Magnetic head having reduced induction coil electrical resistance and method for the fabrication thereof
A magnetic head including an induction coil having coil turns that are disposed between two magnetic poles of the magnetic head. The coil turns include a lower coil turn portion and an upper coil turn portion. In fabricating the induction coil, the lower coil turn portion is fabricated first, and the upper coil turn portion is fabricated directly upon the lower coil turn portion. The lower coil turn portion may be fabricated using damascene methods and the upper coil turn portion may be fabricated utilizing photolithographic methods. The lower coil turn portion and the upper coil turn portion of the induction coil turns are electrically connected, such that the thickness of the overall induction coil turns is increased. As a result, the electrical resistance of the coil turns is decreased, and heat generated in the coil is reduced.
1. A magnetic head, comprising:
at least two magnetic poles;
a first induction coil being disposed between said magnetic poles;
a second induction coil being disposed between said magnetic poles; and
an insulating layer between the first and second induction coils,
said second induction coil including coil turns having a lower coil turn portion and an upper coil turn portion, where said upper coil turn portion is disposed directly upon said lower coil turn portion such that said second induction coil is thicker than said first induction coil.
2. A magnetic head as described in claim 1 , wherein said lower coil turn portion includes a seed layer.
3. A magnetic head as described in claim 2 wherein said upper coil turn portion includes a seed layer that is disposed upon said lower coil turn portion.
4. A magnetic head as described in claim 1 , wherein the insulating layer is a write gap layer.
5. A magnetic head as described in claim 1 wherein said lower coil turn portion is comprised of copper and said upper coil turn portion is comprised of copper.
6. A magnetic head, comprising:
a substrate base;
a first magnetic pole (P1) being disposed above said substrate base;
a P1 pole pedestal being disposed upon said P1 pole;
a first etch stop layer being disposed upon said P1 pole;
a first electrical insulation layer being disposed upon said first etch stop layer;
a first induction coil layer being disposed within said first electrical insulation layer;
a write gap layer being disposed above said first induction coil layer;
a second etch stop layer being disposed upon said write gap layer;
a second electrical insulation layer being disposed upon said second etch stop layer;
lower coil turns of a second induction coil layer being disposed within said second electrical insulation layer;
a third insulation layer being disposed above said second insulation layer;
upper coil turns of said second induction coil layer being disposed within said third insulation layer, said upper coil turns being disposed upon said lower coil turns and in electrical current flow communication therewith such that said second induction coil layer is thicker than said first induction coil layer.
7. A magnetic head as described in claim 6 , wherein said lower coil turns include a seed layer.
8. A magnetic head as described in claim 6 wherein said upper coil turns include a seed layer.
9. A magnetic head as described in claim 6 , wherein said second induction coil layer includes a first seed layer, said lower coil turns, a second seed layer that is disposed upon said lower coil turns and said upper coil turns that are disposed upon said second seed layer.
10. A magnetic head as described in claim 6 , wherein said lower coil turns are fabricated utilizing a damascene method and said upper coil turns are fabricated utilizing a photolithographic method.
11. A magnetic head as described in claim 6 wherein said lower coil turns are comprised of copper and said upper coil turns are comprised of copper.
12. A hard disk drive comprising:
a motor for rotating a spindle;
a magnetic medium disk mounted on said spindle;
an actuator assembly including a magnetic head for writing magnetic information on said disk, said magnetic head including:
at least two magnetic poles;
a first induction coil being disposed between said magnetic poles;
a second induction coil being disposed between said magnetic poles; and
an insulating layer between the first and second induction coils,
said second induction coil including coil turns having a lower coil turn portion and an upper coil turn portion, where said upper coil turn portion is disposed directly upon said lower coil turn portion such that said second induction coil is thicker than said first induction coil.
13. A hard disk drive as described in claim 12 , wherein said lower coil turn portion includes a seed layer.
14. A hard disk drive as described in claim 13 wherein said upper coil turn portion includes a seed layer that is disposed directly upon said lower coil turn portion.
15. A hard disk drive as described in claim 12 , wherein the insulating layer is a write gap layer.
16. A hard disk drive as described in claim 12 wherein said lower coil turn portion is comprised of copper and said upper coil turn portion is comprised of copper.
17. A method for fabricating a magnetic head, comprising the steps of:
fabricating a first magnetic pole;
fabricating a first induction coil structure above said first magnetic pole;
fabricating an insulation layer above said first induction coil structure;
fabricating a second induction coil structure above said insulation layer including:
fabricating lower induction coil turns of said second induction coil structure upon said insulation layer;
fabricating upper induction coil turns of said second induction coil structure directly upon said lower induction coil turns such that said second induction coil structure is thicker than said first induction coil structure;
fabricating a second magnetic pole above said upper induction coil turns.
18. A method for fabricating a magnetic head as described in claim 17 wherein said upper induction coil turns include a seed layer, and wherein the steps of fabricating said upper induction coil turns includes:
depositing said seed layer upon said lower induction coil turns; and
electroplating a remainder of said upper induction coil turns upon said seed layer.
19. A method for fabricating a magnetic head as described in claim 17 , wherein said lower induction coil turns are fabricated utilizing a damascene method and said upper induction coil turns are fabricated utilizing a photolithographic method.
20. A method for fabricating a magnetic head as described in claim 17 wherein said lower induction coil turns are comprised of copper and said upper induction coil turns are comprised of copper.