Orientation Initialization Layer for Low-Temperature L10 Media
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Solution Overview
Problem
High ordering temperatures required for L10-structured perpendicular magnetic recording media are costly and limit compatibility with certain substrates, such as aluminum, making it difficult to achieve high magnetic anisotropy and thermal stability at lower manufacturing costs.
Innovation Solution
Incorporating a magnetic recording layer with an orientation initialization layer (OIL) and intermediate layers, such as a heatsink layer and non-magnetic interlayer, to lower the ordering temperature of L10-structured recording layers, enabling their use on various substrates like aluminum while maintaining high magnetic anisotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional high-temperature processing is used to achieve L10 ordering in the magnetic recording layer, then high magnetic anisotropy and thermal stability are obtained, but manufacturing costs increase and compatibility with aluminum substrates is lost
Solution Approach 1:
An orientation initialization layer (OIL) is introduced as an intermediary between the magnetic recording layer and the soft magnetic underlayer. This OIL layer facilitates L10 ordering at lower temperatures by providing a template for crystalline orientation, thereby reducing manufacturing costs and enabling aluminum substrate compatibility while maintaining thermal stability
Solution Approach 2:
The processing temperature parameter is changed from conventional high temperatures to lower temperatures through the introduction of the OIL layer. This parameter change enables L10 ordering to occur at reduced temperatures, lowering manufacturing costs and expanding substrate compatibility options
2Reliability
If conventional high-temperature processing is used to achieve L10 ordering in the magnetic recording layer, then high magnetic anisotropy is obtained, but manufacturing cost increases
Solution Approach 1:
The OIL layer acts as a mediator that enables L10 ordering at lower temperatures by providing crystallographic template and orientation guidance, thus achieving high magnetic anisotropy without the need for expensive high-temperature processing
Solution Approach 2:
The OIL layer performs preliminary action by establishing the desired crystalline orientation and structure before the magnetic recording layer is fully formed. This preliminary structuring enables subsequent low-temperature processing to achieve the same L10 ordering that would otherwise require high temperatures
3Reliability
If conventional high-temperature processing is used for L10 ordering, then thermal stability is improved, but compatibility with aluminum substrates is lost
Solution Approach 1:
The OIL layer serves as a buffer and intermediary between the magnetic recording layer and the aluminum substrate, enabling low-temperature processing that is compatible with aluminum substrates while still achieving the L10 ordering necessary for thermal stability
Solution Approach 2:
By changing the processing temperature parameter to lower values through the OIL-mediated process, the system becomes compatible with aluminum substrates that cannot withstand high temperatures, while maintaining the thermal stability required for high-density storage
4Ease of manufacture
If lower ordering temperature is achieved through OIL and intermediate layers, then manufacturing cost is reduced and substrate compatibility is improved, but additional layers are added to the structure
Solution Approach 1:
The OIL layer and intermediate layers serve multiple functions simultaneously: they provide crystallographic templating for L10 ordering, act as diffusion barriers, provide mechanical support, and enable low-temperature processing. This multi-functionality justifies the additional layers by consolidating multiple requirements into a single integrated structure
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 reduces manufacturing costs and allows for higher magnetic anisotropy at lower temperatures, enabling the use of L10-structured media on non-glass substrates and improving coercivity and noise reduction in magnetic recording.
Implementation Method 1
Incorporating a magnetic recording layer with an orientation initialization layer (OIL) and intermediate layers, such as a heatsink layer and non-magnetic interlayer, to lower the ordering temperature of L10-structured recording layers
Implementation Method 2
Incorporating a magnetic recording layer with an orientation initialization layer (OIL) and intermediate layers, such as a heatsink layer and non-magnetic interlayer, to lower the ordering temperature of L10-structured recording layers
Implementation Method 3
A higher magnetic anisotropy constant (Ku) is typically required to resist the demagnetization effects of the perpendicular geometry and to keep the smaller grains thermally stable
Data Source
AI summary
A recording medium comprising a magnetic recording layer having an axis of magnetic anisotropy substantially perpendicular to the surface thereof, a soft magnetic underlayer disposed under the magnetic recording layer and physically coupled to the magnetic recording layer through one or more intermediate layers magnetically decoupling the soft magnetic underlayer from the magnetic recording layer, and an orientation initialization layer disposed between the magnetic recording layer and the soft magnetic underlayer.