# US 9,437,228 B2 · Near field transducer for heat assisted magnetic recording

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- Number: US 9,437,228 B2
- Document ID: US9437228B2
- Status: Granted
- Kind: B2
- Application number: 14/666,237
- Filed: 2015-03-23
- Published: 2015-09-24
- Granted: 2016-09-06
- Earliest claimed: 2014-03-24
- Assignees: Purdue Research Foundation
- Applicants: Purdue Research Foundation
- Inventors: Xianfan Xu; Edward Kinzel
- Web page: https://patentgrep.com/patent/US9437228B2

## CPC

- G11B 5/4866: {the arm comprising an optical waveguide, e.g. for thermally-assisted recording}
- G11B 5/314: {where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence)}
- 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}
- G11B 5/6088: {Optical waveguide in or on flying head}
- G11B 2005/0021: {Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

An antenna for heat assisted magnetic recording is disclosed. The antenna includes an optically opaque material and an optically transparent material positioned on the optically opaque material, the optically transparent material includes a half bowtie shape which includes a first half-wing substantially shaped in form of a right angle trapezoid, having a height substantially equal to the overall height of the half bowtie, a second half-wing substantially shaped in form of a mirror image of the first half-wing and formed proximate and coupled to the first half-wing by a substantially rectangular aperture having an aperture width and an aperture height. The aperture height is as small as 1 nm.

## Claims

### Claim 1

An antenna for heat assisted magnetic recording, comprising:
an optically opaque material; and
an optically transparent material disposed on the optically opaque material, the optically transparent material including a half bowtie shape having
a first half-wing substantially shaped in form of trapezoid, having a height substantially equal to the overall height of the half bowtie;
a second half-wing substantially shaped in form of a mirror image of the first half-wing and formed proximate and coupled to the first half-wing by a substantially rectangular aperture having a tip width and an aperture gap,
the aperture gap as small as between 1 nm to 5 nm.

### Claim 2 (depends on 1)

The antenna for heat assisted magnetic recording of claim 1, the optically opaque material is metal.

### Claim 3 (depends on 1)

The antenna for heat assisted magnetic recording of claim 1, the optically transparent material is silicon dioxide, metal oxide, or combinations thereof.

### Claim 4 (depends on 1)

The antenna for heat assisted magnetic recording of claim 1, the optically opaque material and the optically transparent material form a vertical structure.