Apparatus with a plurality of heat sinks

Patent metadata

Field	Value
Publication number	US-9019661-B2
Application number	US-201313961644-A
Country	US
Kind code	B2
Filing date	Aug 7, 2013
Priority date	Aug 7, 2013
Publication date	Apr 28, 2015
Grant date	Apr 28, 2015

Abstract

An apparatus comprises a write transducer comprising a write pole having a tip portion proximate a media-facing surface and a return pole spaced apart from the write pole in a downtrack direction. The apparatus further includes first and second heat sink portions. The first heat sink portion surrounds a first side of the tip portion that faces the return pole and extends outwards from the tip portion in a cross-track direction. The second heat sink portion comprises a first surface proximate the first heat sink portion and a second surface proximate the return pole and extends outwards in the cross-track direction further than the first heat sink portion.

First claim

What is claimed is:

1. An apparatus, comprising:
a write transducer comprising a write pole having a tip portion proximate a media-facing surface and a return pole spaced apart from the write pole in a downtrack direction;
a near-field transducer proximate the write transducer;
a first heat sink portion surrounding a first side of the tip portion that faces the return pole, the first heat sink portion extending outwards from the tip portion in a cross-track direction; and
a second heat sink portion comprising a first surface proximate the first heat sink portion and a second surface proximate the return pole, the second heat sink portion extending outwards in the cross-track direction further than the first heat sink portion.

2. The apparatus of claim 1 ,
wherein the near-field transducer is proximate a second side of the tip portion that faces away from the return pole.

3. The apparatus of claim 2 , wherein the write pole comprises at least one of a taper and a flare coupled to the tip portion, the at least one of the taper and the flare increasing a mass of thermally expansive material proximate the media-facing surface.

4. The apparatus of claim 3 , wherein the taper is at least 100 nm wide and located at least 10 nm from the media-facing surface.

5. The apparatus of claim 3 , wherein the taper comprises a magnetic material that has a lower magnetic moment than a material of the tip portion.

6. The apparatus of claim 2 , wherein the first heat sink portion has a reduced cross section proximate the tip portion, wherein the reduced cross section increases a thermally-induced protrusion of the tip portion that shelters the near-field transducer.

7. The apparatus of claim 1 , wherein the first heat sink portion comprises a first metallic material and the second heat sink portion comprises a second metallic material different than the first metallic material.

8. The apparatus of claim 7 , wherein the first metallic material comprises a refractory material, and wherein the second metallic material has a higher coefficient of thermal expansion than the first metallic material.

9. The apparatus of claim 1 , wherein a first throat height of the return pole near the second heat sink portion is narrower than a second throat height of the return pole located away from the second heat sink portion in a cross-track direction.

10. An apparatus, comprising:
a write transducer comprising a write pole having a tip portion proximate a media-facing surface and a return pole spaced apart from the write pole in a downtrack direction;
a first heat sink comprising a first metallic material, the first heat sink surrounding a first side of the tip portion that faces the return pole, the first heat sink extending outwards from the tip portion in a cross-track direction; and
a second heat sink comprising:
a second metallic material different than the first metallic material;
a first surface thermally coupled to the first heat sink; and
a second surface thermally coupled to the return pole.

11. The apparatus of claim 10 , comprising:
a near-field transducer proximate a second side of the tip portion that faces away from the return pole.

12. The apparatus of claim 11 , wherein the write pole comprises at least one of a taper and a flare coupled to the tip portion, the at least one of the taper and the flare increasing a mass of thermally expansive material proximate the media-facing surface.

13. The apparatus of claim 12 , wherein the taper comprises a magnetic material that has a lower magnetic moment than a material of the tip portion.

14. The apparatus of claim 11 , wherein the first heat sink has a reduced cross section proximate the tip portion, wherein the reduced cross section increases a thermally-induced protrusion of the tip portion that shelters the near-field transducer.

15. The apparatus of claim 10 , wherein the second heat sink extends outwards in the cross-track direction further than the first heat sink.

16. The apparatus of claim 10 , wherein the first metallic material comprises a refractory material, and wherein the second metallic material has a higher coefficient of thermal expansion than the first metallic material.

17. The apparatus of claim 10 , wherein the first surface contacts the first heat sink.

18. The apparatus of claim 10 , wherein the second surface contacts the return pole.

19. The apparatus of claim 10 , wherein a first throat height of the return pole near the second heat sink is narrower than a second throat height of the return pole located away from the second heat sink in a cross-track direction.

20. A method comprising:
energizing a write pole having a tip portion proximate a media-facing surface and a return pole spaced apart from the write pole in a downtrack direction, the write pole applying a magnetic field to a magnetic media proximate the media-facing surface;
heating the magnetic media while the magnetic field is being applied via a near-field transducer; and
dissipating heat generated while the magnetic field is being applied via:
a first heat sink portion surrounding a first side of the tip portion that faces the return pole, the first heat sink portion extending outwards from the tip portion in a cross-track direction; and
a second heat sink portion between the first heat sink portion and the return pole, the second heat sink portion extending outwards in the cross-track direction further than the first heat sink portion.

Assignees

• Seagate Technology Llc

Inventors

• Rea Chris
• Jandric Zoran
• Zhou Hua

Classifications

• G11B5/314 Primary

  where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence) · CPC title

• G11B13/08 Primary

  using near-field interactions or transducing means and at least one other method or means for recording or reproducing · CPC title

• G11B5/6088

  Optical waveguide in or on flying head · 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