Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method
First Claim
1. A magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, whereina height of protrusions with a protrusion density of equal to or lower than 0.002 protrusion/μ
- m2 on a surface of the magnetic layer as measured by an atomic force microscope is equal to or lower than 40 nm;
a density of protrusions that are equal to or higher than 15 nm in height on the surface of the magnetic layer as measured by an atomic force microscope ranges from 0.01 to 0.18 protrusion/μ
m2; and
the protrusions that are equal to or higher than 15 nm in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs'"'"' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs'"'"' hardness exceeding 7.
1 Assignment
0 Petitions
Accused Products
Abstract
An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. A height of protrusions with a protrusion density of 0.002 protrusion/μm2 or lower on a surface of the magnetic layer as measured by AFM is 40 nm or lower; a density of protrusions that are 15 nm or higher in height on the surface of the magnetic layer as measured by AFM ranges from 0.01 to 0.18 protrusion/μm2; and the protrusions that are 15 nm or higher in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs'"'"' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs'"'"' hardness exceeding 7.
-
Citations
9 Claims
-
1. A magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein
a height of protrusions with a protrusion density of equal to or lower than 0.002 protrusion/μ - m2 on a surface of the magnetic layer as measured by an atomic force microscope is equal to or lower than 40 nm;
a density of protrusions that are equal to or higher than 15 nm in height on the surface of the magnetic layer as measured by an atomic force microscope ranges from 0.01 to 0.18 protrusion/μ
m2; andthe protrusions that are equal to or higher than 15 nm in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs'"'"' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs'"'"' hardness exceeding 7. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- m2 on a surface of the magnetic layer as measured by an atomic force microscope is equal to or lower than 40 nm;
-
8. A magnetic signal reproduction system comprising a magnetic recording medium and a reproduction head, wherein
the magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein a height of protrusions with a protrusion density of equal to or lower than 0.002 protrusion/μ - m2 on a surface of the magnetic layer as measured by an atomic force microscope is equal to or lower than 40 nm;
a density of protrusions that are equal to or higher than 15 nm in height on the surface of the magnetic layer as measured by an atomic force microscope ranges from 0.01 to 0.18 protrusion/μ
m2; andthe protrusions that are equal to or higher than 15 nm in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs'"'"' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs'"'"' hardness exceeding 7, and the reproduction head is a giant magneto resistive magnetic head.
- m2 on a surface of the magnetic layer as measured by an atomic force microscope is equal to or lower than 40 nm;
-
9. A magnetic signal reproduction method reproducing magnetic signals that have been recorded on a magnetic recording medium with a reproduction head, wherein
the magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein a height of protrusions with a protrusion density of equal to or lower than 0.002 protrusion/μ - m2 on a surface of the magnetic layer as measured by an atomic force microscope is equal to or lower than 40 nm;
a density of protrusions that are equal to or higher than 15 nm in height on the surface of the magnetic layer as measured by an atomic force microscope ranges from 0.01 to 0.18 protrusion/μ
m2; andthe protrusions that are equal to or higher than 15 nm in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs'"'"' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs'"'"' hardness exceeding 7, and the reproduction head is a giant magneto resistive magnetic head.
- m2 on a surface of the magnetic layer as measured by an atomic force microscope is equal to or lower than 40 nm;
Specification