Magnetic recording medium
AssigneeTDK Corporation
InventorShigeharu Watase
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Abstract
A magnetic recording medium comprising at least a lower non-magnetic layer containing at least a non-magnetic powders and a binder resin formed on a non-magnetic support and an upper magnetic layer formed on the lower non-magnetic layer, wherein the magnetic recording medium is used for a recording-reproducing system in which recorded signals are reproduced by an MR head, and a plastic deformation hardness Hv from the upper magnetic layer surface to an indentation depth of 0.1 μm is 100 to 200 mgf/μm2and a Young's modulus E in a thickness direction from the upper magnetic layer surface to the indentation depth of 0.1 μm is 2000 to 3000 mgf/μm2.
Claims7
A magnetic recording medium comprising at least a lower non-magnetic layer containing at least a non-magnetic powder and a binder resin formed on a non-magnetic support and an upper magnetic layer formed on the lower non-magnetic layer, wherein the magnetic recording medium is used for a recording-reproducing system in which recorded signals are reproduced by an MR head, and the upper magnetic layer contains at least two kinds of binder resins and a mean glass transition temperature Tg calculated from each Tg of the at least two kinds of binder resins is 40° C. to 80° C., and a plastic deformation hardness Hv from the upper magnetic layer surface to an indentation depth of 0.1 μm is 100 to 200 mgf/μm2 and a Young's modulus E in a thickness direction from the upper magnetic layer surface to the indentation depth of 0.1 μm is 2,000 to 3,000 mgf/μm2.
Dependencies are inferred from the claim text.