Magnetic stack including cooling element

Patent metadata

Field	Value
Publication number	US-9607634-B2
Application number	US-201615045563-A
Country	US
Kind code	B2
Filing date	Feb 17, 2016
Priority date	Jun 30, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

Various embodiments of a magnetic stack are disclosed. In one or more embodiments, the magnetic stack includes first and second shield layers, and a magnetically responsive lamination disposed between the first and second shield layers. The magnetically responsive lamination can be configured to receive a sense current I S therethrough. The magnetic stack also includes a cooling element disposed between the first and second shield layers and thermally coupled to the magnetically responsive lamination. The cooling element can be configured to receive a bias current I B therethrough. And the cooling element can be configured to cool the magnetically responsive lamination during a read function.

First claim

What is claimed is:

1. A magnetic stack, comprising:
first and second shield layers;
a magnetically responsive lamination disposed between the first and second shield layers and configured to receive a sense current I S therethrough;
an array of cooling elements thermally coupled to the magnetically responsive lamination, wherein the array of cooling elements is configured to receive a bias current I B therethrough, and further wherein the array of cooling elements is configured to cool the magnetically responsive lamination; and
a first current source electrically coupled to the magnetically responsive lamination to provide I S and a second current source electrically coupled to the array of cooling elements to provide I B .

2. The magnetic stack of claim 1 , wherein each cooling element of the array of cooling elements is independently controllable.

3. The magnetic stack of claim 1 , wherein the array of cooling elements is in contact with the magnetically responsive lamination.

4. The magnetic stack of claim 1 , wherein the array of cooling elements is thermally coupled to the second shield layer.

5. The magnetic stack of claim 1 , further comprising insulating material disposed between the array of cooling elements and an air bearing surface (ABS) of the magnetic stack.

6. The magnetic stack of claim 1 , wherein the array of cooling elements comprises a Peltier cooling element.

7. The magnetic stack of claim 1 , wherein each cooling element of the array of cooling elements comprises a semiconductor material.

8. The magnetic stack of claim 1 , wherein the array of cooling elements is disposed between the magnetically responsive lamination and the second shield layer.

9. The magnetic stack of claim 1 , further comprising a controller operable to control I B .

10. The magnetic stack of claim 1 , further comprising a third shield layer disposed such that the array of cooling elements is between the third shield layer and the second shield layer, wherein the third shield layer is magnetically coupled to the second shield layer and electrically coupled to the array of cooling elements.

11. The magnetic stack of claim 1 , wherein the magnetically responsive lamination comprises a ferromagnetic free layer, a synthetic antiferromagnetic (SAF) structure, and a spacer layer positioned between the ferromagnetic free layer and the SAF structure.

12. The magnetic stack of claim 1 , further comprising an antiferromagnetic (AFM) structure disposed between the first shield layer and the magnetically responsive lamination and magnetically coupled to the magnetically responsive lamination.

13. A data storage device comprising the magnetic stack of claim 1 .

14. A magnetic stack, comprising:
first and second shield layers;
a magnetically responsive lamination disposed between the first and second shield layers and configured to receive a sense current I S therethrough;
a cooling element disposed between the first and second shield layers and thermally coupled to the magnetically responsive lamination, wherein the cooling element is configured to receive a bias current I B therethrough, and further wherein the cooling element is configured to cool the magnetically responsive lamination during a read function;
a third shield layer disposed such that the cooling element is between the third shield layer and the second shield layer, wherein the third shield layer is magnetically coupled to the second shield layer and electrically coupled to the cooling element; and
a first current source electrically coupled to the magnetically responsive lamination to provide I S and a second current source electrically coupled to the cooling element to provide I B .

15. The magnetic stack of claim 14 , wherein the cooling element comprises a Peltier cooling element.

16. The magnetic stack of claim 14 , further comprising insulating material disposed between the cooling element and an air bearing surface (ABS) of the magnetic stack.

17. A magnetic stack, comprising:
first and second shield layers;
a magnetically responsive lamination disposed between the first and second shield layers and configured to receive a sense current I S therethrough; and
an array of cooling elements thermally coupled to the magnetically responsive lamination, wherein the array of cooling elements is configured to receive a bias current I B therethrough, wherein the array of cooling elements is configured to cool the magnetically responsive lamination, and further wherein each cooling element of the array of cooling elements is independently controllable.

Assignees

• Seagate Technology Llc

Inventors

• Deen David
• Singleton Eric
• Ramaswamy Vasudevan
• Patwari Mohammed
• Pokhil Taras
• Li Jae-Young

Classifications

• G11B5/115

  Shielding devices arranged between heads or windings ({G11B5/265} , G11B5/29 take precedence) · CPC title

• G11B5/607

  using thermal means · CPC title

• G11B5/315

  Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads · CPC title

• G11B33/144 Primary

  by detection, control, regulation of the temperature · CPC title

• G11B5/09

  Digital recording · CPC title