MAMR HEAD ADAPTED FOR HIGH SPEED SWITCHING

• US 20140177092A1
• Filed: 12/20/2012
• Published: 06/26/2014
• Est. Priority Date: 12/20/2012
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Inventors: Katada, Hiroyuki, Shiimoto, Masato
• Granted Patent: US 9,047,888 B2
• Time in Patent Office: Days
• US Class Current: 360/75
• CPC Class Codes: G11B 2005/0024 Microwave assisted recording
• CPC Class Codes: G11B 5/314 where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers G11B5/3196 takes precedence

Abstract

A microwave-assisted magnetic recording (MAMR) head according to one embodiment includes a main magnetic pole adapted to generate a writing magnetic field when current is applied to a write coil; a trailing shield positioned, at an air bearing surface (ABS), in a trailing direction from the main magnetic pole; and a field generation layer (FGL) positioned, at the ABS, between the main magnetic pole and the trailing shield, wherein either a portion of the main magnetic pole closer to the FGL or a portion of the trailing shield closer to the FGL is adapted to act as a spin polarization layer.

Claims

1. A microwave-assisted magnetic recording (MAMR) head, comprising:

a main magnetic pole adapted to generate a writing magnetic field when current is applied to a write coil;

a trailing shield positioned, at an air bearing surface (ABS), in a trailing direction from the main magnetic pole; and

a field generation layer (FGL) positioned, at the ABS, between the main magnetic pole and the trailing shield,

wherein either a portion of the main magnetic pole closer to the FGL or a portion of the trailing shield closer to the FGL is adapted to act as a spin polarization layer.

2. The MAMR head as recited in claim 1, further comprising:

an interlayer positioned, at the ABS, between the main magnetic pole and the FGL, wherein the interlayer comprises a non-magnetic material; and

a cap layer positioned, at the ABS, between the FGL and the trailing shield, wherein the cap layer comprises a non-magnetic material.

3. The MAMR head as recited in claim 2, wherein the portion of the main magnetic pole is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

4. The MAMR head as recited in claim 1, further comprising:

a spacer layer positioned, at the ABS, between the main magnetic pole and the FGL, wherein the spacer layer comprises a non-magnetic material; and

an interlayer positioned, at the ABS, between the FGL and the trailing shield, wherein the interlayer comprises a non-magnetic material.

5. The MAMR head as recited in claim 4, wherein the portion of the trailing shield is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

6. The MAMR head as recited in claim 1, further comprising:

an interlayer positioned, at the ABS, between the main magnetic pole and the FGL, wherein the interlayer comprises a non-magnetic material; and

a magnetic rotation guide layer positioned, at the ABS, between the FGL and the trailing shield.

7. The MAMR head as recited in claim 6, wherein the portion of the main magnetic is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

8. The MAMR head as recited in claim 1, further comprising:

a magnetic rotation guide layer positioned, at the ABS, between the main magnetic pole and the FGL; and

an interlayer positioned, at the ABS, between the FGL and the trailing shield, wherein the interlayer comprises a non-magnetic material.

9. The MAMR head as recited in claim 8, wherein the portion of the trailing shield is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

10. The MAMR head as recited in claim 1, wherein a surface of the main magnetic pole on a trailing shield-facing side thereof and a surface of the trailing shield on a main magnetic pole-facing side thereof are angled with respect to a direction normal to the ABS, and wherein the FGL is angled according to the angled surface of the main magnetic pole and the angled surface of the trailing shield.

11. The MAMR head as recited in claim 1, wherein a distance in a direction parallel to the ABS between the trailing shield and the main magnetic pole at the ABS is less than a distance in the direction parallel to the ABS between the trailing shield and the main magnetic pole at a point beyond a rear edge of the FGL in an element height direction thereof.

12. A magnetic data storage system, comprising:

at least one MAMR head as recited in claim 1;

a magnetic medium;

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

a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.

13. A method for forming a microwave-assisted magnetic recording (MAMR) head, the method comprising:

forming a main magnetic pole above a substrate, the main magnetic pole being adapted to generate a writing magnetic field when current is applied to a write coil;

forming a field generation layer (FGL) above the main magnetic pole, the FGL being adapted to generate a high-frequency magnetic field when current is applied thereto; and

forming a trailing shield above the FGL,

wherein either a portion of the main magnetic pole closer to the FGL or a portion of the trailing shield closer to the FGL is defined to act as a spin polarization layer.

14. The method as recited in claim 13, further comprising:

forming an interlayer between the main magnetic pole and the FGL at an air bearing surface (ABS), wherein the interlayer comprises a non-magnetic material; and

forming a cap layer between the FGL and the trailing shield at the ABS, wherein the cap layer comprises a non-magnetic material.

15. The method as recited in claim 14, wherein the portion of the main magnetic pole is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

16. The method as recited in claim 13, further comprising:

forming a spacer layer between the main magnetic pole and the FGL at an air bearing surface (ABS), wherein the spacer layer comprises a non-magnetic material; and

forming an interlayer between the FGL and the trailing shield at the ABS, wherein the interlayer comprises a non-magnetic material.

17. The method as recited in claim 16, wherein the portion of the trailing shield is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

18. The method as recited in claim 13, further comprising:

forming an interlayer between the main magnetic pole and the FGL at an air bearing surface (ABS), wherein the interlayer comprises a non-magnetic material; and

forming a magnetic rotation guide layer between the FGL and the trailing shield at the ABS.

19. The method as recited in claim 18, wherein the portion of the main magnetic is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

20. The method as recited in claim 13, further comprising:

forming a magnetic rotation guide layer between the main magnetic pole and the FGL at an air bearing surface (ABS); and

forming an interlayer between the FGL and the trailing shield at the ABS, wherein the interlayer comprises a non-magnetic material.

21. The method as recited in claim 20, wherein the portion of the trailing shield is adapted to act as the spin polarization layer, is in contact with the interlayer, and comprises a highly-polarized material.

22. The method as recited in claim 13, wherein a surface of the main magnetic pole on a trailing shield-facing side thereof and a surface of the trailing shield on a main magnetic pole-facing side thereof are formed at an angle with respect to a direction normal to the ABS, and wherein the FGL is formed at the angle according to the angled surface of the main magnetic pole and the angled surface of the trailing shield.

23. The method as recited in claim 13, further comprising forming a gap layer between the main magnetic pole and the trailing shield beyond a rear edge of the FGL in an element height direction thereof, wherein a gap distance in a direction parallel to an air bearing surface (ABS) between the trailing shield and the main magnetic pole at the ABS is less than a gap distance in the direction parallel to the ABS between the trailing shield and the main magnetic pole at a point beyond the rear edge of the FGL in the element height direction thereof.