Magnetic recording head with non-magnetic conductive structure surrounding a main pole and contacting a spin torque oscillator
The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, an STO disposed between the trailing shield and the main pole, and a non-magnetic conductive structure (or non-magnetic conductive layers) adjacent to the main pole and in contact with the STO. The non-magnetic conductive structure provides additional paths for electrical currents to flow to the STO. The non-magnetic conductive structure enables higher current density to the STO without creating hot spots at the MFS. Maximum current efficiency and uniformity can be achieved with the non-magnetic conductive structure.
1. A magnetic recording head, comprising:
a main pole;
a trailing shield;
a spin torque oscillator between the main pole and the trailing shield, the spin torque oscillator comprising a first width proximate the main pole and a second width proximate the trailing shield at a media facing surface, wherein the first width is larger than the second width;
a non-magnetic conductive structure adjacent to the main pole, wherein the non-magnetic conductive structure is in contact with the spin torque oscillator at the media facing surface;
a dielectric layer disposed between the non-magnetic conductive structure and the main pole; and
a current source connected to the trailing shield and the non-magnetic conductive structure.
2. The magnetic recording head of claim 1 , wherein the main pole further comprises a first surface, a second surface adjacent the first surface, a third surface connected to the second surface and a fourth surface opposite the third surface.
3. The magnetic recording head of claim 2 , wherein the non-magnetic conductive structure at least partially encloses the third surface and fourth surface of the main pole.
4. The magnetic recording head of claim 1 , wherein the non-magnetic conductive structure contacts the spin torque oscillator on two surfaces of the non-magnetic conductive structure.
5. The magnetic recording head of claim 1 , wherein the non-magnetic conductive structure comprises a first non-magnetic conductive layer and a second non-magnetic conductive layer.
6. The magnetic recording head of claim 5 , wherein each of the first non-magnetic conductive layer and second non-magnetic conductive layer is in contact with the spin torque oscillator.
7. The magnetic recording head of claim 6 , wherein the first non-magnetic conductive layer and second non-magnetic conductive layer are not in contact with each other.
8. A method to produce a magnetic recording head, comprising:
fabricating a leading shield;
disposing a first dielectric layer adjacent the leading shield;
fabricating a non-magnetic conductive structure adjacent the first dielectric layer;
disposing a second dielectric layer adjacent the non-magnetic conductive structure;
placing a main pole adjacent the second dielectric layer;
disposing a spin torque oscillator in contact with the non-magnetic conductive structure and the main pole, wherein the non-magnetic conductive structure is in contact with the spin torque oscillator at a media facing surface;
disposing a trailing shield adjacent the spin torque oscillator; and
connecting a current source to the trailing shield and the non-magnetic conductive structure.
9. The method of claim 8 , wherein fabricating the non-magnetic conductive structure comprises fabrication of the non-magnetic conductive structure from a material comprising at least one of NiTa, Cr, Cu, Rh, NiTa/Ru, Cr/Cu, or Cr/Rh.
10. The method of claim 8 , wherein fabricating the non-magnetic conductive structure comprises fabricating a first non-magnetic conductive layer and a second non-magnetic conductive layer, the first non-magnetic conductive layer and the second non-magnetic conductive layer being disposed adjacent to the main pole.
11. The method of claim 10 , wherein fabricating the non-magnetic conductive structure further comprises disposing a third dielectric layer between the first non-magnetic conductive layer and the second non-magnetic conductive layer.
12. The method of claim 8 , wherein the spin torque oscillator comprises a first width proximate the main pole and a second width proximate the trailing shield at a media facing surface, wherein the first width is larger than the second width.
13. A data storage device comprising:
a control unit;
a drive motor communicatively coupled to the control unit;
a disk, having a disk surface, coupled to the drive motor via a spindle;
an actuator arm communicatively coupled to the control unit via an actuator; and
a magnetic head assembly coupled to the actuator arm, the magnetic head assembly comprising:
a read head; and
a magnetic recording head comprising:
a main pole;
a trailing shield;
a spin torque oscillator between the main pole and the trailing shield, the spin torque oscillator being disposed in contact with the main pole;
a non-magnetic conductive structure adjacent to the main pole, wherein the non-magnetic conductive structure is in contact with the spin torque oscillator at a media facing surface;
a first dielectric layer disposed between the non-magnetic conductive structure and the main pole; and
a current source connected to the trailing shield and the non-magnetic conductive structure.
14. The data storage device of claim 13 , wherein the non-magnetic conductive structure comprises NiTa, Cr, Cu, Rh, NiTa/Ru, Cr/Cu, or Cr/Rh.
15. The data storage device of claim 13 , wherein the non-magnetic conductive structure is comprised of a first non-magnetic conductive layer and a second non-magnetic conductive layer, the first non-magnetic conductive layer and the second non-magnetic conductive layer adjacent to the main pole.
16. The data storage device of claim 15 , further comprising a second dielectric layer disposed between the first non-magnetic conductive layer and second non-magnetic conductive layer.
17. The data storage device of claim 16 in which the first non-magnetic conductive layer and second non-magnetic conductive layers are comprised of different non-magnetic conductive materials.
18. A data storage device comprising:
a control unit;
a drive motor communicatively coupled to the control unit;
a disk, having a disk surface, coupled to the drive motor via a spindle;
an actuator arm communicatively coupled to the control unit via an actuator; and
a magnetic head assembly coupled to the actuator arm, the magnetic head assembly comprising:
a read head; and
a magnetic recording head comprising:
a main pole;
a trailing shield;
a spin torque oscillator between the main pole and the trailing shield;
a non-magnetic conductive structure adjacent to the main pole, wherein the non-magnetic conductive structure is in contact with the spin torque oscillator at a media facing surface;
a first dielectric layer disposed between the non-magnetic conductive structure and the main pole; and
a current source connected to the trailing shield and the non-magnetic conductive structure, wherein the spin torque oscillator comprises a first width proximate the main pole and a second width proximate the trailing shield at the media facing surface, and wherein the first width is larger than the second width.