Magnetic Shielding Layer Adhesion for MRAM Data Loss Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic semiconductor memories, such as field switching MRAM or STT-MRAM devices, require effective shielding against external magnetic fields to prevent data loss, but existing solutions are complex and costly.
Innovation Solution
A method involving the adherence of magnetic shielding layers to the substrate surfaces, with specific adherence properties to ensure effective shielding while allowing for easy removal of film layers over bond-pads and scribe lines, and the use of soft-magnetic materials like Fe and Ni alloys, integrated into the manufacturing process to reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic shielding layers are applied to protect semiconductor devices from external magnetic fields, then data loss prevention is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The magnetic shielding layer application is merged with the existing film layer deposition process. The same deposition equipment and process steps are used to apply both the magnetic shielding layer and the functional film layers, eliminating the need for separate shielding layer deposition equipment and reducing manufacturing complexity
Solution Approach 2:
The deposition process is designed to serve multiple functions: it creates both the magnetic shielding layers and the functional film layers (such as barrier layers or seed layers) that are required for device fabrication. This multi-functionality reduces the total number of process steps and equipment requirements
2Reliability
If magnetic shielding layers are applied to protect semiconductor devices, then data loss prevention is improved, but manufacturing cost increases
Solution Approach 1:
The magnetic shielding layer deposition is combined with existing film layer deposition processes, allowing both layers to be formed in the same equipment using the same material sources and process parameters, thereby eliminating additional equipment costs and reducing per-unit manufacturing costs
Solution Approach 2:
The magnetic shielding layers are formed using the same deposition process that creates the functional film layers, meaning the process serves itself by producing both protective and functional layers without requiring separate dedicated processes, thus reducing overall manufacturing cost
3Ease of operation
If film layers are made less adherent to magnetic shielding layers, then ease of removal over bond-pads and scribe lines is improved, but shielding effectiveness may be compromised
Solution Approach 1:
The adhesion characteristics are made spatially variable: the film layers have reduced adhesion to the magnetic shielding layers specifically at locations corresponding to bond-pads and scribe lines (where removal is desired), while maintaining strong adhesion in other areas. This is achieved through localized process control during deposition or subsequent selective treatment
Solution Approach 2:
The deposition process is designed with preliminary considerations for future removal needs. By controlling the adhesion properties during the initial deposition stage, the process pre-establishes the conditions that will later allow easy removal of film layers from specific areas without compromising the magnetic shielding function in retained areas
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 provides a cost-effective and efficient magnetic shielding solution that effectively protects semiconductor devices from external magnetic fields, reducing data loss and simplifying the manufacturing process.
Implementation Method 1
Magnetic semiconductor memories such as field switching MRAM or STT-MRAM devices often need an effective shielding to prevent data loss due to external magnetic fields
Implementation Method 2
a first adhesive layer is provided between the magnetic shielding layer and the substrate, the adhesive layer being more adherent to the magnetic shielding layer than the film layer to the magnetic shielding layer
Data Source
AI summary
A method for applying a magnetic shielding layer to a substrate is provided, wherein a first magnetic shielding layer is adhered to a first surface of the substrate. A first film layer is adhered to the first magnetic shielding layer and the first magnetic shielding layer is more adherent to the first surface than the film layer to the first magnetic shielding layer.