound layer are viewed in an in-plane direction, an average number of grains surrounding one grain is between 5.7 and 6.3; and further wherein, said first oxide includes an inorganic compound material selected from the group consisting of cobalt oxide, chromium oxide, iron oxide and nickel oxide, and said second oxide includes an inorganic compound material selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide, tantalum oxide and zinc oxide; and a magnetic layer formed over the underlayer.