Transparent Smear on Near-Field Transducer for Heat Management
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Solution Overview
Problem
The challenge in magnetic recording technology is the reduction of recording density due to the narrowing of write tracks, which leads to overheating and reduced reliability of magnetic media drives, particularly with heat-assisted magnetic recording (HAMR) systems where optically absorbing material accumulates on the near-field transducer (NFT), increasing its temperature and reducing device lifetime.
Innovation Solution
A transparent smear is intentionally formed on the magnetic recording head using materials from the magnetic media, allowing for pretreatment without data writing, which prevents overheating and can be retreated if necessary, while removing optically absorbing smears and replacing them with non-absorbing ones to maintain effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat-assisted magnetic recording (HAMR) is used to achieve higher recording densities, then recording density is improved, but optically absorbing material accumulates on the NFT causing overheating and reduced reliability
Solution Approach 1:
The patent applies preliminary action by performing a pretreatment process before normal recording operations to deposit an optically transparent smear layer on the NFT. This preventive measure is taken in advance to avoid the accumulation of optically absorbing material that would otherwise occur during normal HAMR operations, thereby preventing overheating and extending device lifetime while maintaining high recording density capabilities
Solution Approach 2:
The patent converts the harmful accumulation of optically absorbing material into a beneficial transparent smear layer. By intentionally depositing a controlled layer of transparent material during pretreatment, the system transforms what would be a harmful overheating issue into a protective measure that actually improves heat management and extends NFT lifetime while maintaining the high-temperature HAMR recording process
2Productivity
If the NFT temperature is increased to improve recording density, then recording performance is improved, but the lifetime of the magnetic media drive is reduced
Solution Approach 1:
The patent applies preliminary action by performing a pretreatment process before normal recording operations to deposit an optically transparent smear layer on the NFT. This preventive measure is taken in advance to avoid the accumulation of optically absorbing material that would otherwise occur during normal HAMR operations, thereby preventing overheating and extending device lifetime while maintaining high recording density capabilities
Solution Approach 2:
The patent changes the optical parameters of the NFT surface by depositing a transparent smear layer with different optical properties. This parameter change affects the NFT's interaction with laser light, reducing optical absorption and heat generation during HAMR operations, thereby allowing the system to maintain recording density performance while reducing thermal stress and extending drive lifetime
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 approach extends the lifetime of magnetic media drives by maintaining optimal NFT temperatures and preventing the accumulation of optically absorbing material, ensuring consistent performance and reducing the risk of overheating.
Implementation Method 1
In HAMR, a laser source is located next to or near the write element in order to produce heat
Implementation Method 2
a laser source exciting a near-field transducer (NFT) to produce heat at a write location of a magnetic recording medium
Implementation Method 3
An optically transparent smear is intentionally formed on the magnetic recording head to ensure the magnetic recording head does not overheat
Data Source
AI summary
The present disclosure relates to pretreating a magnetic recording head to increase the lifetime of the magnetic media drive. A transparent smear is purposefully formed on the magnetic recording head to ensure the magnetic recording head does not overheat and lead to a short drive lifetime. The transparent smear is formed from material found in the magnetic media. The transparent smear is formed by pretreating the magnetic recording head with the transparent material from the magnetic media. The pretreating occurs without writing any data to the magnetic media. Once the transparent smear is in place, writing may occur. The magnetic recording head can be retreated at a later time should the transparent smear degrade. Furthermore, if an optically absorbing smear develop, it can be removed and a new transparent smear may be formed.