Multi-Layer Recording Lamination for HAMR Servo Track Writing
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Solution Overview
Problem
Heat-assisted magnetic recording (HAMR) media with increased magnetic coercivity interferes with servo data recording, limiting data storage media production and accessibility, as existing technologies struggle to efficiently format and program servo data tracks with near field transducers (NFTs) and solid immersion mirrors (SIMs).
Innovation Solution
A multi-layer recording lamination with a predetermined coercivity is configured to record servo format marks on multiple data tracks using a solid immersion mirror and program data bits with a near field transducer, allowing for optimized data storage media production and accessibility by tuning the structural and material characteristics of the tuning layer to accommodate both SIM and NFT operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat-assisted magnetic recording (HAMR) media with increased magnetic coercivity is used, then data storage capacity and durability are improved, but servo data recording becomes difficult and manufacturing efficiency deteriorates
Solution Approach 1:
The patent divides the recording process into two distinct stages: a manufacturing stage using solid immersion mirror (SIM) to write servo format marks, and an operational stage using near field transducer (NFT) for data programming. This segmentation allows each process to be optimized independently - SIM for high-coercivity media formatting during manufacturing, and NFT for data storage operations, thereby resolving the contradiction between durability and manufacturing efficiency.
Solution Approach 2:
The patent introduces a specialized multi-layer recording lamination structure as an intermediary between the SIM and NFT processes. This lamination includes specific layers (such as a first recording layer and second recording layer with different coercivities) that facilitate both SIM-based servo mark writing and NFT-based data programming, enabling the system to achieve both high durability and manufacturing efficiency.
2Reliability
If increased magnetic coercivity is applied to HAMR media, then data retention is improved, but compatibility with existing servo formatting processes deteriorates
Solution Approach 1:
The patent applies local quality by creating different recording layers with different magnetic coercivity characteristics. The first recording layer has higher coercivity for data retention, while the second recording layer has lower coercivity that is more compatible with SIM formatting processes. This local differentiation allows the media to simultaneously achieve high data retention and compatibility with existing servo formatting processes.
Solution Approach 2:
The patent uses a composite multi-layer recording lamination structure combining materials with different magnetic properties. The composite structure includes a first recording layer with high coercivity for data retention and a second recording layer with lower coercivity for SIM compatibility, enabling the media to satisfy both data retention requirements and formatting process compatibility.
3Ease of manufacture
If conventional single-layer recording structure is used, then manufacturing simplicity is maintained, but data storage capacity and accessibility are limited
Solution Approach 1:
The patent transitions from a conventional single-layer recording structure to a multi-layer recording lamination, adding the dimension of vertical layering. This dimensional change enables multiple recording layers with different coercivity characteristics, thereby increasing data storage capacity and accessibility while maintaining manufacturing simplicity through a systematic layer-by-layer construction approach.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient manufacturing of data storage media with wide servo format marks spanning multiple data tracks, enhancing data accessibility and compatibility, while maintaining compatibility with HAMR operations and reducing manufacturing time through precise tuning of the SIM and NFT operations.
Implementation Method 1
record at least one servo format mark for a plurality of data tracks with a solid immersion mirror
Implementation Method 2
program a data bit on the multi-layer recording lamination with a near field transducer
Implementation Method 3
Heat-assisted magnetic recording (HAMR) media with increased magnetic coercivity interferes with servo data recording
Data Source
AI summary
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.