Write heads having conducting side gap for directing current
Embodiments of the present disclosure generally relate to magnetic recording systems, and more particularly to a magnetic recording system with a current-assisted write head. The write head comprises a main pole, a trailing shield disposed above the main pole, a trailing gap disposed between the main pole and the trailing shield, a side shield surrounding three sides of the main pole, the side shield being in contact with and disposed below the trailing shield and the trailing gap, and a side gap disposed between the side shield and each of the three sides of the main pole. The side gap comprises a non-magnetic electrically-conducting material to dissipate heat away from the main pole, lowering the resistance and temperature rise due to heating. The trailing gap may further comprise a non-magnetic electrically-conducting material. The write head may have a two terminal or three terminal connection configuration.
1. A magnetic recording write head, comprising:
a main pole;
a trailing shield disposed above the main pole;
a trailing gap disposed between the main pole and the trailing shield, wherein:
a first layer of the trailing gap and a second layer of the trailing gap each comprises a non-magnetic electrically-conducting material,
the second layer of the trailing gap is disposed in contact with a first surface of the main pole and spaced from the trailing shield, and the first layer of the trailing gap is disposed adjacent to the trailing shield and spaced from the first surface of the main pole, and
a third layer of the trailing gap comprises a blocker material, the blocker material having a same cross-track width as the trailing gap;
a side shield surrounding a second surface, a third surface, and a fourth surface of the main pole, the side shield being disposed below the trailing shield and the trailing gap; and
a side gap disposed between the side shield and the second, third, and fourth surfaces of the main pole, the side gap being in contact with the trailing gap, wherein the side gap comprises a non-magnetic electrically-conducting material, and wherein the first layer of the trailing gap has a greater cross-track width than the main pole and the side gap.
2. The magnetic recording write head of claim 1 , wherein the second layer of the trailing gap has a greater cross-track width than the main pole.
3. The magnetic recording write head of claim 1 , further comprising a hot seed layer disposed between the trailing gap and the trailing shield, wherein the first layer is disposed in contact with the hot seed layer.
4. The magnetic recording write head of claim 1 , wherein the blocker material is disposed between the first layer and the second layer.
5. The magnetic recording write head of claim 1 , wherein the blocker material is disposed in a first overhang portion and a second overhang portion.
6. The magnetic recording write head of claim 1 , wherein the blocker material comprises silicon nitride.
7. The magnetic recording write head of claim 1 , wherein an insulating layer is disposed adjacent to a first end of the trailing gap and to a second end of the trailing gap.
8. The magnetic recording write head of claim 1 , wherein the write head has a three terminal connection configuration.
9. A magnetic recording drive comprising the magnetic recording write head of claim 1 .
10. A magnetic recording write head, comprising:
a main pole;
a trailing shield disposed above the main pole;
a trailing gap disposed between the main pole and the trailing shield, the trailing gap comprising a first overhang portion, a second overhang portion, and a central portion disposed between the first and second overhang portions, the central portion being disposed in contact with a first surface of the main pole, wherein the central portion of the trailing gap comprises an electrically-insulating material, and wherein a non-magnetic electrically-conducting layer extends from the first overhang portion through the central portion to the second overhang portion, the non-magnetic electrically-conducting layer having a greater cross-track width than the main pole;
a side shield surrounding a second surface, a third surface, and a fourth surface of the main pole, the side shield being disposed below the trailing shield and the trailing gap, wherein the non-magnetic electrically-conducting layer is disposed in contact with the side shield; and
a side gap disposed between the side shield and the second, third, and fourth surfaces of the main pole, the side gap comprising a non-magnetic electrically-conducting material.
11. The magnetic recording write head of claim 10 , wherein the side gap comprises a material selected from the group consisting of: Cu, Au, Ag, Ru, Cr, W, Mo, Ni, Ta, Pt, Rh, and alloys thereof.
12. The magnetic recording write head of claim 10 , wherein a first current lead is connected to the main pole and acts as a source, and a second current lead is connected to the trailing shield and acts as a ground.
13. The magnetic recording write head of claim 10 , wherein the trailing gap comprises alumina.
14. The magnetic recording write head of claim 10 , wherein
the central portion, the first overhang portion, and the second overhang portion of the trailing gap each has a same thickness, and wherein the central portion further comprises a non-magnetic electrically-conducting layer.
15. A magnetic recording drive comprising the magnetic recording write head of claim 10 .
16. A magnetic recording write head, comprising:
a main pole;
a trailing shield disposed above the main pole, the trailing shield comprising a hot seed layer;
a trailing gap disposed between the main pole and the hot seed layer, the trailing gap comprising:
a first layer disposed in contact with the hot seed layer and spaced from a first surface of the main pole,
a second layer disposed in contact with the first surface of the main pole and spaced from the hot seed layer, wherein the first and second layers of the trailing gap each comprises a non-magnetic electrically-conducting material, and
a third layer comprising a blocker material disposed between the first layer and the second layer, the third layer having a same cross-track width as the trailing gap;
a side shield surrounding a second surface, a third surface, and a fourth surface of the main pole, the side shield being disposed below the trailing shield and the trailing gap; and
a side gap disposed between the side shield and the second, third, and fourth surfaces of the main pole, the side gap being in contact with the trailing gap, wherein the side gap comprises a non-magnetic electrically-conducting material, and wherein the first and second layers of the trailing gap each has a greater cross-track width than the main pole and the side gap.
17. The magnetic recording write head of claim 16 , wherein the trailing gap comprises a material selected from the group consisting of: Cu, Au, Ag, Ru, Cr, W, Mo, Ni, Ta, Pt, Rh, and alloys thereof.
18. The magnetic recording write head of claim 16 , wherein the trailing gap and the side gap comprise the same material.
19. The magnetic recording write head of claim 16 , wherein the trailing gap and the side gap comprise different materials.
20. The magnetic recording write head of claim 16 , wherein the first layer and the second layer of the trailing gap comprise different materials.
21. The magnetic recording write head of claim 16 , wherein the blocker material is disposed in a first overhang portion and a second overhang portion of the trailing gap.
22. A magnetic recording drive comprising the magnetic recording write head of claim 16 .