Magnetoresistive Sensor Z-Axis Measurement
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Solution Overview
Problem
Conventional three-dimensional magnetoresistive sensing devices have complex structures and high fabrication costs due to the need for separate chips to measure magnetic fields in orthogonal axes, which complicates production and reduces yield.
Innovation Solution
A magnetoresistive sensing device with a magnetic layer forming a non-straight angle with the substrate reference plane, allowing for integrated measurement of Z-axis magnetic fields without additional flux concentrators, enabling a simplified and cost-effective semiconductor fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional separate chips are used to measure magnetic fields in orthogonal axes, then measurement capability is achieved, but device complexity and fabrication cost increase
Solution Approach 1:
The patent combines multiple magnetoresistive sensing elements oriented in different directions (X, Y, and Z axes) onto a single substrate, eliminating the need for separate chips. The sensing elements are integrated in a planar arrangement where each element measures magnetic field components along different axes, achieving three-dimensional measurement capability while reducing device complexity.
Solution Approach 2:
The patent transforms the three-dimensional magnetic field measurement problem into a two-dimensional planar sensing array. By arranging magnetoresistive sensing elements in specific orientations on a flat substrate, the system can measure magnetic field components in three spatial dimensions without requiring vertical stacking or out-of-plane structures.
2Ease of manufacture
If package assembling approach is used to mount chips orthogonally, then Z-axis measurement is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent integrates all sensing elements for X, Y, and Z-axis measurement onto a single substrate using standard semiconductor fabrication processes, eliminating the need for separate chip assembly. All magnetoresistive sensing elements are patterned and connected in a single manufacturing step, simplifying both fabrication and assembly.
Solution Approach 2:
The patent replaces mechanical assembly operations (chip mounting, orthogonal positioning, bonding) with semiconductor fabrication processes (photolithography, thin-film deposition, patterning). This substitution eliminates complex mechanical assembly steps and enables high-volume automated manufacturing.
3Productivity
If vertical assembling of chips is performed, then three-dimensional sensing is achieved, but production yield decreases
Solution Approach 1:
The patent consolidates multiple sensing functions into a single monolithic device fabricated on one substrate, eliminating the need for vertical chip stacking. This integration ensures that all sensing elements are produced in the same fabrication batch under identical conditions, maximizing production yield while maintaining full three-dimensional measurement capability.
Solution Approach 2:
The patent uses identical magnetoresistive sensing element designs for all three spatial dimensions, copying the same structural pattern and material composition across different orientations. This standardization simplifies fabrication and ensures consistent performance across all sensing axes without requiring complex assembly variations.
4Device complexity
If flux concentrators are added to measure Z-axis magnetic field, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces magnetic flux concentrators (passive magnetic guiding structures) with magnetoresistive sensing elements that directly detect magnetic field components. The sensing elements use electrical resistance changes in response to magnetic field orientation, eliminating the need for physical flux concentration pathways and simplifying the overall device structure.
Solution Approach 2:
The patent changes the measurement parameter from magnetic flux density (requiring flux concentrators) to electrical resistance (measured directly by magnetoresistive elements). This parameter change enables direct measurement of magnetic field orientation without requiring magnetic flux guidance structures, simplifying the device design.
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 solution allows for a simplified structure and cost-effective production of three-dimensional magnetoresistive sensing devices on a single semiconductor chip, improving production yield and integrating Z-axis measurement with X-Y axis sensing capabilities.
Implementation Method 1
magnetoresistive sensing device
Data Source
AI summary
A magnetoresistive sensing device includes a substrate, a magnetic layer, a first electrode and a second electrode. The substrate has a reference plane. The first electrode and a second electrode are disposed over the reference plane. The magnetic layer is disposed over the reference plane and has a magnetization direction. A non-straight angle is formed between the magnetic layer and the reference plane. The first electrode and the second electrode are electrically connected with each other through an electric pathway of the magnetic layer. An included angle is formed between the electric pathway and the magnetization direction. Consequently, the magnetoresistive sensing device is capable of measuring a magnetic field change in a Z-axis direction, which is perpendicular to a reference plane.