Patent ID: 7429427

Claim:
A granular magnetic recording medium comprising: (a) a non-magnetic substrate; and (b) at least one granular magnetic recording layer overlying said substrate, said at least one granular magnetic recording layer comprising: (i) at least one ferromagnetic material including magnetic grains with grain boundaries; and (ii) a non-magnetic material for improving segregation of said magnetic grains, said non-magnetic material comprising a mixture of metal oxides, wherein said mixture is a binary mixture comprising first and second metal oxides selected from the group consisting of: TiO 2 , Al 2 O 3 , Nb 2 O 5 , SiO 2 , MoO 3 , Cr 2 O 3 , Ta 2 O 5 , ZrO 2 , V 2 O 5 , WO 3 , and Y 2 O 3 , the mole ratio of the first metal oxide and the second metal oxide is about 0.50:0.50, and a density of said binary mixture is greater than a density of either of the first metal oxide and the second metal oxide.