Thermally assisted recording head having recessed waveguide with near field transducer and methods of making same

• US 8,619,535 B2
• Filed: 04/03/2012
• Issued: 12/31/2013
• Est. Priority Date: 12/31/2008
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Inventors: Balamane, Hamid, Boone, Thomas Dudley Jr., Robertson, Neil Leslie, Stipe, Barry Cushing, Strand, Timothy Carl
• Primary Examiner(s): BERNARDI, BRENDA C
• Application Number:
  US13/438,811
• Publication Number:
  US 20120218871A1
• Time in Patent Office: 637 Days
• Field of Search: 369/13.02, 369/13.32, 369/13.33, 369/112.27
• US Class Current: 369/112.27
• CPC Class Codes: G11B 2005/0021 Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
• CPC Class Codes: G11B 5/314 where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers G11B5/3196 takes precedence
• CPC Class Codes: G11B 5/3163 Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
• CPC Class Codes: G11B 5/6088 Optical waveguide in or on flying head

Abstract

An apparatus according to one embodiment includes a near field transducer comprising a conductive metal film; and an optical waveguide for illumination of the near field transducer, a light guiding core layer of the optical waveguide being spaced from the near field transducer by less than about 100 nanometers and greater than 0 nanometers, wherein a longitudinal axis of the optical waveguide is substantially perpendicular to an air bearing surface.

Claims

1. An apparatus, comprising:

a near field transducer comprising a conductive metal film; and

an optical waveguide for illumination of the near field transducer, a light guiding core layer of the optical waveguide being spaced from the near field transducer by less than about 100 nanometers and greater than 0 nanometers,

wherein a longitudinal axis of the optical waveguide is substantially perpendicular to an air bearing surface.

2. The apparatus as recited in claim 1, wherein the conductive metal film has a C aperture formed therein.

3. The apparatus as recited in claim 1, wherein the conductive metal film has an E shape.

4. The apparatus as recited in claim 1, wherein the conductive metal film includes wings extending from the main body.

5. The apparatus as recited in claim 4, further comprising a layer of magnetic material extending at least a portion of a distance between the wings.

6. The apparatus as recited in claim 1, wherein the conductive metal film is generally non-triangular.

7. The apparatus as recited in claim 1, wherein the optical waveguide further comprises cladding layers enclosing the core layer.

8. The apparatus as recited in claim 7, wherein at least one of the cladding layers is positioned in a location selected from a group consisting of between the core layer and the near field transducer, and below the near field transducer.

9. The apparatus as recited in claim 8, wherein the at least one of the cladding layers is directly adjacent a side of the core layer extending parallel to an axis of the core layer and a side of the core layer extending perpendicular to the axis of the core layer.

10. The apparatus as recited in claim 1, wherein at least a portion of the near field transducer is positioned between the air bearing surface and the core layer.

11. The apparatus as recited in claim 1, further comprising:

a magnetic head, the near field transducer being in the magnetic head;

a magnetic medium;

a drive mechanism for passing the magnetic medium over the magnetic head; and

a controller electrically coupled to the magnetic head for controlling operation of the magnetic head.

12. An apparatus, comprising:

a near field transducer comprising a conductive metal film;

an optical waveguide for illumination of the near field transducer, a light guiding core layer of the optical waveguide being spaced from the near field transducer by less than about 100 nanometers, wherein a longitudinal axis of the optical waveguide is substantially perpendicular to an air bearing surface;

a magnetic head, the near field transducer being in the magnetic head;

a magnetic medium;

a drive mechanism for passing the magnetic medium over the magnetic head; and

a controller electrically coupled to the magnetic head for controlling operation of the magnetic head.

13. The apparatus as recited in claim 12, wherein the conductive metal film has at least one of a C aperture formed therein and an E shape.

14. The apparatus as recited in claim 12, wherein at least a portion of the near field transducer is positioned between the air bearing surface and the core layer.

15. The apparatus as recited in claim 12, wherein the optical waveguide further comprises cladding layers enclosing the core layer, wherein at least one of the cladding layers is the layer positioned between the core layer and the near field transducer.

16. The apparatus as recited in claim 15, wherein the optical waveguide further comprises cladding layers enclosing the core layer, wherein the core layer is above two cladding layers.

17. A method, comprising:

forming a near field transducer structure having an air bearing surface (ABS) side and a second side opposite the ABS side;

forming a cladding layer adjacent the second side of the near field transducer structure, wherein a portion of the cladding layer extends along the near field transducer structure; and

forming a core layer adjacent to the portion of the cladding layer extending along the near field transducer structure and above a second portion of the cladding layer, the core layer being separated from the near field transducer via the cladding layer,

wherein a longitudinal axis of the core layer is substantially perpendicular to the ABS side of the near field transducer.

18. The method as recited in claim 17, wherein the near field transducer structure has at least one of a C aperture formed therein and an E shape.

19. The method as recited in claim 17, wherein at least a portion of the near field transducer is positioned between the air bearing surface and the core layer.

20. The method as recited in claim 17, wherein at least a portion of the near field transducer structure includes a magnetic material.

21. A method, comprising:

forming a lower cladding layer;

forming a near field transducer structure above the lower cladding layer;

forming a second cladding layer adjacent the near field transducer structure and above the lower cladding layer, wherein a portion of the second cladding layer extends along the near field transducer structure; and

forming a core layer above the second cladding layer.

22. The method as recited in claim 21, wherein the near field transducer structure has a C aperture formed therein, wherein a longitudinal axis of the core layer is substantially perpendicular to an ABS side of the near field transducer.

23. The method as recited in claim 21, wherein the near field transducer structure includes a conductive metal film having an E shape.