MAGNETIC TAPE DEVICE AND MAGNETIC REPRODUCING METHOD

• US 20180182425A1
• Filed: 12/20/2017
• Published: 06/28/2018
• Est. Priority Date: 12/27/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: KASADA, Norihito, OZAWA, Eiki, KANEKO, Tetsuya
• Granted Patent: US 10,403,320 B2
• Time in Patent Office: Days
• CPC Class Codes: G11B 5/00813 magnetic tapes
• 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 5/78 Tape carriers

Abstract

The magnetic tape device includes: a magnetic tape; and a reproducing head, in which 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 powder and a binding agent on the non-magnetic support, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.

Claims

1. A magnetic tape device comprising:

a magnetic tape; and

a reproducing head,

wherein 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 powder and a binding agent on the non-magnetic support, and

logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.

2. The magnetic tape device according to claim 1,

wherein the logarithmic decrement is 0.010 to 0.050.

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 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 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 powder and a binding agent on the non-magnetic support, and

logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.

8. The magnetic reproducing method according to claim 7,

wherein the logarithmic decrement is 0.010 to 0.050.

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.