Multi-layer recording lamination for solid immersion mirror servo track writing

Patent metadata

Field	Value
Publication number	US-8982678-B2
Application number	US-201213442483-A
Country	US
Kind code	B2
Filing date	Apr 9, 2012
Priority date	Apr 9, 2012
Publication date	Mar 17, 2015
Grant date	Mar 17, 2015

Abstract

A data storage media may have at least a multi-layer recording lamination with a predetermined coercivity. The multi-layer recording lamination can be configured to record at least one servo format mark for a plurality of data tracks with a solid immersion mirror and program a data bit on the multi-layer recording lamination with a near field transducer.

First claim

What is claimed is:

1. A data storage device comprising:
a multi-layer heat assisted magnetic recording (HAMR) lamination with a predetermined coercivity provided by a recording layer disposed between a protective layer and a magnetic tuning layer, the tuning layer having a predetermined thickness allowing at least one magnetic servo format mark spanning a plurality of data tracks to be recorded with a solid immersion mirror (SIM) without a near field transducer (NFT) and program a user data bit to a single data track of the multi-layer recording lamination with a NFT, the at least one servo format mark being smaller in size than a servo track and positioning the servo track in a predetermined pattern.

2. The data storage media of claim 1 , wherein the predetermined coercivity is tuned to provide data programming with a laser positioned on a heat assisted magnetic recording (HAMR) head.

3. The data storage media of claim 2 , wherein the SIM condenses the laser radiation to a predetermined spot size.

4. The data storage media of claim 3 , wherein the predetermined spot size is approximately 150 nm.

5. The data storage media of claim 1 , wherein at least the predetermined thickness corresponds to the predetermined coercivity.

6. The data storage media of claim 1 , wherein each of the plurality of data tracks are approximately 50-60 nm wide.

7. The data storage media of claim 1 , wherein each servo format mark continuously spans to the plurality of data tracks.

8. The data storage media of claim 1 , wherein the SIM has a predetermined curvature corresponding to the plurality of data tracks.

9. The data storage media of claim 1 , wherein the plurality of data tracks comprise 2-3 different data tracks.

10. The data storage media of claim 1 , wherein the tuning layer is configured to provide multiple different a predetermined thermal profiles through the multi-layer recording lamination.

11. The data storage media of claim 10 , wherein the NFT is used without the SIM to program the user data bit.

12. A method comprising:
equipping a multi-layer heat assisted magnetic recording (HAMR) lamination with a predetermined coercivity by positioning a recording layer between a protective layer and a magnetic tuning layer; and
configuring the tuning layer with a predetermined thickness to allow at least one servo format mark to be recorded for a plurality of data tracks with a first solid immersion mirror (SIM) without a near field transducer (NFT); and
programming a user data bit to a single data track of the multi-layer recording lamination the NFT, the at least one servo format mark being smaller in size than a servo track and positioning the servo track in a predetermined pattern.

13. The method of claim 12 , wherein the first SIM programs is the at least one servo format mark on the plurality of data tracks and a second SIM is used concurrently with the NFT to program the user data bit.

14. The method of claim 12 , wherein the NFT programs to a single data track at a time.

15. The method of claim 12 , wherein a servo-format writing algorithm is used to configure the at least one servo format mark as part of a multi-disk servo writing system.

16. The method of claim 12 , wherein the at least one servo format mark is used to write a non-user defined servo track in the predetermined pattern.

17. The method of claim 12 , wherein the SIM records the at least one servo format mark with reduced sensitivity to a head-disk spacing compared to the NFT.

18. A method comprising:
equipping a first heat assisted magnetic recording (HAMR) head with a first solid immersion mirror (SIM) and without a near field transducer (NFT);
equipping a second HAMR head with a second SIM and a NFT; and
configuring a multi-layer heat assisted magnetic recording (HAMR) lamination with a predetermined coercivity by positioning a recording layer between a protective layer and a magnetic tuning layer, the tuning layer having a predetermined thickness providing multiple different thermal profiled through the multi-layer recording lamination to allow at least one servo format mark to be recorded for a plurality of data tracks with the first HAMR head and a user data bit to be programmed to a single data track of the multi-layer recording lamination with the second SIM and NFT of the second HAMR head, the at least one servo format mark being smaller in size than a servo track and positioning the servo track in a predetermined pattern.

19. The method of claim 18 , wherein the first HAMR head is configured to condense laser radiation with the first SIM to a predetermined width sufficient to write the at least one servo format mark.

20. The method of claim 18 , wherein the first HAMR head is utilized during a manufacturing process and the second HAMR head is utilized subsequent to the manufacturing process.

Assignees

• Gage Edward Charles
• Thiele Jan-Ulrich
• Seagate Technology Llc

Inventors

• Gage Edward Charles
• Thiele Jan-Ulrich

Classifications

• G11B5/59638 Primary

  Servo formatting apparatuses, e.g. servo-writers · CPC title

• G11B5/59661

  Spiral servo format · 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

• G11B5/59655

  Sector, sample or burst servo format · CPC title

• G11B5/59666

  Self servo writing · CPC title