Heat assisted magnetic recording (HAMR) media with thermal exchange control layer of lower curie temperature

Patent metadata

Field	Value
Publication number	US-9984709-B1
Application number	US-201715466798-A
Country	US
Kind code	B1
Filing date	Mar 22, 2017
Priority date	Mar 22, 2017
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

An apparatus is disclosed. The apparatus includes a storage layer, a thermal exchange control layer disposed over the storage layer, and a write layer disposed over the thermal exchange control layer. A Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the storage layer. The Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the write layer.

First claim

What is claimed is:

1. An apparatus comprising:
a storage layer;
a thermal exchange control layer disposed over the storage layer; and
a write layer disposed over the thermal exchange control layer, wherein a Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the storage layer, and wherein the Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the write layer, wherein the write layer has a higher saturation magnetization in comparison to the storage layer.

2. The apparatus of claim 1 , wherein a material of the storage layer includes FePt.

3. The apparatus of claim 1 , wherein a material of the write layer is selected from a group consisting of CoPt, FeCoPt, CoCrPt, FePd, CoPd, FeCoPd, CoCrPd, FeCo, and Co.

4. The apparatus of claim 1 , wherein a material of the thermal exchange control layer includes FePtX, wherein X is selected from a group consisting of Cu, Ru, Rh, Nd, Mn, and Ag, wherein X reduces the Curie temperature of the thermal exchange control layer to below the Curie temperature of the storage layer and the write layer.

5. The apparatus of claim 1 , wherein the thermal exchange control layer comprises magnetic material.

6. The apparatus of claim 1 , wherein the Curie temperature of the storage layer is lower than the Curie temperature of the write layer.

7. The apparatus of claim 1 , wherein the thermal exchange control layer comprises a plurality of thermal exchange control layers, wherein a Curie temperature of at least two thermal exchange control layers of the plurality of thermal exchange control layers differ from one another.

8. The apparatus of claim 1 , wherein the thermal exchange control layer partially turns the vertical exchange coupling between the write layer and the storage layer on and off during write process and cooling, wherein the partial turn on and off by the thermal exchange control layer suppresses noise.

9. The apparatus of claim 1 , wherein coercivity of the apparatus is reduced in presence of the thermal exchange control layer in comparison to an apparatus without the thermal exchange control layer.

10. The apparatus of claim 1 , wherein a thickness of the storage layer ranges from 2 to 15 nm.

11. The apparatus of claim 1 , wherein a thickness of the write layer ranges from 0.2 to 3 nm.

12. The apparatus of claim 1 , wherein a thickness of the thermal exchange control layer ranges from 0.1 to 2 nm.

13. The apparatus of claim 1 , wherein a writing temperature of the apparatus is reduced in presence of the thermal exchange control layer in comparison to an apparatus without the thermal exchange control layer.

14. A method comprising:
at least partially demagnetizing a storage layer, a thermal exchange control layer, and a write layer of a heat assisted magnetic recording (HAMR) media responsive to application of heat to a Curie temperature of the storage layer, wherein the Curie temperature of the storage layer is lower than a Curie temperature of the write layer and wherein the Curie temperature of the write layer is greater than a Curie temperature of the thermal exchange control layer, and wherein the thermal exchange control layer is deposited between the write layer and the storage layer;
turning exchange coupling between the write layer and the storage layer at least partially off responsive to application of heat to the Curie temperature of the write layer;
magnetizing the storage layer, the thermal exchange control layer, and the write layer once the Curie temperature of the write layer is reached;
maintaining magnetization within the storage layer, the thermal exchange control layer, and the write layer as the HAMR media is cooled from the Curie temperature of the write layer to the Curie temperature of the thermal exchange control layer; and
turning exchange coupling between the write layer and the storage layer at least partially on responsive to the HAMR media cooling from the Curie temperature of the write layer to the Curie temperature of the thermal exchange control layer.

Assignees

• Seagate Technology Llc

Inventors

• Huang Pin-Wei
• Ding Yinfeng
• Peng Yingguo
• Zhu Xiaobin
• Chang Kai-Chieh
• Kubota Yukiko
• Klemmer Timothy J
• Wu Qihong
• Ju Ganping
• Thiele Jan-Ulrich
• Zavaliche Florin

Classifications

• G11B5/653

  containing Fe or Ni (containing Co G11B5/656; containing inorganic, non-oxide compounds of Si, N, P, B, H or C G11B5/657; containing oxygen G11B5/658) · CPC title

• G11B7/126

  Circuits, methods or arrangements for laser control or stabilisation · CPC title

• G11B5/656

  containing Co (containing inorganic, non-oxide compounds of Si, N, P, B, H or C G11B5/657; containing oxygen G11B5/658) · 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

• G11B5/6088

  Optical waveguide in or on flying head · CPC title