Magnetic tape and method of manufacturing the same
US-9721605-B2 · Aug 1, 2017 · US
Magnetic tape device and head tracking servo method
US9984716B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-9984716-B1 |
| Application number | US-201715854507-A |
| Country | US |
| Kind code | B1 |
| Filing date | Dec 26, 2017 |
| Priority date | Dec 27, 2016 |
| Publication date | May 29, 2018 |
| Grant date | May 29, 2018 |
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- Title
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Abstract
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The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
First claim
Opening claim text (preview).
What is claimed is: 1. A magnetic tape device comprising: a magnetic tape; and a servo head, wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %. 2. The magnetic tape device according to claim 1 , wherein the C—H derived C concentration is 50 to 65 atom %. 3. The magnetic tape device according to claim 1 , wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm. 4. The magnetic tape device according to claim 3 , wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm. 5. The magnetic tape device according to claim 1 , wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, and a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm. 6. The magnetic tape device according to claim 5 , wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm. 7. A head tracking servo method comprising: reading a servo pattern of a magnetic layer of a magnetic tape by a servo head in a magnetic tape device, wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes the servo pattern, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %. 8. The head tracking servo method according to claim 7 , wherein the C—H derived C concentration is 50 to 65 atom %. 9. The head tracking servo method according to claim 7 , wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm. 10. The head tracking servo method according to claim 9 , wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm. 11. The head tracking servo method according to claim 7 , wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, and a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm. 12. The head tracking servo method according to claim 11 , wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm.
Assignees
Inventors
Classifications
Tape carriers · CPC title
on a base layer · CPC title
characterised by the lubricant · CPC title
Arrangements using a magnetic tunnel junction · CPC title
protecting the magnetic layer · CPC title
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Frequently asked questions
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- What does patent US9984716B1 cover?
- The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo…
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/84. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 29 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). 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).