Method and system for providing a transducer having dual, ABS recessed auxiliary poles on opposite sides of a main pole with non-magnetic spacer adjoining back portion of main pole and positioned between auxiliary poles

• US 8,405,930 B1
• Filed: 03/23/2011
• Issued: 03/26/2013
• Est. Priority Date: 03/23/2011
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: Western Digital Corporation
• Inventors: Bai, Zhigang, Liu, Feng, Wang, Yugang, Li, Zhanjie
• Primary Examiner(s): HEINZ, ALLEN J
• Application Number:
  US13/070,279
• Time in Patent Office: 734 Days
• Field of Search: 36012501-12575, 296/030.1, 296/030.7, 296/031.4
• US Class Current: 360/125.08
• CPC Class Codes: G11B 5/1278 specially adapted for magnetisations perpendicular to the surface of the record carrier
• CPC Class Codes: G11B 5/3116 Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks G11B5/3113, G11B5/245 take precedence
• CPC Class Codes: Y10T 29/49044 Plural magnetic deposition layers

Abstract

A method and system for providing a magnetic recording head is described. The magnetic recording head has an ABS configured to reside in proximity to a media during use. The magnetic recording head includes a main pole, first and second auxiliary poles, a backgap, a nonmagnetic spacer, and at least one coil. The main pole includes a pole tip occupying a portion of the ABS and a back edge distal from the ABS. Each auxiliary pole has a front recessed from the ABS and a back portion. A portion of the main pole distal from the ABS resides between the auxiliary poles. The auxiliary poles are magnetically coupled with the main pole. The backgap magnetically couples the back portions of the auxiliary poles. The nonmagnetic spacer adjoins the back edge of the main pole and is between the auxiliary poles. The coil(s) energize the main pole.

Claims

1. A magnetic recording head having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the magnetic recording head comprising:

a main pole including pole tip occupying a portion of the ABS and a back edge distal from the ABS;

a first auxiliary pole having a first front recessed from the ABS and a first back portion, the first auxiliary pole being magnetically coupled with the main pole;

a second auxiliary pole having a second front recessed from the ABS and a second back portion, a portion of the main pole distal from the ABS residing between the first auxiliary pole and the second auxiliary pole, the second auxiliary pole being magnetically coupled with the main pole;

a backgap magnetically coupling the first back portion of the first auxiliary pole with the second back portion of the second auxiliary pole;

a nonmagnetic spacer adjoining the back edge of the main pole and residing between the first auxiliary pole and the second auxiliary pole; and

at least one coil for energizing the main pole.

2. The magnetic recording head of claim 1 wherein the main pole is a perpendicular magnetic recording pole.

3. The magnetic recording head of claim 1 wherein the first front of the first auxiliary pole is a first distance from the ABS, wherein the second front of the second auxiliary pole is a second distance from the ABS, and wherein the first distance is different from the second distance.

4. The magnetic recording head of claim 1 wherein the first auxiliary pole has a first thickness, wherein the second auxiliary pole has a second thickness, and wherein the first thickness is different from the second thickness.

5. The magnetic recording head of claim 1 wherein the first auxiliary pole includes at least a first magnetic material, wherein the second auxiliary pole at least a second magnetic material, and wherein the at least the first magnetic material is different from the at least the second magnetic material.

6. The magnetic recording head of claim 5 wherein the at least the first magnetic material has a first saturation magnetization, wherein the at least the second magnetic material has a second saturation magnetization, and wherein the first saturation magnetization is different from the second saturation magnetization.

7. The magnetic recording head of claim 1 wherein the at least one coil includes a helical coil.

8. The magnetic recording head of claim 1 further comprising:

a return pole magnetically coupled with the first auxiliary pole and the second auxiliary pole through the backgap.

9. The magnetic recording head of claim 8 wherein the return pole includes a pedestal having a back surface, wherein the second auxiliary pole is closer to the return pole than the first auxiliary pole, and wherein the second auxiliary pole has a front edge at least 0.2 micron from the back surface of the pedestal.

10. The magnetic recording head of claim 9 wherein the front edge is at least 0.5 micron from the back surface of the pedestal.

11. The magnetic recording head of claim 1 wherein the nonmagnetic spacer resides between the back edge of the main pole and the backgap.

12. A perpendicular magnetic recording (PMR) head having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the magnetic recording head comprising:

a main pole including pole tip occupying a portion of the ABS and a back edge distal from the ABS;

a first auxiliary pole having a first front recessed a first distance from the ABS, a first back portion, a first thickness, a first saturation magnetization of at least one and not more than 2.3 T, and being magnetically coupled with the main pole;

a second auxiliary pole having a second front recessed a second distance from the ABS, a second back portion, a second thickness substantially equal to the first thickness, and a second saturation magnetization at least 1.8 and not more than 2 T, and being magnetically coupled with the main pole, a portion of the main pole distal from the ABS residing between the first auxiliary pole and the second auxiliary pole;

a backgap magnetically coupling the first back portion of the first auxiliary pole with the second back portion of the second auxiliary pole;

a nonmagnetic spacer adjoining the back edge of the main pole, residing between the first auxiliary pole and the second auxiliary pole;

a return pole having a pedestal and magnetically coupled with the first auxiliary pole and the second auxiliary pole through the backgap, the pedestal having a back surface, the second front of the second auxiliary pole being at least 0.5 micron from the back surface of the pedestal;

at least one helical coil for energizing the main pole.

13. The PMR head of claim 12 wherein the nonmagnetic spacer resides between the back edge of the main pole and the backgap.

14. A magnetic recording disk drive comprising:

a slider;

a magnetic recording head coupled with the slider and including a main pole, a first auxiliary pole, a second auxiliary pole, a backgap, a nonmagnetic spacer, and at least one coil, the main pole including pole tip occupying a portion of the ABS and a back edge distal from the ABS, the first auxiliary pole having a first front recessed from the ABS, a first back portion, and being magnetically coupled with the main pole, the second auxiliary pole having a second front recessed from the ABS, a second back portion, and being magnetically coupled with the main pole, a portion of the main pole distal from the ABS residing between the first auxiliary pole and the second auxiliary pole, the backgap magnetically coupling the first back portion of the first auxiliary pole with the second back portion of the second auxiliary pole, the nonmagnetic spacer adjoining the back edge of the main pole and residing between the first auxiliary pole and the second auxiliary pole, the at least one coil for energizing the main pole.

15. A method for providing a magnetic recording head having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the method comprising:

providing a main pole including pole tip occupying a portion of the ABS and a back edge distal from the ABS;

providing a first auxiliary pole having a first front recessed from the ABS and a first back portion, the first auxiliary pole being magnetically coupled with the main pole;

providing a second auxiliary pole having a second front recessed from the ABS and a second back portion, a portion of the main pole distal from the ABS residing between the first auxiliary pole and the second auxiliary pole, the second auxiliary pole being magnetically coupled with the main pole;

providing a backgap magnetically coupling the first back portion of the first auxiliary pole with the second back portion of the second auxiliary pole;

providing a nonmagnetic spacer adjoining the back edge of the main pole, residing between the first auxiliary pole and the second auxiliary pole; and

providing at least one coil for energizing the main pole.

16. The method of claim 15 wherein the main pole is a perpendicular magnetic recording pole.