Non-Magnetic Seed Layer for HAMR Media Epitaxial Growth
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Solution Overview
Problem
Growing granular magnetic media for heat-assisted magnetic recording (HAMR) in hard disk drives requires complex processing conditions to meet structural, morphological, magnetic, and thermal requirements, making it challenging to achieve optimal magnetization and demagnetization of magnetic media.
Innovation Solution
A magnetic stack structure is introduced, featuring a non-magnetic seed layer less than 5 Å thick, which promotes epitaxial growth and controls wetting conditions for the magnetic recording layers, comprising a substrate, soft magnetic underlayer, heat sink layer, interlayer, and magnetic recording structure, optimized with specific materials and deposition techniques to enhance data storage capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex processing conditions are used to grow granular magnetic media for HAMR, then structural, morphological, magnetic, and thermal requirements are met, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the underlayer structure into distinct functional layers: a soft magnetic underlayer and a non-magnetic seed layer. This segmentation allows each layer to be optimized independently for its specific function, simplifying the overall processing by breaking down the complex requirement into manageable, specialized components.
Solution Approach 2:
The non-magnetic seed layer is deposited in advance to prepare the surface for magnetic recording layer growth. This preliminary action establishes the desired crystal orientation and surface morphology before the magnetic layers are deposited, ensuring optimal growth conditions without requiring complex in-situ adjustments during magnetic layer deposition.
2Manufacturing precision
If a non-magnetic seed layer is used to promote epitaxial growth, then magnetic recording layer growth and wetting conditions are improved, but the layer structure becomes more complex
Solution Approach 1:
The non-magnetic seed layer acts as an intermediary between the soft magnetic underlayer and the magnetic recording layers. It mediates the interface by providing a controlled surface that promotes epitaxial growth and optimal wetting, while its non-magnetic nature prevents interference with the magnetic properties of the recording layers.
Solution Approach 2:
The seed layer provides localized quality enhancement at the interface region where epitaxial growth occurs. By concentrating the functional properties (crystal orientation control, wetting enhancement) specifically at this critical interface, the rest of the structure can remain simpler without compromising overall performance.
3Productivity
If the seed layer thickness is reduced to less than or equal to 5 Å, then epitaxial growth promotion is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a precise thickness parameter for the seed layer (≤5 Å) to optimize its function. This thinness parameter allows the seed layer to effectively promote epitaxial growth and control wetting without creating excessive interface complexity or magnetic interference, representing an optimized parameter balance.
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
The proposed magnetic stack structure improves the growth and properties of magnetic recording layers, enabling efficient data storage and thermal management, thereby addressing the complexity of HAMR media growth and enhancing the performance of hard disk drives.
Implementation Method 1
The non-magnetic seed layer may promote epitaxial growth of the subsequently deposited magnetic recording layers
Implementation Method 2
The SUL may include multiple layers, which may be laminated structures and/or antiferromagnetically coupled layers
Implementation Method 3
Heating the magnetic media reduces the coercivity of the magnetic media, which enables a write head to change the magnetization direction
Data Source
AI summary
A magnetic stack includes a substrate and a soft magnetic underlayer deposited on a top surface of the substrate. A heat sink layer is disposed on top of the soft magnetic underlayer, and an interlayer is deposited on top of the heat sink layer. A non-magnetic seed layer is deposited on top of the interlayer. A magnetic recording structure which includes more than one magnetic recording layer is deposited on the top surface of the non-magnetic seed layer.