Magnetic recording medium
First Claim
1. A magnetic recording medium comprising a non-magnetic substrate;
- a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and
a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder,wherein the magnetic powder is either a platy hexagonal ferrite magnetic powder or a spherical iron nitride magnetic powder,the magnetic layer has a thickness of 10 to 150 nm,the magnetic layer has a surface roughness of 1 nm or more and less than 2 nm,the magnetic powder has an average particle size between 10 nm and 25 nm inclusive,a lubricant layer is formed on a surface of the magnetic layer, andwhen spacing of the surface of the magnetic layer before and after washing the magnetic recording medium with n-hexane is measured with a TSA (Tape Spacing Analyzer) while pressurizing the surface of the magnetic recording medium under a pressing pressure of 0.5 atm, the value of the spacing before washing is 1 to 5 nm smaller than the value of 5 to 10 nm of the spacing after washing.
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Accused Products
Abstract
A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 nm and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.
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Citations
13 Claims
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1. A magnetic recording medium comprising a non-magnetic substrate;
- a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and
a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder,wherein the magnetic powder is either a platy hexagonal ferrite magnetic powder or a spherical iron nitride magnetic powder, the magnetic layer has a thickness of 10 to 150 nm, the magnetic layer has a surface roughness of 1 nm or more and less than 2 nm, the magnetic powder has an average particle size between 10 nm and 25 nm inclusive, a lubricant layer is formed on a surface of the magnetic layer, and when spacing of the surface of the magnetic layer before and after washing the magnetic recording medium with n-hexane is measured with a TSA (Tape Spacing Analyzer) while pressurizing the surface of the magnetic recording medium under a pressing pressure of 0.5 atm, the value of the spacing before washing is 1 to 5 nm smaller than the value of 5 to 10 nm of the spacing after washing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and
Specification