Magnetic write head having a notched yoke structure with a trailing shield and method of making the same
View Patent ↗A magnetic write head for a data storage device includes a pole piece layer; a pole tip structure formed over the pole piece layer; a trailing shield formed at least in part along an air bearing surface (ABS) of the magnetic head adjacent the pole tip structure; a non-magnetic gap layer formed between the trailing shield and the pole tip structure; a yoke structure formed over at least part of the trailing shield; and a notch formed in the yoke structure adjacent the pole tip structure. Advantageously, the notch reduces magnetic flux otherwise drawn by the yoke structure in the region directly adjacent the pole tip structure. A method of making the magnetic head is also disclosed.
1. A magnetic head, comprising:
a pole piece layer;
a pole tip structure formed over the pole piece layer;
a trailing shield formed at least in part along an air bearing surface (ABS) of the magnetic head adjacent the pole tip structure;
a gap layer formed between the trailing shield and the pole tip structure;
a yoke structure;
a notch in the yoke structure which provides a separation of the yoke structure into a first yoke portion and a second yoke portion; and
the first yoke portion and the second yoke portion magnetically connecting the yoke structure to the trailing shield and flanking the pole tip structure such that the notch is adjacent the pole tip structure.
2. The magnetic head of claim 1 , wherein the notch comprises one of a U-shape, a trapezoidal shape, and a V-shape.
3. The magnetic head of claim 1 , wherein the trailing shield, the yoke structure, and the notch form a U-shape along an ABS plane.
4. The magnetic head of claim 1 , wherein the notch reduces magnetic flux otherwise drawn by the yoke structure in a region directly adjacent the pole tip structure.
5. The magnetic head of claim 1 , further comprising:
the trailing shield having a thickness defined in directions normal an ABS plane;
the trailing shield having a height defined in directions perpendicular to the thickness; and
the height of the trailing shield being at least four times the thickness.
6. The magnetic head of claim 1 , further comprising:
an edge of the pole piece layer being recessed from the ABS.
7. The magnetic head of claim 1 , wherein the pole piece layer, the pole tip structure, and the yoke structure comprise magnetic materials.
8. The magnetic head of claim 1 , further comprising:
write coils formed between the pole piece layer and the yoke structure.
9. The magnetic head of claim 1 , further comprising:
non-magnetic materials formed within the notch.
10. A disk drive, comprising:
a housing;
a magnetic disk rotatably supported in the housing;
a magnetic head;
a support mounted in the housing for supporting the magnetic head so as to be in a transducing relationship with the magnetic disk;
a spindle motor for rotating the magnetic disk;
an actuator connected to the support for moving the magnetic head to multiple positions with respect to said magnetic disk;
a processing circuit connected to the magnetic head, to the spindle motor, and to the actuator for exchanging signals with the magnetic head for controlling movement of the magnetic disk and for controlling the position of the magnetic head;
the magnetic head including:
a pole piece layer;
a pole tip structure formed adjacent the pole piece layer;
a trailing shield formed at least in part along an air bearing surface (ABS) plane of the magnetic head adjacent the pole tip structure;
a gap layer formed between the trailing shield and the pole tip structure;
a yoke structure;
a notch in the yoke structure which provides a separation of the yoke structure into a first yoke portion and a second yoke portion; and
the first yoke portion and the second yoke portion magnetically connecting the yoke structure to the trailing shield and flanking the pole tip structure such that the notch is adjacent the pole tip structure.
11. The disk drive of claim 10 , wherein the notch comprises one of a U-shape, a trapezoidal shape, and a V-shape.
12. The disk drive of claim 10 , wherein the trailing shield, the yoke structure, and the notch form a U-shape along an ABS plane.
13. The disk drive of claim 10 , wherein the notch reduces magnetic flux otherwise drawn by the yoke structure in a region directly adjacent the pole tip structure.
14. The disk drive of claim 10 , further comprising:
the trailing shield having a thickness defined in directions normal the ABS plane;
the trailing shield having a height defined in directions perpendicular the thickness; and
the height of the trailing shield being at least four times the thickness.
15. The disk drive of claim 10 , further comprising:
an edge of the pole piece layer being recessed from the ABS plane.
16. The disk drive of claim 10 , wherein the pole piece layer, the pole tip structure, and the yoke structure comprise magnetic materials.
17. The disk drive of claim 10 , further comprising:
write coils formed between the pole piece layer and the yoke structure.
18. The disk drive of claim 10 , further comprising:
non-magnetic materials formed within the notch.
19. A method of making a magnetic head, comprising:
forming a pole tip structure over at least a portion of a pole piece layer;
forming a non-magnetic gap layer over at least a portion of the pole tip structure at an air bearing surface (ABS);
forming a trailing shield over the non-magnetic gap layer at least along the ABS; and
forming a yoke structure having a notch which provides a separation of the yoke structure into a first yoke portion and a second yoke portion, the first yoke portion and the second yoke portion magnetically connecting the yoke structure to the trailing shield and flanking the pole tip structure such that the notch is adjacent the pole tip structure.
20. The method of claim 19 , wherein the act of forming the yoke structure comprises the further act of forming the notch having one of a U-shape, a trapezoidal shape, and a V-shape.
21. The method of claim 19 , wherein the act of forming the yoke structure comprises the further act of forming the notch such that the trailing shield, the yoke structure, and the notch form a U-shape along an ABS plane.
22. The method of claim 19 , further comprising:
wherein the trailing shield has a thickness defined in directions normal an ABS plane;
wherein the trailing shield has a height defined in directions perpendicular the thickness; and
wherein the height of the trailing shield is at least four times the thickness.
23. The method of claim 19 , wherein the act of forming the pole piece layer comprises forming an edge of the pole piece layer recessed from the ABS.
24. The method of claim 19 , wherein the notch reduces magnetic write flux otherwise drawn by the yoke structure in a region directly adjacent the pole tip structure.
25. The method of claim 19 , wherein the pole piece layer, the pole tip structure, and the yoke structure comprise magnetic materials.
26. The method of claim 19 , further comprising:
forming write coils between the pole piece layer and the yoke structure.
27. The method of claim 19 , further comprising:
forming non-magnetic materials within the notch.
28. The method of claim 19 , wherein the act of forming the yoke structure comprises the further act of electroplating to form the yoke structure.
29. The method of claim 19 , wherein the act of forming the trailing shield comprises the further act of electroplating to form the trailing shield.
30. The method of claim 19 , wherein the act of forming the pole tip structure comprises the act of forming alternating layers of magnetic and non-magnetic materials.