Magnetic recording medium
AssigneeTDK Corporation
InventorHideki Sasaki
Life of this patent
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Abstract
A magnetic recording medium for use in reproduction with an MR head, which comprises: a non-magnetic substrate; a non-magnetic layer including a binder resin having dispersed therein a non-magnetic powder on the non-magnetic substrate; and a magnetic layer on the non-magnetic layer “has a thickness of at most 0.15 μm and”, wherein the magnetic layer is obtained by applying a magnetic coating material on the applied, dried and cured non-magnetic layer, the magnetic layer includes a metal magnetic powder with a mean major axis length of from 0.03 to 0.07 μm, and a saturation magnetization σs of from 100 to 125 Am2/kg “an X ray crystal particle size Dx of from 50-150 Å,”, and the center line mean roughness Ra of the magnetic layer surface is 5 nm or less.
Claims11
A magnetic recording medium for use in reproduction with an MR head, comprising:
- a non-magnetic substrate;
- a non-magnetic layer including a binder resin, in which a non-magnetic powder is dispersed, on the non-magnetic substrate;
- and a magnetic layer on the non-magnetic layer, wherein the magnetic layer has a thickness of at most 0.15 μm and is obtained by applying a magnetic coating material on the applied, dried and cured non-magnetic layer, the magnetic layer includes a metal magnetic powder with a mean major axis length of from 0.03 to 0.07 μm, and a saturation magnetization σs of from 100 to 125 Am2/kg, an X-ray crystal particle size Dx of from 50 to 150 Åand the center line mean roughness Ra of the magnetic layer surface is 5 nm or less.
A magnetic recording reproduction system for recording onto a magnetic record medium and reproducing with an MR head, the magnetic recording medium comprising:
- a non-magnetic substrate;
- a non-magnetic layer including a binder resin, in which a non-magnetic powder is dispersed, on at least one side of the non-magnetic substrate;
- and a magnetic layer having a thickness of at most 0.15 μm applied on the non-magnetic layer, wherein the magnetic layer includes a metal magnetic powder with a mean major axis length of from 0.03 to 0.07 μm, and a saturation magnetization σs of from 100 to 125 Am2/kg, an X-ray crystal particle size Dx of from 50 to 150 Åand the center line mean roughness Ra of the magnetic layer surface is 5 nm or less.
Dependencies are inferred from the claim text.