Reduced spacing recording apparatus

Patent metadata

Field	Value
Publication number	US-9299379-B2
Application number	US-201414161607-A
Country	US
Kind code	B2
Filing date	Jan 22, 2014
Priority date	Nov 26, 2008
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

Aspects include recording media with enhanced areal density through reduction of head media spacing, head keeper spacing, or head to soft underlayer spacing. Such aspects comprise replacing currently non-magnetic components of devices, such as interlayers and overcoats with components and compositions comprising magnetic materials. Other aspects relate to magnetic seed layers deposited within a recording medium. Preferably, these aspects, embodied as methods, systems and/or components thereof reduce effective magnetic spacing without sacrificing physical spacing.

First claim

The invention claimed is:

1. An apparatus comprising:
a soft magnetic underlayer (SUL) on a substrate;
a magnetic recording layer over the SUL;
a ferromagnetic media overcoat on top of the magnetic recording layer; and
a ferromagnetic interlayer between the SUL and the magnetic recording layer, wherein the ferromagnetic interlayer has a saturation magnetization (Ms) of about 100-1000 emu/cc.

2. The apparatus of claim 1 , wherein the ferromagnetic media overcoat is configured to function with a ferromagnetic head overcoat disposed over a surface of a magnetic writer.

3. The apparatus of claim 1 , wherein the ferromagnetic interlayer comprises:
a first granular layer comprising RuCo and having a thickness of about 1-200 angstroms over the SUL;
a second granular layer comprising Ru and having a thickness of about 0.1-100 angstroms over the first granular layer comprising RuCo; and
a third granular layer comprising RuCo and having a thickness of about 1-200 angstroms over the second granular layer comprising Ru, wherein the second granular layer comprising Ru is anti-ferromagnetically coupled to the first and third granular layers comprising RuCo.

4. The apparatus of claim 1 , wherein the ferromagnetic interlayer has a thickness of about 1-1000 angstroms.

5. The apparatus of claim 1 , wherein the ferromagnetic interlayer is granular and comprises ruthenium (Ru), iron (Fe), cobalt (Co), nickel (Ni), carbon (C), or a crystalline magnetic material.

6. The apparatus of claim 1 , wherein the ferromagnetic media overcoat has saturation magnetization (Ms) of about 100-1000 emu/cc and a thickness of about 0.1-100 angstroms.

7. The apparatus of claim 1 , wherein:
the ferromagnetic interlayer comprises a first granular layer comprising Ru positioned between second and third granular layers comprising RuCo,
the first granular layer is anti-ferromagnetically coupled to the second and third granular layers,
each of the second and third granular layers has a respective thickness of about 1-200 angstroms and a saturation magnetization (Ms) of about 100-1000 emu/cc, and
the first granular layer has a thickness of between about 0.1-100 angstroms.

8. The apparatus of claim 1 , wherein the ferromagnetic media overcoat comprises Fe, Co, Ni, C, Ni—Fe—C, or Ni—Co—C.

9. An apparatus comprising:
a soft magnetic underlayer (SUL) on a substrate;
a magnetic recording layer over the SUL;
a ferromagnetic media overcoat on top of the magnetic recording layer, wherein the ferromagnetic media overcoat has a saturation magnetization (Ms) of about 100-1000 emu/cc; and
a paramagnetic interlayer between the SUL and the magnetic recording layer.

10. The apparatus of claim 9 , wherein the paramagnetic interlayer comprises:
a first granular layer comprising RuCo and having a thickness of about 1-200 angstroms over the SUL;
a second granular layer comprising Ru and having a thickness of about 0.1-100 angstroms over the first granular layer comprising RuCo; and
a third granular layer comprising RuCo and having a thickness of about 1-200 angstroms over the second granular layer comprising Ru, wherein the second granular layer comprising Ru is anti-ferromagnetically coupled to the first and third granular layers comprising RuCo.

11. The apparatus of claim 9 , wherein the paramagnetic interlayer has a saturation magnetization (Ms) of about 100-1000 emu/cc and a thickness of about 1-1000 angstroms.

12. The apparatus of claim 9 , wherein the paramagnetic interlayer is granular and comprises ruthenium (Ru), iron (Fe), cobalt (Co), nickel (Ni), carbon (C), or a crystalline magnetic material.

13. The apparatus of claim 9 , wherein the ferromagnetic media overcoat has a thickness of about 0.1-100 angstroms.

14. The apparatus of claim 9 , wherein:
the paramagnetic interlayer comprises a first granular layer comprising Ru positioned between second and third granular layers comprising RuCo,
the first granular layer is anti-ferromagnetically coupled to the second and third granular layers,
each of the second and third granular layers has a respective thickness of about 1-200 angstroms and a saturation magnetization (Ms) of about 100-1000 emu/cc, and
the first granular layer has a thickness of between about 0.1-100 angstroms.

15. An apparatus comprising:
a magnetic recording layer over a soft magnetic underlayer (SUL); and
a paramagnetic interlayer between the SUL and the magnetic recording layer, wherein the paramagnetic interlayer has a saturation magnetization (Ms) of about 100-1000 emu/cc.

16. The apparatus of claim 15 further comprising a ferromagnetic media overcoat on top of the magnetic recording layer.

17. The apparatus of claim 15 , wherein the paramagnetic interlayer comprises:
a first layer comprising Ru;
a second layer comprising RuCo; and
a third layer comprising RuCo.

18. The apparatus of claim 17 , wherein:
the first layer has a thickness of about 0-200 angstroms over the second layer;
the second layer has a thickness of about 0.1-100 angstroms over the SUL; and
the third layer having a thickness of about 1-200 angstroms over the first layer, wherein the second layer is anti-ferromagnetically coupled to the first and third layers.

19. The apparatus of claim 15 , wherein the paramagnetic interlayer has a thickness of about 1-1000 angstroms.

20. The apparatus of claim 15 , wherein the paramagnetic interlayer is granular and comprises ruthenium (Ru), iron (Fe), cobalt (Co), nickel (Ni), carbon (C), or a crystalline magnetic material.

21. An apparatus comprising:
a soft magnetic underlayer (SUL) on a substrate;
a magnetic recording layer over the SUL;
a ferromagnetic media overcoat on top of the magnetic recording layer, wherein the ferromagnetic media overcoat has saturation magnetization (Ms) of about 100-1000 emu/cc; and
a ferromagnetic interlayer between the SUL and the magnetic recording layer.

Assignees

• Seagate Technology Llc

Inventors

• Gao Kaizhong
• Lu Bin
• Valcu Bogdan Florin
• Ma Xiaoding

Classifications

• G11B5/66

  the record carriers consisting of several layers · CPC title

• G11B5/72 Primary

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

• Y10T428/1164

  with protective film · CPC title

• G11B5/667

  including a soft magnetic layer · CPC title

• G11B5/672

  having different compositions in a plurality of magnetic layers, e.g. layer compositions having differing elemental components or differing proportions of elements · CPC title