Method for producing bi-polar complementary structure patterns

Patent metadata

Field	Value
Publication number	US-9230589-B2
Application number	US-201414199882-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 12, 2013
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

The embodiments disclose a method including creating at least one first structure including magnetically isolated features in servo fields, and creating at least one second structure including finger-structure patterns including intentional weak nucleation points in servo fields to create a regular bi-polar magnetization direction after bulk DC initialization, and wherein the first and second structures form bi-polar complementary structure patterns.

First claim

What is claimed is:

1. A method, comprising:
creating at least one first structure including magnetically isolated features in servo fields; and
creating at least one second structure including finger-structure patterns including intentional weak nucleation points in servo fields to create a regular bi-polar magnetization direction after bulk DC initialization, and wherein the first and second structures form bi-polar complementary structure patterns.

2. The method of claim 1 , further comprising radial direction chevron patterns and alternatively open chevron patterns e-beam etched into the magnetically isolated features including a width size equivalent to adjacent high density dot diameters.

3. The method of claim 1 , wherein the structures in servo fields form servo zone phase lock loop or position-error-signal fields to create bi-polar signals.

4. The method of claim 1 , wherein the magnetically isolated features include patterns with one or more extinguishable terminus.

5. The method of claim 1 , wherein the first structure is used for controlling deterministically magnetized servo-fields.

6. The method of claim 1 , wherein the first structure includes magnetically isolated feature structures including the radial direction chevron patterns and in another embodiment open chevron patterns in servo fields.

7. The method of claim 1 , wherein the second structure includes finger-structure patterns etched into servo fields including using an e-beam etch process wherein second structures include a width size equivalent to adjacent high density dot diameters.

8. The method of claim 1 , wherein the combined first and second structure creates servo zone phase lock loop position-error-signal fields.

9. The method of claim 1 , wherein the second structure includes finger-structure patterns wherein finger structures can span in a range from one e-beam field, approximately 10 micrometers (μm), to one logical radial zone, approximately 1 millimeter (mm).

10. The method of claim 1 , wherein the second structure includes polarity in the structure finger-structure patterns.

11. A structure, comprising:
at least one magnetically isolated feature in servo fields;
a polarity in the magnetically isolated feature; and
a servo structure including at least one polarity magnetically isolated feature configured to create servo zone phase lock loop and position-error-signal fields configured to create randomized bi-polar signals.

12. The structure of claim 11 , wherein the magnetically isolated feature includes a width size equivalent to adjacent high density dot diameters.

13. The structure of claim 11 , wherein the magnetically isolated features are configured to include nucleation spots in servo fields to form servo zone phase lock loop and position-error-signal fields to create bi-polar signals.

14. The first structure of claim 11 , wherein the structure is configured for use in controlling randomly magnetized servo-fields.

15. The first structure of claim 11 , wherein the magnetically isolated feature is configured to include radial direction chevron patterns and in another embodiment open chevron patterns including a nucleation spot and at least one extinguishable terminus.

16. A structure, comprising:
at least one structure configured to include at least one finger-structure pattern in servo fields;
a polarity in the finger-structure pattern of the structure; and
at least one intentional weak nucleation point in the finger-structure pattern configured to achieve a regular bi-polar magnetization direction after bulk DC initialization.

17. The structure of claim 16 , wherein the finger-structure can span in a range from one e-beam field, approximately 10 micrometers (μm), to one logical radial zone, approximately 1 millimeter (mm).

18. The structure of claim 16 , wherein the finger-structure pattern includes at least one extinguishable terminus.

19. The structure of claim 16 , wherein the structure is configured for use in controlling randomly magnetized servo-fields.

20. The structure of claim 16 , wherein the finger-structure pattern includes a width size equivalent to adjacent high density dot diameters.

Assignees

• Seagate Technology Llc

Inventors

• Steiner Philip
• Van De Veerdonk René J M

Classifications

• G11B5/59688

  Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns · CPC title

• G11B5/743

  Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks · CPC title

• H01F7/02

  Permanent magnets {[PM]} · CPC title

• G11B5/59655

  Sector, sample or burst servo format · CPC title

• H01F41/0253

  for manufacturing permanent magnets · CPC title