MAGNETIC TAPE DEVICE AND MAGNETIC REPRODUCING METHOD

• US 20180182427A1
• Filed: 12/26/2017
• Published: 06/28/2018
• Est. Priority Date: 12/27/2016
• Status: Abandoned Application

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: KASADA, Norihito, OZAWA, Eiki, KANEKO, Tetsuya
• Application Number:
  US15/854,403
• Publication Number:
  US 20180182427A1
• Time in Patent Office: Days
• CPC Class Codes: G11B 5/00817 on longitudinal tracks only, e.g. for serpentine format recording
• CPC Class Codes: G11B 5/3909 Arrangements using a magnetic tunnel junction
• CPC Class Codes: G11B 5/70 on a base layer
• CPC Class Codes: G11B 5/70678 Ferrites
• CPC Class Codes: G11B 5/708 characterised by addition of non-magnetic particles to the layer
• CPC Class Codes: G11B 5/78 Tape carriers

Abstract

The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.

Claims

1. A magnetic tape device comprising:

a magnetic tape; and

a reproducing head,

wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,

the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element,

the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, and

a tilt cos θ

of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.

2. The magnetic tape device according to claim 1,

wherein the cos θ

is 0.87 to 0.95.

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 any one of 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 μ

m.

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 μ

m.

7. A magnetic reproducing method comprising:

reproducing information recorded on a magnetic tape by a reproducing head,

wherein a magnetic tape transportation speed during the reproducing is equal to or lower than 18 m/sec,

the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element,

the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, and

a tilt cos θ

of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.

8. The magnetic reproducing method according to claim 7,

wherein the cos θ

is 0.87 to 0.95.

9. The magnetic reproducing 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 magnetic reproducing method according to claim 9,

wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.

11. The magnetic reproducing 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 μ

m.

12. The magnetic reproducing 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 μ

m.