Near-field transducer with recessed region

Patent metadata

Field	Value
Publication number	US-2016133291-A1
Application number	US-201514920917-A
Country	US
Kind code	A1
Filing date	Oct 23, 2015
Priority date	Nov 11, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

A near-field transducer is situated at or proximate an air bearing surface of the apparatus and configured to facilitate heat-assisted magnetic recording on a medium. The near-field transducer includes an enlarged region comprising plasmonic material and having a first end proximate the air bearing surface. The near-field transducer also includes a disk region adjacent the enlarged region and having a first end proximate the air bearing surface. The disk region comprises plasmonic material. A peg region extends from the first end of the disk region and terminates at or proximate the air bearing surface. The near-field transducer further includes a region recessed with respect to the peg region. The recessed region is located between the peg region and the first end of the enlarged region.

First claim

What is claimed is:

1 . An apparatus, comprising:
a near-field transducer situated at or proximate an air bearing surface of the apparatus and configured to facilitate heat-assisted magnetic recording on a medium comprising:
an enlarged region comprising plasmonic material and having a first end proximate the air bearing surface and a second end opposing the first end;
a disk region adjacent the enlarged region and having a first end proximate the air bearing surface and a second end opposing the first end, the first end of the disk region comprising a projection terminating at or proximate the air bearing surface, the disk region comprising plasmonic material;
a peg region extending from the projection of the first end of the disk region and terminating at or proximate the air bearing surface; and
a region recessed with respect to the peg region, the recessed region located between the peg region and the first end of the enlarged region.

2 . The apparatus of claim 1 , wherein:
the recessed region comprises an end surface; and the first end of the enlarged region extends beyond the end surface of the recessed region.

3 . The apparatus of claim 1 , wherein:
the recessed region comprises an end surface; and the first end of the enlarged region is substantially coextensive with respect to the end surface of the recessed region.

4 . The apparatus of claim 1 , further comprising:
a middle disk region having a first end and an opposing second end, the middle disk region disposed between the disk region and the enlarged region, the second end of the middle disk region defining an end surface of the recessed region; wherein the second end of the middle disk region extends beyond the second end of the enlarged region.

5 . The apparatus of claim 4 , wherein the second end of the middle disk region extends about 50 to 150 nm beyond the second end of the enlarged region.

6 . The apparatus of claim 1 , wherein:
the enlarged region comprises a first planar surface and an opposing second planar surface oriented in a non-parallel relationship with respect to the first planar surface; and the first planar surface is adjacent the disk region.

7 . The apparatus of claim 1 , wherein the enlarged region has a generally elliptical shape with a major axis oriented toward the air bearing surface.

8 . The apparatus of claim 1 , wherein the recessed region is recessed between about 50 to 200 nm relative to the air bearing surface.

9 . The apparatus of claim 1 , wherein the peg region has a thickness between about 30 and 100 nm.

10 . The apparatus of claim 1 , wherein the recessed region facilitates an increase in thermal gradient at the peg region of between about 30% and 40% relative to the near-field transducer lacking the recessed region.

11 . The apparatus of claim 10 , wherein the increase in thermal gradient is achieved without an appreciable increase in peg region temperature.

12 . The apparatus of claim 1 , wherein the enlarged region is configured to serve as a heat sink of the near-field transducer.

13 . An apparatus, comprising:
a slider configured to facilitate heat-assisted magnetic recording on a medium comprising; a writer; a reader; an optical waveguide; and a near-field transducer proximate the waveguide and the writer, the near-field transducer comprising:
an enlarged region having a first end oriented in a medium-facing direction and an opposing second end, the enlarged region comprising plasmonic material;
a disk region adjacent the enlarged region and having a first end oriented in the medium-facing direction and an opposing second end, the first end of the disk region comprising a projection, the disk region comprising plasmonic material;
a peg region extending from the projection of the first end of the disk region and oriented in the medium-facing direction; and
a region recessed with respect to the peg region, the recessed region located between the peg region and the first end of the enlarged region.

14 . The apparatus of claim 13 , wherein:
the recessed region comprises an end surface; and the first end of the enlarged region extends beyond the end surface of the recessed region.

15 . The apparatus of claim 13 , wherein:
the recessed region comprises an end surface; and the first end of the enlarged region is substantially coextensive with respect to the end surface of the recessed region.

16 . The apparatus of claim 13 , further comprising:
a middle disk region having a first end and an opposing second end, the middle disk region disposed between the disk region and the enlarged region, the second end of the middle disk region comprising an end surface of the recessed region; wherein the second end of the middle disk region extends about 50 to 150 nm beyond the second end of the enlarged region.

17 . The apparatus of claim 13 , wherein the enlarged region has a generally elliptical shape with a major axis oriented in the medium-facing direction.

18 . The apparatus of claim 13 , wherein:
the slider comprises an air bearing surface; and the recessed region is recessed between about 50 to 200 nm relative to the air bearing surface.

19 . The apparatus of claim 13 , wherein the peg region has a thickness between about 30 and 100 nm.

20 . The apparatus of claim 13 , wherein the enlarged region is configured to serve as a heat sink of the near-field transducer.

21 . An apparatus, comprising:
a near-field transducer situated at or proximate an air bearing surface of the apparatus and configured to facilitate heat-assisted magnetic recording on a medium comprising:
an enlarged region comprising plasmonic material and having a first end proximate the air bearing surface;
a disk region adjacent the enlarged region and having a first end proximate the air bearing surface, the disk region comprising plasmonic material;
a peg region extending from the first end of the disk region and terminating at or proximate the air bearing surface; and
a region recessed with respect to the peg region, the recessed region located between the peg region and the first end of the enlarged region.

Assignees

• Seagate Technology Llc

Inventors

• Chen Weibin
• Scholz Werner

Classifications

• G11B2005/0021

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

• G11B5/012

  Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) · CPC title

• 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

• G11B5/3163

  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 title

• G11B5/6088

  Optical waveguide in or on flying head · CPC title