Heat assisted magnetic recording heads having bilayer heat sinks

Patent metadata

Field	Value
Publication number	US-9305575-B2
Application number	US-201414556472-A
Country	US
Kind code	B2
Filing date	Dec 1, 2014
Priority date	Apr 25, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

Disclosed herein is an apparatus that includes a near field transducer positioned adjacent to an air bearing surface of the apparatus; a first magnetic pole; and a heat sink positioned between the first magnetic pole and the near field transducer, wherein the heat sink includes a first and second portion, with the first portion being adjacent the near field transducer and the second portion being adjacent the first magnetic pole, the first portion including a plasmonic material, and the second portion including a diffusion blocking material.

First claim

What is claimed is:

1. An apparatus comprising:
a near field transducer positioned adjacent to an air bearing surface of the apparatus;
a first magnetic pole; and
a heat sink positioned between the first magnetic pole and the near field transducer,
wherein the heat sink comprises a first and second portion,
with the first portion being adjacent the near field transducer and the second portion being adjacent the first magnetic pole, the first portion comprising a plasmonic material, and
the second portion comprising NiP.

2. The apparatus according to claim 1 , wherein the first portion has a thickness from about 15 nm to 100 nm.

3. The apparatus according to claim 1 , wherein the first portion has a thickness from about 30 nm to about 70 nm.

4. The apparatus according to claim 1 , wherein the first portion comprises Au, Ag, Al, Cu, alloys thereof, or combinations thereof.

5. The apparatus according to claim 1 , wherein the first portion comprises Au, Ag, Cu, Al, or combinations thereof.

6. The apparatus according to claim 1 , wherein the near field transducer comprises a peg and disc.

7. The apparatus according to claim 6 , wherein the first portion of the heat sink is adjacent the disc of the near field transducer.

8. The apparatus according to claim 7 , wherein the thickness of the disc is about 25 nm.

9. The apparatus according to claim 1 , wherein the apparatus has a NFT-Pole space that is defined by the distance between the near field transducer and the write pole at the air bearing surface of the apparatus.

10. The apparatus according to claim 9 , wherein the NFT-Pole space is not greater than about 50 nm.

11. An apparatus comprising:
a light source;
a waveguide;
a near field transducer positioned adjacent to an air bearing surface of the apparatus;
a first magnetic pole; and
a heat sink positioned between the first magnetic pole and the near field transducer,
wherein the heat sink comprises a first and second portion,
with the first portion being adjacent the near field transducer and the second portion being adjacent the first magnetic pole, the first portion comprising a plasmonic material, and
the second portion comprising NiP,

wherein the light source, waveguide and near field transducer are configured to transmit light from the light source to the waveguide and finally the near field transducer.

12. The apparatus according to claim 11 , wherein the first portion of the heat sink has a thickness from about 30 nm to about 70 nm.

13. The apparatus according to claim 11 , wherein the first portion of the heat sink comprises Au, Ag, Cu, Al, or combinations thereof.

14. A disc drive comprising:
at least one actuator arm having a first and a second end;
at least one head, wherein each arm has a head at the first end thereof and wherein each head comprises:
a near field transducer positioned adjacent to an air bearing surface of the apparatus;

a first magnetic pole; and
a heat sink positioned between the first magnetic pole and the near field transducer,
wherein the heat sink comprises a first and second portion,
with the first portion being adjacent the near field transducer and the second portion being adjacent the first magnetic pole, the first portion comprising a plasmonic material, and

the second portion comprising NiP,

wherein the light source and the near field transducer are configured to transmit light from the light source to the near field transducer in order to assist the magnetic writer with writing.

15. The disc drive according to claim 14 , wherein the first portion of the heat sink has a thickness from about 30 nm to about 70 nm and comprises Au, Ag, Cu, Al, or combinations thereof.

Assignees

• Seagate Technology Llc

Inventors

• Zhao Tong
• Tabakovic Ibro
• Kautzky Michael C
• Venkatasamy Venkatram
• Gong Jie

Classifications

• G11B13/04

  magnetically {or by magnetisation} and optically {or by radiation, for changing or sensing optical properties} · 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

• 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