MAMR head with recessed STO
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.
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.