Magnetic Sensing Layer Patterning via Insulating Mask
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Solution Overview
Problem
Ion beam etching is a cumbersome process in semiconductor manufacturing for patterning magnetic sensing layers, particularly when forming complex structures like magnetoresistance elements, as it requires multiple steps and can be inefficient.
Innovation Solution
A method involving the use of insulating layers as both masking and final product layers, where a first insulating layer is deposited over a protective layer on a substrate, openings are formed, a magnetic sensing layer is deposited, and a second insulating layer is applied and removed using chemical mechanical polishing, potentially eliminating the need for ion beam etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ion beam etching is used to pattern magnetic sensing layers, then the magnetic sensing layers can be formed with precise patterns, but the fabrication process becomes cumbersome and inefficient due to multiple steps
Solution Approach 1:
The patent combines multiple functions into the insulating layers: they serve as both the patterning mask and the final insulating structure in the magnetoresistive device. This eliminates the need for separate mask layers and reduces the number of fabrication steps while maintaining precise patterning through the insulating layer's structural integrity during ion beam etching
Solution Approach 2:
The insulating layers perform multiple roles: they act as the patterning mask during fabrication, serve as the final insulating structure in the device, and provide structural support for the magnetic sensing layer. This multi-functionality reduces process complexity while maintaining patterning precision
2Manufacturing precision
If ion beam etching is used for patterning, then precise patterns can be achieved, but the process requires multiple steps and takes more time
Solution Approach 1:
The patent merges the mask layer and final insulating layer into a single insulating layer structure, eliminating the need for separate mask deposition and removal steps. This reduces fabrication time while maintaining precise patterning through the insulating layer's controlled etching characteristics
Solution Approach 2:
The insulating layers are deposited and patterned beforehand to serve as the final structure, eliminating the need for subsequent mask removal and clean-up steps. This preliminary action reduces overall fabrication time while ensuring precise patterning is achieved during the etching process
3Ease of manufacture
If traditional patterning methods are used, then the process is well-established, but it requires removing resist layers and using separate mask layers which increases complexity
Solution Approach 1:
The patent combines the mask layer and final insulating layer into a single insulating layer, eliminating the need for separate resist and mask layers. This simplifies the manufacturing process while reducing the total number of layers in the final device structure
Solution Approach 2:
The insulating layer serves dual purposes as both the patterning mask and the final insulating structure, eliminating the need for separate mask layers and simplifying the overall device architecture while maintaining ease of manufacture
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 simplifies the semiconductor fabrication process by reducing the number of steps and enhancing the precision of patterning magnetic sensing layers, such as GMR, TMR, and AMR elements, while allowing the insulating layers to function within the final semiconductor structure.
Implementation Method 1
Ion beam etching (IBE) is used in many semiconductor manufacturing processes. Ion beam etching can be used to remove resist layers formed on a semiconductor material. The impact of the ions erodes areas not covered by the mask layer to provide a desired semiconductor structure.
Implementation Method 2
the second insulating layer and any portions of the magnetic sensing layer are removed from the first insulation layer using a chemical mechanical polish (CMP) technique
Data Source
AI summary
The present disclosure is directed towards a method for patterning a magnetic sensing layer. The method includes disposing a protective layer on a first of a substrate, disposing a first insulating layer on a first surface of protective layer. An opening is formed in the first insulating layer to expose the first surface of the protective layer. A magnetic sensing layer is disposed over the first insulating layer and a predetermined portion of the first surface of the protective layer within the opening. A second insulating layer can be disposed over the magnetic sensing layer. The second insulation layer and the magnetic sensing layer can be removed from the first insulation layer. Thus, the opening includes the magnetic sensing layer and the second insulation layer after the removal of the second insulation layer and magnetic sensing layer from the first insulation layer.