Multilayer structures for magnetic recording devices to facilitate targeted magnetic switching and low coercivity

Patent metadata

Field	Value
Publication number	US-11990163-B2
Application number	US-202217854617-A
Country	US
Kind code	B2
Filing date	Jun 30, 2022
Priority date	Jun 30, 2022
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

Aspects of the present disclosure generally relate to magnetic recording heads (such as write heads of data storage devices) that include multilayer structures to facilitate targeted switching and relatively low coercivity. In one or more embodiments, a magnetic recording head includes an iron-cobalt (FeCo) layer having a crystalline structure that is a cubic lattice structure, a first crystalline layer formed of a first material, and a second crystalline layer between the first crystalline layer and the FeCo layer. The second crystalline layer is formed of a second material different from the first material, and the second crystalline layer interfaces both the FeCo layer and the first crystalline layer. The crystalline structure of the FeCo layer has a texture of <100>.

First claim

What is claimed is:

1. A magnetic recording head, comprising:
an iron-cobalt (FeCo) layer having a crystalline structure that is a cubic lattice structure;
a first crystalline layer formed of a first material;
a second crystalline layer between the first crystalline layer and the FeCo layer, the second crystalline layer formed of a second material different from the first material, and the second crystalline layer interfacing both the FeCo layer and the first crystalline layer; and
an amorphous seed layer, wherein the first crystalline layer is between the amorphous seed layer and the second crystalline layer.

2. The magnetic recording head of claim 1 , wherein the crystalline structure of the FeCo layer is body-centered cubic (BCC) and has a texture of <100>.

3. The magnetic recording head of claim 2 , wherein the FeCo layer comprises a plurality of grains having a mean grain size of 18 nm or higher.

4. The magnetic recording head of claim 2 , wherein the second crystalline layer has a surface energy that is 2.25 J/m2 or higher.

5. The magnetic recording head of claim 2 , wherein the second crystalline layer includes chromium (Cr) at a Cr atomic percentage that is 85% or greater.

6. The magnetic recording head of claim 5 , wherein the second crystalline layer has a crystalline structure that is body-centered cubic (BCC) and has a texture of <100>.

7. The magnetic recording head of claim 1 , wherein the first crystalline layer is formed of an alloy including one or more ruthenium (Ru), aluminum (Al), chromium (Cr), or molybdenum (Mo).

8. The magnetic recording head of claim 7 , wherein the alloy is a ruthenium aluminide (RuAl) alloy having an Ru atomic percentage within a range of 48% to 58% and an Al atomic percentage within a range of 42% to 52%.

9. The magnetic recording head of claim 7 , wherein the alloy is a chromium-molybdenum (CrMo) alloy having an Mo atomic percentage within a range of 25% to 60% and a Cr atomic percentage within a range of 40% to 75%.

10. The magnetic recording head of claim 7 , wherein the first crystalline layer has a crystalline structure that is ordered BCC (B2) and has a texture of <100>.

11. The magnetic recording head of claim 1 , wherein the amorphous seed layer is metallic or ionic.

12. The magnetic recording head of claim 11 , wherein the amorphous seed layer is formed of a metallic material that includes one or more of nickel (Ni), zirconium (Zr), tantalum (Ta), niobium (Nb), or iron (Fe).

13. The magnetic recording head of claim 11 , wherein the amorphous seed layer is formed of an ionic material that includes one or more of (Al), oxygen (O), or silicon (Si).

14. A magnetic recording device comprising the magnetic recording head of claim 1 .

15. A magnetic recording head, comprising:
an iron-cobalt (FeCo) layer having a crystalline structure that is a cubic lattice structure;
a first crystalline layer formed of a first material;
a second crystalline layer between the first crystalline layer and the FeCo layer, the second crystalline layer formed of a second material different from the first material, and the second crystalline layer interfacing both the FeCo layer and the first crystalline layer; and
a main pole and a hot seed layer, wherein:
the hot seed layer comprises the iron-cobalt (FeCo) layer; and
one or more of the first crystalline layer and the second crystalline layer is in a gap between the hot seed layer and the main pole.

16. The magnetic recording head of claim 15 , wherein the main pole comprises one or more shields, wherein at least one of the one or more shields comprises the FeCo layer.

17. The magnetic recording head of claim 15 , wherein the main pole comprises one or more shields, wherein at least one of the one or more shields is a trailing shield that comprises the FeCo layer.

18. The magnetic recording head of claim 15 , wherein the first crystalline layer is formed of an alloy including one or more of ruthenium (Ru), aluminum (Al), chromium (Cr), or molybdenum (Mo).

19. A magnetic recording device comprising the magnetic recording head of claim 15 .

20. A magnetic recording head, comprising:
an iron-cobalt (FeCo) layer having a crystalline structure that is a cubic lattice structure;
a first crystalline layer formed of a first material;
a second crystalline layer between the first crystalline layer and the FeCo layer, the second crystalline layer formed of a second material different from the first material, and the second crystalline layer interfacing both the FeCo layer and the first crystalline layer; and
a main pole and one or more shields for the main pole, wherein at least one of the one or more shields comprises the iron-cobalt (FeCo) layer.

21. The magnetic recording head of claim 20 , wherein the at least one of one or more shields is a trailing shield that comprises the iron-cobalt (FeCo) layer.

22. The magnetic recording head of claim 20 , wherein the crystalline structure of the FeCo layer is body-centered cubic (BCC) and has a texture of <100>.

23. The magnetic recording head of claim 20 , wherein the second crystalline layer includes chromium (Cr) at a Cr atomic percentage that is 85% or greater.

24. The magnetic recording head of claim 20 , further comprising an amorphous seed layer, wherein the first crystalline layer is disposed between the amorphous seed layer and the second crystalline layer.

25. The magnetic recording head of claim 24 , wherein the amorphous seed layer is metallic or ionic.

26. The magnetic recording head of claim 25 , wherein the amorphous seed layer is formed of a metallic material that includes one or more of nickel (Ni), zirconium (Zr), tantalum (Ta), niobium (Nb), or iron (Fe).

27. The magnetic recording head of claim 25 , wherein the amorphous seed layer is formed of an ionic material that includes one or more of (Al), oxygen (O), or silicon (Si).

28. A magnetic recording device comprising the magnetic recording head of claim 20 .

Assignees

• Western Digital Tech Inc

Inventors

• Shi Ning
• York Brian R
• Okamura Susumu
• Song Suping

Classifications

• G11B5/3929 Primary

  Disposition of magnetic thin films not used for directly coupling magnetic flux from the track to the MR film or for shielding · CPC title

• G11B5/3912 Primary

  Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields (G11B5/3916 takes precedence) · CPC title

• G11B5/1278

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title