Magnetic head having thermally assisted recording device, and method of fabrication thereof
View Patent ↗A magnetic head including a media heating device that is fabricated within the magnetic head structure. The media heating device includes an electrically resistive element that is fabricated above the first magnetic pole layer close to the ABS surface of the head. A P 1 pole pedestal is fabricated above the heating element. Electrical insulation layers are fabricated beneath and above the heating element to prevent electrical shorting to the P 1 pole layer and the P 1 pole pedestal that are disposed beneath and above the heating element, respectively.
1. A magnetic head, comprising:
a first magnetic pole layer;
a first electrical insulation layer being disposed upon said first magnetic pole layer;
a second electrical insulation layer being disposed upon said first insulation layer;
a heating device being disposed upon said first electrical insulation layer and within said second electrical insulation layer, said heating device being disposed above said first magnetic pole layer;
a third electrical insulation layer being disposed upon said second electrical insulation layer, where said third electrical insulation layer is not disposed upon an upper surface of said heating device;
a fourth electrical insulation layer being disposed upon said upper surface of said heating device and upon said third electrical insulation layer;
a first magnetic pole pedestal member being disposed above said heating device, such that said heating device is disposed between said first magnetic pole layer and said first magnetic pole pedestal.
2. A magnetic head as described in claim 1 wherein said heating device includes an electrically resistive heating element.
3. A magnetic head as described in claim 2 wherein said heating device includes a pair of electrical leads, and wherein said electrically resistive heating element is disposed directly beneath said leads.
4. A magnetic head as described in claim 3 wherein said electrically resistive heating element includes an outer edge, and each of said electrical leads includes an outer edge, and wherein said outer edge of said electrically resistive heating element and said outer edges of said electrical leads are aligned in a plane.
5. A magnetic head as described in claim 2 wherein said electrically resistive heating element is a layer of electrically conductive material having a thickness of approximately 400 Å, and having a track width of approximately 2 microns and a stripe height of approximately 0.5 microns.
6. A magnetic head as described in claim 5 wherein said electrically resistive heating element is comprised of NiCr or NiFe.
7. A magnetic head as described in claim 5 wherein the magnetic head includes an air bearing surface, and wherein said heating device is disposed away from said air bearing surface, and wherein a portion of said second electrical insulation layer is disposed between said heating device and said air bearing surface.
8. A magnetic head as described in claim 1 wherein said first electrical insulation layer is thicker than said fourth electrical insulation layer.
9. A magnetic head as described in claim 8 wherein said first electrical insulation layer is approximately 1,000 Å thick, and said fourth electrical insulation layer is approximately 250 Å thick.
10. A hard disk drive including a magnetic head, comprising:
a read head element;
a write head element, including;
a first magnetic pole layer;
a first electrical insulation layer being disposed upon said first magnetic pole layer;
a second electrical insulation layer being disposed upon said first insulation layer;
a heating device being disposed upon said first electrical insulation layer and within said second electrical insulation layer, said heating device being disposed above said first magnetic pole layer;
a third electrical insulation layer being disposed upon said second electrical insulation layer, where said third electrical insulation layer is not disposed upon an upper surface of said heating device;
a fourth electrical insulation layer being disposed upon said upper surface of said heating device and upon said third electrical insulation layer;
a first magnetic pole pedestal member being disposed above said heating device, such that said heating device is disposed between said first magnetic pole layer and said first magnetic pole pedestal.
11. A hard disk drive as described in claim 10 wherein the magnetic head includes an air bearing surface, and wherein said heating device is disposed away from said air bearing surface, and wherein a portion of said second electrical insulation layer is disposed between said heating device and said air bearing surface.
12. A hard disk drive as described in claim 10 wherein said heating device includes an electrically resistive heating element.
13. A hard disk drive as described in claim 12 wherein said electrically resistive heating element is a layer of electrically conductive material having a thickness of approximately 400 Å, and having a track width of approximately 2 microns and a stripe height of approximately 0.5 microns.
14. A hard disk drive as described in claim 13 wherein said electrically resistive heating element is comprised of NiCr or NiFe.
15. A hard disk drive as described in claim 10 wherein said first electrical insulation layer is thicker than said fourth electrical insulation layer.
16. A hard disk drive as described in claim 15 wherein said first electrical insulation layer is approximately 1,000 Å thick, and said fourth electrical insulation layer is approximately 250 Å thick.