MAGNETIC HEAD

• US 20100053810A1
• Filed: 09/04/2008
• Published: 03/04/2010
• Est. Priority Date: 09/04/2008
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biskeborn, Robert Glenn, Lo, Calvin Shyhjong
• Granted Patent: US 8,027,124 B2
• Time in Patent Office: Days
• US Class Current: 360/110
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: B82Y 25/00 Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: G11B 2005/3996 large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time
• CPC Class Codes: G11B 5/3909 Arrangements using a magnetic tunnel junction
• CPC Class Codes: G11B 5/3967 Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read G11B5/3906 takes precedence
• CPC Class Codes: G11B 5/584 for track following on tapes

Abstract

A system in one embodiment includes first and second modules, each module having a substrate, a closure, and a gap situated therebetween, the gap comprising transducers selected from readers and writers; wherein the closures face each other, wherein the closure and the substrate of each module form a flat tape bearing surface, wherein a module spacing is defined as a distance from a point proximate to the transducers in the gap of the first module to a point proximate to the transducers in the gap of the second module, wherein the module spacing is less than 1.3 mm and greater than 0 mm.

Claims

1. A system, comprising:

first and second modules, each module having a substrate, a closure, and a gap situated therebetween, the gap comprising transducers selected from readers and writers;

wherein the closures face each other,

wherein the closure and the substrate of each module form a flat tape bearing surface,

wherein a module spacing is defined as a distance from a point proximate to the transducers in the gap of the first module to a point proximate to the transducers in the gap of the second module,

wherein the module spacing is less than 1.3 mm and greater than 0 mm.

2. A system as recited in claim 1, wherein the module spacing is greater than about 0.5 mm.

3. A system as recited in claim 1, wherein the module spacing is between 0.5 mm and 1.3 mm.

4. A system as recited in claim 1, wherein the module spacing is not greater than about ¼

of a write width divided by a tangent of a maximum tape skew angle defined as an angle between a line crossing through counterpoints of the writer on the first module and the reader on the second module and a line parallel to an edge of a track written on a tape at maximum skew.

5. A system as recited in claim 1, wherein an internal wrap angle of each module is defined between a plane extending along the tape bearing surface thereof and the tape extending between the modules, wherein the internal wrap angle is about 0.8 degrees or less.

6. A system as recited in claim 5, wherein the internal wrap angle of each module is between about 0.3 degree and about 1.0 degree.

7. A system as recited in claim 1, wherein a length of each closure as measured parallel to a direction of tape travel thereacross is greater than a length of a tent of a tape passing thereover measured in the same direction.

8. A system as recited in claim 1, wherein a length of each closure as measured parallel to a direction of tape travel thereacross is between about 200 and about 300 microns.

9. A system as recited in claim 1, wherein at least one of the modules includes readers comprising AMR sensors.

10. A system as recited in claim 1, wherein at least one of the modules includes readers comprising GMR sensors.

11. A system as recited in claim 1, wherein at least one of the modules includes readers comprising TMR sensors.

12. A system as recited in claim 1, further comprising a third module.

13. A system as recited in claim 1, further comprising:

a drive mechanism for passing a magnetic recording tape over the modules; and

a controller in communication with the modules.

14. A system, comprising:

a first module having a substrate, a closure, and a gap situated therebetween, the gap comprising at least writers;

a second module having a substrate, a closure, and a gap situated therebetween, the gap comprising at least readers aligned with the writers of the first module in a direction of tape travel thereacross for reading data tracks written by the writers;

wherein the closures face each other,

wherein the closure and the substrate of each module form a flat tape bearing surface,

wherein a module spacing is defined as a distance from a point proximate to the transducers in the gap of the first module to a point proximate to the transducers in the gap of the second module,

wherein the module spacing is less than 1.3 mm and greater than 0.5 mm,

wherein an internal wrap angle of each module is defined between a plane extending along the tape bearing surface thereof and the tape extending between the modules, wherein the internal wrap angle is between about 0.3 degree and about 1.0 degree,

wherein a length of each closure as measured parallel to a direction of tape travel thereacross is greater than a length of a tent of a tape passing thereover measured in the same direction.

15. A system as recited in claim 14, wherein the module spacing is not greater than about ¼

of a write width divided by a tangent of a maximum tape skew angle defined as an angle between a line crossing through counterpoints of the writer on the first module and the reader on the second module and a line parallel to an edge of a track written on a tape at maximum skew.

16. A system as recited in claim 14, wherein the length of each closure is between about 200 and about 300 microns.

17. A system as recited in claim 14, wherein at least one of the modules includes readers comprising AMR sensors.

18. A system as recited in claim 14, wherein at least one of the modules includes readers comprising GMR sensors.

19. A system as recited in claim 14, wherein at least one of the modules includes readers comprising TMR sensors.

20. A system as recited in claim 14, further comprising:

a drive mechanism for passing a magnetic recording tape over the modules; and

a controller in communication with the modules.