Metallic Layer Reflects Energy to Enhance Magnetic Recording Absorption
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Solution Overview
Problem
Current Near Field Transducer (NFT) designs in Energy Assisted Magnetic Recording (EAMR) technology have low delivery efficiency, leading to high power requirements and energy losses, which limit the scalability of data areal density and pose risks of overheating and functional failure due to inefficient energy absorption and heat management.
Innovation Solution
Incorporating a metallic layer between the recording layer and the substrate in the magnetic recording media, which reflects and enhances the absorption of electromagnetic energy through surface plasmon resonance, thereby increasing energy absorption at the recording layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional NFT designs are used, then the structure is simple, but the delivery efficiency is low (only a few percent)
Solution Approach 1:
The media stack is segmented into multiple functional layers: recording layer, metallic layer, and dielectric layer. Each layer serves a specific purpose in managing electromagnetic energy - the recording layer absorbs energy for heating, the metallic layer reflects energy back to enhance absorption, and the dielectric layer guides and confines the electromagnetic energy. This segmentation allows optimization of energy delivery efficiency while maintaining manageable structural complexity.
Solution Approach 2:
The metallic layer acts as an intermediary between the recording layer and the NFT. It reflects electromagnetic energy that passes through the recording layer back toward the recording region, thereby enhancing energy absorption without requiring direct modification of the NFT structure. This intermediary approach improves delivery efficiency while keeping the overall device complexity relatively low.
2Power
If higher power is used to compensate for low NFT efficiency, then enough energy can be delivered to heat the recording region, but heat dissipation and NFT overheating become problems
Solution Approach 1:
The metallic layer, which could potentially cause harmful heating if placed incorrectly, is strategically positioned to reflect electromagnetic energy back to the recording layer. This converts what would be wasted energy (harmful heat generation in the NFT) into beneficial energy that enhances heating of the recording region, thereby reducing the overall power requirement and NFT temperature.
Solution Approach 2:
The media stack structure creates localized energy concentration at the recording layer through the combination of dielectric confinement and metallic reflection. This ensures that electromagnetic energy is focused precisely where needed (the recording region) rather than being distributed throughout the entire media stack, improving heating efficiency and reducing unnecessary heat generation in other components.
3Use of energy by stationary object
If more energy is absorbed by the media, then the power requirement for the light source can be reduced, but the energy absorption must be maximized without causing other issues
Solution Approach 1:
The metallic layer continuously reflects electromagnetic energy back to the recording layer throughout the energy delivery process. This creates a continuous cycle of energy absorption and reflection that maximizes the useful action of the electromagnetic energy, ensuring that as much energy as possible is absorbed by the recording layer without being wasted, thereby reducing power requirements while maintaining NFT reliability.
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 significantly enhances energy absorption at the recording layer, reducing the power requirements for the light source, improving heat management, and increasing data areal density while minimizing the risk of NFT overheating and failure.
Implementation Method 1
The metallic layer can comprise a non-magnetic metal and be configured to reflect at least some of the second portion of the electromagnetic radiation towards the recording layer
Implementation Method 2
The recording layer can be configured to receive an electromagnetic radiation, absorb a first portion of the electromagnetic radiation
Implementation Method 3
The surface plasmon resonance excitation can cause an enhanced electromagnetic absorption at the recording region
Data Source
AI summary
A magnetic recording media is disclosed. The media comprises a substrate, a recording layer disposed over the substrate, and a metallic layer disposed between the recording layer and the substrate. The recording layer is configured to receive an electromagnetic radiation, absorb a first portion of the electromagnetic radiation, and transmit a second portion of the electromagnetic radiation. The metallic layer comprises a non-magnetic metal and configured to reflect at least some of the second portion of the electromagnetic radiation towards the recording layer.