Magnetoresistive Apparatus Laser Magnetization Structuring
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Solution Overview
Problem
Magnetoresistive apparatuses with small structure dimensions face challenges in achieving sufficient magnetization due to deflection of laser beams, resulting in low signal levels, especially when trying to create different reference magnetizations in various regions on a substrate, which is not possible with conventional homogeneous magnetization methods.
Innovation Solution
A method involving the formation of large structures on a substrate to define regions with the same magnetization, followed by laser magnetization to achieve high magnetization, and subsequent structuring to create smaller magnetoresistive elements with independent magnetizations, allowing for high signal capabilities even in small dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser magnetization is used on small structures, then localized magnetization is achieved, but magnetization strength decreases due to beam deflection
Solution Approach 1:
The patent applies preliminary action by performing laser magnetization on large structures before structuring them into smaller elements. This sequence ensures that the magnetization process occurs when the structure is still large enough to maintain beam stability and achieve strong magnetization, while the subsequent structuring step creates the desired small dimensions for the final device.
2Reliability
If homogeneous furnace magnetization is used, then complete magnetization is achieved, but different reference magnetizations in different regions are not possible
Solution Approach 1:
The patent applies segmentation by dividing the substrate into distinct regions separated by trenches before performing laser magnetization. This allows different regions to receive different magnetization treatments (different directions, strengths, or timing) while maintaining complete magnetization in each region. The trenches act as physical barriers that enable independent control of magnetization parameters in each segmented region.
3Length of moving object
If structure dimensions are reduced, then device miniaturization is achieved, but signal levels decrease due to lower magnetization
Solution Approach 1:
The patent performs magnetization before the final structuring step that creates small dimensions. By magnetizing the larger structures first, the laser beam can effectively penetrate and magnetize the entire structure without deflection issues. After magnetization, the structures are then processed into smaller dimensions, preserving the strong magnetization that was established when the structures were larger.
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 enables the production of magnetoresistive apparatuses with high magnetization and independent magnetizations in various regions, leading to improved signal levels and effective operation in sensors like angle and speed sensors.
Implementation Method 1
a region to be magnetized is then heated by means of a laser beam
Implementation Method 2
Magnetoresistive apparatuses use magnetoresistive effects, in which a resistance changes depending on a magnetic field
Data Source
AI summary
Methods and apparatuses for producing magnetoresistive apparatuses are provided. Here, structures are formed for defining regions of the same magnetization, magnets are magnetized, and structures are formed within the magnets of the regions, for example, in order to define magnetoresistive elements.