Magnetic writer coil incorporating integral cooling fins

Patent metadata

Field	Value
Publication number	US-10074386-B1
Application number	US-201615095888-A
Country	US
Kind code	B1
Filing date	Apr 11, 2016
Priority date	May 19, 2015
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A slider is configured to interact with a magnetic recording medium and comprises an air bearing surface (ABS). A writer is provided on the slider and comprises a write pole terminating at or near the ABS, a return pole proximate the write pole, and a write coil arrangement provide around the write pole. The write coil arrangement comprises lower and upper write coils each having a generally circularly-shaped periphery, and a plurality of spaced-apart cooling fins connected to and projecting outwardly from the periphery of each of the lower and upper write coils.

First claim

What is claimed is:

1. An apparatus, comprising: a slider configured to interact with a magnetic recording medium and comprising an air bearing surface (ABS); a writer provided on the slider and comprising: a write pole terminating at or near the ABS; a return pole proximate the write pole; and a write coil arrangement provided around the write pole and comprising: lower and upper write coils each having a generally circularly-shaped periphery; and a plurality of spaced-apart cooling fins connected to and projecting outwardly from the periphery of each of the lower and upper write coils; wherein: the periphery of each of the lower and upper write coil defines an arc originating at a first location of the ABS and terminating at a second location of the ABS: the cooling fins are distributed along the arc; and the cooling fins are configured to conduct negligible or no current when the write coil arrangement is energized.

2. The apparatus of claim 1 , wherein the cooling fins are formed from the same material used to form the lower and upper write coils.

3. The apparatus of claim 1 , wherein at least some of the cooling fins have a length along a longitudinal axis of the cooling fins ranging between about 40 and 90 μm.

4. The apparatus of claim 1 , wherein the cooling fins have a generally trapezoidal shape.

5. The apparatus of claim 1 , wherein:
the cooling fins have a proximal end adjacent the write coil periphery and a distal terminal end;
the proximal end has a height ranging between about 4 and 18 μm; and
the distal terminal end has a height ranging between about 2 and 15 μm.

6. The apparatus of claim 1 , wherein at least some of the cooling fins of the lower and upper write coils are radially staggered from another.

7. The apparatus of claim 1 , wherein:
the slider comprises a plurality of thermally conductive structures spaced apart from the lower and upper write coils; and
at least some of the plurality of cooling fins are thermally coupled to the thermally conductive structures.

8. The apparatus of claim 1 , wherein:
the slider comprises a plurality of thermally conductive structures spaced apart from the lower and upper write coils; and
at least some of the plurality of cooling fins extend from the write coil periphery to a location of the slider adjacent to, but spaced apart from, the thermally conductive structures.

9. The apparatus of claim 8 , wherein the plurality of thermally conductive structures comprises metallic vias that extend at least partially through the slider.

10. The apparatus of claim 8 , wherein the at least some of the plurality of cooling fins comprise an enlarged distal tip region that conforms in shape to that of a periphery of the thermally conductive structures.

11. The apparatus of claim 10 , further comprising a thermally conductive dielectric material between a distal tip of the at least some of the plurality of cooling fins and the thermally conductive structures.

12. The apparatus of claim 1 , further comprising:
a near-field transducer provided on the slider proximate the write pole and the ABS; and
an optical waveguide provided on the slider proximate the near-field transducer.

13. An apparatus, comprising: a slider configured to interact with a magnetic recording medium, the slider comprising an air bearing surface (ABS) and a plurality of thermally conductive structures; a writer provided on the slider and comprising: a write pole terminating at or near the ABS; a return pole proximate the write pole; and a write coil arrangement provided around the write pole and comprising: lower and upper write coils each having a generally circularly-shaped periphery; and a plurality of spaced-apart cooling fins connected to and projecting outwardly from the periphery of each of the lower and upper write coils; wherein at least some of the plurality of cooling fins are thermally coupled to the thermally conductive structures; and wherein the periphery of each of the lower and upper write coil defines an arc originating at a first location of the ABS and terminating at a second location of the ABS, the cooling fins are distributed along the arc, and the cooling fins are configured to conduct negligible or no current when the write coil arrangement is energized.

14. The apparatus of claim 13 , wherein the write coil arrangement is a planar write coil arrangement.

15. The apparatus of claim 13 , wherein the write coil arrangement is a helical write coil arrangement.

16. The apparatus of claim 13 , wherein that at least some of the plurality of cooling fins extend from the write coil periphery to a location of the slider adjacent to, but spaced apart from, the thermally conductive structures.

17. The apparatus of claim 13 , wherein the plurality of thermally conductive structures comprise metallic vias that extend through the slider.

18. The apparatus of claim 13 , wherein the at least some of the plurality of cooling fins comprise an enlarged distal tip region that conforms in shape to that of a periphery of the thermally conductive structures.

19. The apparatus of claim 13 , further comprising a thermally conductive dielectric material between a distal tip of the at least some of the plurality of cooling fins and the thermally conductive structures.

20. The apparatus of claim 13 , further comprising:
a near-field transducer provided on the slider proximate the write pole and the ABS; and
an optical waveguide provided on the slider proximate the near-field transducer.

Assignees

• Seagate Technology Llc

Inventors

• Wessel James Gary
• Andruet Raul Horacio

Classifications

• G11B33/1426

  by cooling plates, e.g. fins · CPC title

• G11B5/3123 Primary

  by using special coil configurations or conductors · CPC title

• G11B5/1278

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title

• G11B5/4866

  the arm comprising an optical waveguide, e.g. for thermally-assisted recording · CPC title

• G11B2005/0021

  Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal · CPC title