Magnetic recording medium and cartridge
US-2022148618-A1 · May 12, 2022 · US
Magnetic recording medium and servo signal recording device
US11862212B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11862212-B2 |
| Application number | US-202017599843-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 27, 2020 |
| Priority date | Mar 29, 2019 |
| Publication date | Jan 2, 2024 |
| Grant date | Jan 2, 2024 |
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Abstract
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[Solving Means] A magnetic recording medium according to an embodiment of the present technology is a tape-shaped magnetic recording medium, including: a magnetic layer including a servo band, a servo signal being recorded on the servo band. An index expressed by Sq×Fact.(p−p)/F0(p−p) is 0.42 or more, Sq being a squareness ratio of the magnetic layer in a perpendicular direction, F0(p−p) being a peak-to-peak value of a first magnetic force gradient strength observed by a magnetic force microscope when a servo signal is saturation-recorded on the magnetic layer, Fact.(p−p) being a peak-to-peak value of a second magnetic force gradient strength for the servo signal recorded on the servo band observed by the magnetic force microscope.
First claim
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The invention claimed is: 1. A tape-shaped magnetic recording medium, comprising: a magnetic layer including a servo band, a servo signal being recorded on the servo band, wherein an index expressed by Sq×Fact.(p−p)/F0(p−p) is 0.42 or more, Sq being a squareness ratio of the magnetic layer in a perpendicular direction, F0(p−p) being a peak-to-peak value of a first magnetic force gradient strength observed by a magnetic force microscope when a servo signal is saturation-recorded on the magnetic layer, Fact.(p−p) being a peak-to-peak value of a second magnetic force gradient strength for the servo signal recorded on the servo band observed by the magnetic force microscope. 2. The magnetic recording medium according to claim 1 , wherein the index is 0.45 or more. 3. The magnetic recording medium according to claim 1 , wherein the squareness ratio (Sq) of the magnetic layer in the perpendicular direction is 0.5 or more. 4. The magnetic recording medium according to claim 3 , wherein the squareness ratio (Sq) of the magnetic layer in the perpendicular direction is 0.6 or more. 5. The magnetic recording medium according to claim 1 , wherein a ratio (Fact.(p−p)/F0(p−p)) of Fact.(p−p) to F0(p−p) is 0.6 or more. 6. The magnetic recording medium according to claim 5 , wherein the ratio (Fact.(p−p)/F0(p−p)) of Fact.(p−p) to F0(p−p) is 0.7 or more. 7. The magnetic recording medium according to claim 1 , wherein a residual magnetization (Mrt) of the magnetic layer is 0.39 or more. 8. The magnetic recording medium according to claim 7 , wherein the residual magnetization (Mrt) of the magnetic layer is 0.45 or more. 9. The magnetic recording medium according to claim 1 , wherein the servo signal is a servo signal recording pattern including a plurality of stripes inclined at a predetermined azimuth angle with respect to a tape width direction. 10. The magnetic recording medium according to claim 1 , wherein the magnetic layer contains a magnetic powder of hexagonal ferrite, ε-iron oxide, or cobalt ferrite. 11. A servo signal recording device that records a servo signal on a tape-shaped magnetic recording medium including a magnetic layer including a servo band, the device including a servo write head and an auxiliary magnetic pole, comprising: a servo write head that records a servo signal on the servo band; and an auxiliary magnetic pole that is disposed to face the servo write head with the magnetic layer interposed therebetween, and is formed of a soft magnetic material.
Assignees
Inventors
Classifications
- G11B5/5928Primary
Longitudinal tracks · CPC title
characterised by the composition of the magnetic material · CPC title
Tape carriers · CPC title
- G11B5/70605Primary
metals or alloys · CPC title
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- What does patent US11862212B2 cover?
- [Solving Means] A magnetic recording medium according to an embodiment of the present technology is a tape-shaped magnetic recording medium, including: a magnetic layer including a servo band, a servo signal being recorded on the servo band. An index expressed by Sq×Fact.(p−p)/F0(p−p) is 0.42 or more, Sq being a squareness ratio of the magnetic layer in a perpendicular direction, F0(p−p) being …
- Who is the assignee on this patent?
- Sony Group Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/5928. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 02 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).