Magnetoresistive Bridge Layout for a Wider Linear Sensing Range
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Solution Overview
Problem
Existing push-pull linear tunneling magnetoresistive sensors have a narrow linear range, limiting their effectiveness in magnetic field detection.
Innovation Solution
A magnetoresistive sensor with harmonically broadened linear range is achieved by using multiple push-pull magnetoresistive sensing bridge arms with varying key characteristic parameters, connected in series, parallel, or hybrid series-parallel configurations, to superimpose linear and nonlinear harmonic parts of resistance versus magnetic field characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If standard push-pull linear tunneling magnetoresistive sensing units with fixed key characteristic parameters are used, then the sensor structure is simple and easy to manufacture, but the linear range is narrow
Solution Approach 1:
The sensor is divided into multiple push-pull magnetoresistive sensing bridge arms, each containing N types of magnetoresistive sensing units with different key characteristic parameters. This segmentation allows each arm to contribute differently to the overall linear range, resolving the contradiction between simplicity and extended linear range.
Solution Approach 2:
The patent changes the key characteristic parameters (zero magnetic field resistance R0i, magnetoresistance change rate MRi, free layer saturation magnetic field Hsi, direction angle ±αpi) of the magnetoresistive sensing units across different bridge arms. By varying these parameters, the sensor achieves harmonically broadened linear range while maintaining a systematic structure.
2Adaptability or versatility
If multiple magnetoresistive sensing units with different key characteristic parameters are arranged in series-parallel configurations, then the linear range is expanded, but the device complexity increases
Solution Approach 1:
The patent designs a universal connection framework where N types of magnetoresistive sensing units can be arranged in series, parallel, or hybrid series-parallel configurations. This multi-functional connection approach allows the same basic unit to serve multiple purposes in different bridge arms, expanding linear range without proportionally increasing complexity.
Solution Approach 2:
The sensor employs a composite structure combining multiple magnetoresistive sensing units with different characteristic parameters in series-parallel configurations. This composite approach creates a harmonically broadened linear range by superimposing the R-H characteristic curves of individual units, achieving enhanced adaptability while managing complexity through systematic integration.
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 linear range of the magnetoresistive sensor is significantly expanded, providing improved sensitivity and detection capabilities across a broader magnetic field range compared to standard sensors.
Implementation Method 1
A magnetoresistive sensing unit includes a free layer, a pinned layer, and an intermediate insulating layer... the relationship between the resistance R of the push-pull linear tunneling magnetoresistive sensor and an external magnetic field H
Data Source
AI summary
A magnetoresistive sensor with harmonically broadened linear range comprises a substrate (100) and a multiple push-pull magnetoresistive sensing bridge arms. The push arms (91) of the sensing bridge comprise N types of push magnetoresistive sensing units (94). The pull arms (92) comprise N types of pull magnetoresistive sensing units. Key characteristic parameters of each magnetoresistive sensing unit comprise R0i, MRi, Hsi, ±αpi and ai. The Key characteristic parameters of the push magnetoresistive sensing units (94) and corresponding pull magnetoresistive sensing units are different from the key characteristic parameters of standard magnetoresistive sensing unit of a standard push-pull linear magnetoresistive sensor. There is at least one set of key characteristic parameters [(R0j, MRj, Hsj, ±αpj), aj]. Linear parts and nonlinear harmonic parts of R-H characteristic parameters that characterize the push magnetoresistive sensing units and the pull magnetoresistive sensing units are superimposed, so that the linear range of the multiple push-push magnetoresistive sensing bridge is greater than the linear range of the standard push-pull linear magnetoresistive sensor.