MAGNETIC RECORDING HEAD HAVING PROTECTED READER SENSORS AND NEAR ZERO RECESSED WRITE POLES

• US 20140063646A1
• Filed: 08/31/2012
• Published: 03/06/2014
• Est. Priority Date: 08/31/2012
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biskeborn, Robert G., Liang, Jason, Lo, Calvin S., Ting, Andrew C.
• Granted Patent: US 9,001,463 B2
• Time in Patent Office: Days
• US Class Current: 360/75
• CPC Class Codes: G11B 5/0083 for parallel information processing, e.g. PCM recording
• CPC Class Codes: G11B 5/11 Shielding of head against electric or magnetic fields
• CPC Class Codes: G11B 5/1871 Shaping or contouring of the transducing or guiding surface
• CPC Class Codes: G11B 5/255 comprising means for protection against wear in thin film structures G11B5/3106
• CPC Class Codes: G11B 5/265 Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track G11B5/33 takes precedence in thin film structures G11B5/31
• CPC Class Codes: G11B 5/29 Structure or manufacture of unitary devices formed of plural heads for more than one track G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31
• CPC Class Codes: G11B 5/3109 Details G11B5/3103 takes precedence
• CPC Class Codes: G11B 5/3912 Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields G11B5/3916 takes precedence
• 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 5/4893 relative to moving tape
• CPC Class Codes: G11B 5/60 Fluid-dynamic spacing of heads from record-carriers

Abstract

A magnetic head according to one embodiment includes a module, the module having both read and write transducers positioned towards a media facing side of the module, wherein the read and write transducers are selected from a group consisting of piggyback read-write transducers, merged read-write transducers, interleaved read and write transducers, and an array of write transducers flanked by servo read transducers; wherein the write transducers include write poles having media facing sides with negative, zero or near-zero recession from a plane extending along the media facing side of a substrate of the module; wherein the read transducers each have at least one shield, wherein a media facing side of the at least one shield is more recessed from the plane than the write poles.

Claims

1. A magnetic head, comprising:

a module, the module having both read and write transducers positioned towards a media facing side of the module, wherein the read and write transducers are selected from a group consisting of piggyback read-write transducers, merged read-write transducers, interleaved read and write transducers, and an array of write transducers flanked by servo read transducers;

wherein the write transducers include write poles having media facing sides with negative, zero or near-zero recession from a plane extending along the media facing side of a substrate of the module;

wherein the read transducers each have at least one shield, wherein a media facing side of the at least one shield is more recessed from the plane than the write poles.

2. A head as recited in claim 1, further comprising a coating on the media facing side of the module adjacent the read transducers.

3. A head as recited in claim 1, wherein the media facing side of the at least one shield of each of the read transducers is recessed at least 5 nm more than the media facing sides of the write poles.

4. A head as recited in claim 1, wherein the media facing sides of the write poles are recessed from 0 to 7 nm from the plane.

5. A head as recited in claim 1, wherein the media facing sides of the write poles protrude above the plane.

6. A head as recited in claim 1, wherein the write poles of the write transducers and the at least one shield of each of the read transducers each comprise nickel and iron, wherein the write poles each have a higher iron content than the at least one shield of each of the read transducers.

7. A head as recited in claim 1, wherein the read and write transducers are merged read-write transducers.

8. A head as recited in claim 1, wherein the read and write transducers are piggyback read-write transducers.

9. A head as recited in claim 1, wherein the read and write transducers are present in an array of transducers extending along the media facing side of the module.

10. A head as recited in claim 1, wherein the magnetic head includes a second module having a configuration similar or identical to the module, the magnetic head being configured to operate with tape media.

11. A head as recited in claim 1, wherein the magnetic head includes a slider.

12. A head as recited in claim 1, wherein the module further includes a closure defining a portion of the media facing side of the module, wherein the closure and the substrate sandwich the read and write transducers therebetween.

13. A data storage system, comprising:

a magnetic head as recited in claim 1;

a drive mechanism for passing a magnetic medium over the magnetic head; and

a controller electrically coupled to the magnetic head.

14. A module, comprising:

an array of read and write transducers extending along a media facing side, wherein the read and write transducers are selected from a group consisting of piggyback read-write transducers, merged read-write transducers, interleaved read and write transducers, and an array of write transducers flanked by servo read transducers;

wherein the write transducers include write poles having media facing sides;

wherein the read transducers each have at least one shield, wherein a media facing side of the at least one shield is recessed from a plane extending across the media facing side of the write poles by at least 5 nm.

15. A module as recited in claim 14, wherein the media facing side of the at least one shield of each of the read transducers is recessed more than the media facing sides of the write poles.

16. A module as recited in claim 14, wherein the media facing sides of the write poles are recessed from 0 to 7 nm from a plane extending along a media facing side of a substrate of the module.

17. A module as recited in claim 14, wherein the media facing sides of the write poles protrude above a plane extending along a media facing side of a substrate of the module.

18. A data storage system, comprising:

a magnetic head having the module as recited in claim 14;

a drive mechanism for passing a magnetic medium over the magnetic head; and

a controller electrically coupled to the magnetic head.

19. A magnetic head, comprising:

a pair of read and write transducers selected from a group consisting of piggyback read-write transducers, and merged read-write transducers;

wherein the write transducers include write poles having media facing sides with negative, zero or near-zero recession from a plane extending along the media facing side of the substrate;

wherein the read transducers each have at least one shield, wherein a media facing side of the at least one shield is more recessed from the plane than the write poles.

20. A data storage system, comprising:

a magnetic head as recited in claim 19;

a drive mechanism for passing a magnetic medium over the magnetic head; and

a controller electrically coupled to the magnetic head.