MAMR head with recessed STO

• US 9,202,528 B2
• Filed: 09/27/2013
• Issued: 12/01/2015
• Est. Priority Date: 09/27/2013
• 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: Furukawa, Masaru, Li, Jianhua, Shiimoto, Masato, Matsubara, Masato
• Primary Examiner(s): CASTRO, ANGEL A
• Application Number:
  US14/040,151
• Publication Number:
  US 20150092292A1
• Time in Patent Office: 795 Days
• Field of Search: 360/119.03, 360/119.04, 360/125.3
• US Class Current: 1/1
• CPC Class Codes: G11B 2005/0024 Microwave assisted recording
• CPC Class Codes: G11B 33/1433 by reducing the effects of the thermal expansion
• 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

Embodiments of the present invention generally relate to a microwave assisted magnetic recording (MAMR) head. The MAMR head includes a main pole, a trailing shield, and a spin torque oscillator (STO) disposed between the main pole and the trailing shield. The STO is recessed from an air bearing surface.

Claims

1. A microwave assisted magnetic recording head, comprising:

a main pole;

a trailing shield; and

a spin torque oscillator positioned between the main pole and the trailing shield, wherein the spin torque oscillator has a surface for facing a magnetic disk and the surface is recessed from an air bearing surface, and wherein a distance between the surface of the spin torque oscillator and the air bearing surface ranges from 0.2 nm to 2 nm.

2. The microwave assisted magnetic recording head of claim 1, wherein the surface of the spin torque oscillator is linear and substantially parallel to the air bearing surface.

3. The microwave assisted magnetic recording head of claim 1, wherein the trailing shield has an end including the air bearing surface.

4. The microwave assisted magnetic recording head of claim 1, wherein the main pole has an end including the air bearing surface.

5. The microwave assisted magnetic recording head of claim 1, further comprising an insulating material disposed adjacent the spin torque oscillator in a cross-track direction, wherein the insulating material includes the air bearing surface.

6. The microwave assisted magnetic recording head of claim 1, wherein the spin torque oscillator comprises at least two magnetic layers and a nonmagnetic layer disposed therebetween.

7. The microwave assisted magnetic recording head of claim 1, wherein the spin torque oscillator comprises at least two magnetic layers and a nonmagnetic layer disposed therebetween.

8. The microwave assisted magnetic recording head of claim 7, wherein the surface of the spin torque oscillator is curved, and a peak that is the farthest from the air bearing surface is located within the nonmagnetic layer.

9. The microwave assisted magnetic recording head of claim 1, wherein the spin torque oscillator has a breakdown ratio of less than 0.02.

10. The microwave assisted magnetic recording head of claim 1, wherein the microwave assisted magnetic recording head has a signal-to-noise ratio of greater than 12.

11. A microwave assisted magnetic recording head, comprising:

a main pole having an end including an air bearing surface;

a trailing shield having an end including the air bearing surface; and

a spin torque oscillator positioned between the main pole and the trailing shield, wherein the spin torque oscillator has a surface for facing a magnetic disk and the surface is recessed from the air bearing surface, and wherein a distance between the surface of the spin torque oscillator and the air bearing surface ranges from 0.2 nm to 2 nm.

12. The microwave assisted magnetic recording head of claim 11, wherein the surface of the spin torque oscillator is linear and substantially parallel to the air bearing surface.

13. The microwave assisted magnetic recording head of claim 11, further comprising an insulating material disposed adjacent the spin torque oscillator in a cross-track direction, wherein the insulating material includes the air bearing surface.

14. The microwave assisted magnetic recording head of claim 11, wherein the spin torque oscillator comprises at least two magnetic layers and a nonmagnetic layer disposed therebetween.

15. The microwave assisted magnetic recording head of claim 14, wherein the surface of the spin torque oscillator is curved, and a peak that is the farthest from the air bearing surface is located within the nonmagnetic layer.

16. The microwave assisted magnetic recording head of claim 11, wherein the spin torque oscillator has a breakdown ratio of less than 0.02.

17. The microwave assisted magnetic recording head of claim 11, wherein the microwave assisted magnetic recording head has a signal-to-noise ratio of greater than 12.

18. A microwave assisted magnetic recording head, comprising:

a main pole having an end including an air bearing surface;

a trailing shield;

a spin torque oscillator positioned between the main pole and the trailing shield, wherein the spin torque oscillator has a surface for facing a magnetic disk and the surface is recessed from the air bearing surface, and wherein a distance between the surface of the spin torque oscillator and the air bearing surface ranges from 0.2 nm to 2 nm; and

an insulating material disposed adjacent the spin torque oscillator in a cross-track direction.

19. The microwave assisted magnetic recording head of claim 18, wherein the insulating material includes the air bearing surface.

20. The microwave assisted magnetic recording head of claim 18, wherein the spin torque oscillator comprises at least two magnetic layers and a nonmagnetic layer disposed therebetween.