Apparatuses and methods for absorbing optical energy

Patent metadata

Field	Value
Publication number	US-9734856-B2
Application number	US-201615199668-A
Country	US
Kind code	B2
Filing date	Jun 30, 2016
Priority date	Jul 23, 2015
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Provided herein is an apparatus including a substrate and a magnetic recording layer over the substrate. In addition, a thermochromic layer is over the substrate, wherein the thermochromic layer includes a first optical absorbance at a first temperature and a second optical absorbance at a second temperature.

First claim

What is claimed is:

1. An apparatus comprising:
a substrate;
a magnetic recording layer over the substrate;
a thermochromic layer over the magnetic recording layer, wherein
the thermochromic layer includes a first optical absorbance at a first temperature and a second optical absorbance at a second temperature,
the second optical absorbance is higher than the first optical absorbance, and
the second temperature is higher than the first temperature; and

an additional thermochromic layer over the substrate, wherein the additional thermochromic layer includes a third optical absorbance at a third temperature and a fourth optical absorbance at a fourth temperature.

2. The apparatus of claim 1 , further comprising a protective layer over the thermochromic layer, wherein the protective layer includes diamond-like carbon.

3. The apparatus of claim 1 , further comprising a heat sink layer under the magnetic recording layer.

4. The apparatus of claim 1 , further comprising:
a protective layer under the thermochromic layer; and
a lubricant layer over the thermochromic layer.

5. The apparatus of claim 1 , wherein the thermochromic layer is about 1 nm to about 25 nm thick.

6. The apparatus of claim 1 , wherein the thermochromic layer includes VO 2 ; Ag/O 2 ; Ge 20 Te 80 ; Ti 2 O 3 ; NbO 2 ; V 2 O 5 ; SmNiO 3 ; EuNiO 3 ; GdNiO 3 ; or YiNiO 3 .

7. The apparatus of claim 1 , wherein a transition temperature of the thermochromic layer for switching from the first optical absorbance to the second optical absorbance is less than about 300° C.

8. The apparatus of claim 1 , wherein a transition temperature of the thermochromic layer for switching from the first optical absorbance to the second optical absorbance is greater than about 60° C.

9. An apparatus comprising:
a substrate;
a magnetic recording layer over the substrate;
a thermochromic layer over the substrate, wherein the thermochromic layer includes a first optical absorbance at a first temperature and a second optical absorbance at a second temperature; and
an additional thermochromic layer over the substrate, wherein the additional thermochromic layer includes a third optical absorbance at a third temperature and a fourth optical absorbance at a fourth temperature.

10. The apparatus of claim 9 , further comprising a protective layer over the thermochromic layer.

11. The apparatus of claim 9 , further comprising a heat sink layer over the substrate.

12. The apparatus of claim 9 , wherein the magnetic recording layer comprises the thermochromic layer and a plurality of magnetic grains separated by the thermochromic layer.

13. The apparatus of claim 9 , wherein the thermochromic layer includes VO 2 ; Ag/O 2 ; Ge 20 Te 80 ; Ti 2 O 3 ; NbO 2 ; V 2 O 5 ; SmNiO 3 ; EuNiO 3 ; GdNiO 3 ; or YiNiO 3 .

14. The apparatus of claim 9 , wherein a transition temperature of the thermochromic layer for switching between the first optical absorbance and the second optical absorbance is 60° C. to 300° C.

15. An apparatus comprising:
a heat sink layer;
a magnetic recording layer over the heat sink layer;
a thermochromic layer over the heat sink layer, wherein the thermochromic layer includes a first optical absorbance at a first temperature and a second optical absorbance at a second temperature; and
an additional thermochromic layer over the heat sink laver, wherein the additional thermochromic layer includes a third optical absorbance at a third temperature and a fourth optical absorbance at a fourth temperature.

16. The apparatus of claim 15 , wherein the second optical absorbance is higher than the first optical absorbance.

17. The apparatus of claim 15 , wherein the second temperature is higher than the first temperature.

18. The apparatus of claim 15 , wherein the magnetic recording layer and the thermochromic layer are in a same horizontal plane.

19. The apparatus of claim 15 , wherein the first temperature is 15° C. to 22° C.

Assignees

• Seagate Technology Llc

Inventors

• Jones Paul M
• Klemmer Timothy J
• Yang Ruoxi
• Blaber Martin Giles
• Ma Xiaoding
• Fan Zhaohui Z
• Stirniman Michael J
• Yang Yang
• Yan Xiaoping
• Huang Fujian
• Esmenda Emil John C
• Kazazic Emir R
• Zavaliche Florin
• Wang Hongbo
• Tang Huan H
• Damavandi Kyoumarss

Classifications

• G11B5/012

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

• G11B5/72 Primary

  Protective coatings, e.g. anti-static {or antifriction} · CPC title

• G11B5/7264 Primary

  Inorganic carbon protective coating, e.g. graphite, diamond like carbon or doped carbon · CPC title