Magnetic head with assisted magnetic recording
A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield. The electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion includes at least one electrically conductive, non-magnetic material layer. The main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.
1. A magnetic head, comprising:
a main pole, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield, wherein the trailing shield has a surface at the ABS;
an electrically conductive, non-magnetic material portion disposed between the main pole and the trailing shield, wherein the electrically conductive, non-magnetic material portion is recessed from the ABS; and
a spin torque oscillator coupled between the main pole and the trailing shield, wherein the spin torque oscillator is spaced from the electrically conductive, non-magnetic material portion.
2. The magnetic head of claim 1 , wherein the electrically conductive, non-magnetic material portion comprises copper, tungsten, ruthenium, or chromium.
3. The magnetic head of claim 1 , wherein the electrically conductive, non-magnetic material portion comprises a non-magnetic metal.
4. The magnetic head of claim 1 , wherein the electrically conductive, non-magnetic material portion comprises a non-magnetic metal alloy.
5. A hard disk drive comprising: a magnetic head, comprising:
a main pole, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield, wherein the trailing shield has a surface at the ABS;
an electrically conductive, non-magnetic material portion disposed between the main pole and the trailing shield, wherein the electrically conductive, non-magnetic material portion is recessed from the ABS; and
a spin torque oscillator coupled between the main pole and the trailing shield, wherein the spin torque oscillator is spaced from the electrically conductive, non-magnetic material portion.
6. A magnetic head, comprising:
a main pole, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield, wherein the trailing shield has a surface at the ABS;
an electrically conductive, non-magnetic material portion disposed between the main pole and the trailing shield, wherein the electrically conductive, non-magnetic material portion is recessed from the ABS; and
a spin torque oscillator coupled between the main pole and the trailing shield, wherein the spin torque oscillator has a surface at the ABS, and wherein the spin torque oscillator is spaced from the electrically conductive, non-magnetic material portion.
7. The magnetic head of claim 6 , wherein the spin torque oscillator comprises:
a non-magnetic conductive seed layer;
a spin polarized layer; and
a field generating layer.
8. The magnetic head of claim 7 , wherein the non-magnetic conductive seed layer is disposed on the main pole.
9. The magnetic head of claim 7 , wherein the non-magnetic conductive seed layer comprises Cr, Ru, W, or Cu.
10. The magnetic head of claim 7 , wherein the spin polarized layer comprises a nickel-iron alloy.
11. The magnetic head of claim 7 , further comprising a non-magnetic conductive spacer layer disposed between the spin polarized layer and the field generating layer.
12. The magnetic head of claim 11 , wherein the non-magnetic conductive spacer layer comprises Cu.
13. A hard disk drive comprising: a magnetic head, comprising:
a main pole, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield, wherein the trailing shield has a surface at the ABS;
an electrically conductive, non-magnetic material portion disposed between the main pole and the trailing shield, wherein the electrically conductive, non-magnetic material portion is recessed from the ABS; and
a spin torque oscillator coupled between the main pole and the trailing shield, wherein the spin torque oscillator has a surface at the ABS, and wherein the spin torque oscillator is spaced from the electrically conductive, non-magnetic material portion.
14. A magnetic head, comprising:
a main pole, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield, wherein the trailing shield has a surface at the ABS;
an electrically conductive, non-magnetic material portion disposed between the main pole and the trailing shield, wherein the electrically conductive, non-magnetic material portion is recessed from the ABS, wherein the electrically conductive, non-magnetic material portion is in contact with the trailing shield; and
a spin torque oscillator coupled between the main pole and the trailing shield, wherein the spin torque oscillator is spaced from the electrically conductive, non-magnetic material portion.
15. The magnetic head of claim 14 , wherein the electrically conductive, non-magnetic material portion is spaced from the main pole.
16. The magnetic head of claim 14 , further comprising a conductive layer stack coupled between the main pole and the electrically conductive, non-magnetic material portion.
17. The magnetic head of claim 16 , further comprising a dielectric spacer disposed between the conductive layer stack and the spin torque oscillator.
18. The magnetic head of claim 17 , wherein the spin torque oscillator has a surface disposed at the ABS.
19. A hard disk drive comprising: a magnetic head, comprising:
a main pole, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield, wherein the trailing shield has a surface at the ABS;
an electrically conductive, non-magnetic material portion disposed between the main pole and the trailing shield, wherein the electrically conductive, non-magnetic material portion is recessed from the ABS, wherein the electrically conductive, non-magnetic material portion is in contact with the trailing shield; and
a spin torque oscillator coupled between the main pole and the trailing shield, wherein the spin torque oscillator is spaced from the electrically conductive, non-magnetic material portion.