Magnetic Sensor Third Shield Z-Axis Flux Convergence
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Solution Overview
Problem
Magnetic sensors face a decrease in magnetic field detection range when strong Z-axis magnetic fields are applied, as the free layer magnetization rotates, reducing the sensor's output and limiting its detection capabilities.
Innovation Solution
The magnetic sensor design incorporates a third magnetic shield that converges magnetic flux in the Z-direction, reducing the magnetic field strength applied to the detector and maintaining a wide detection range, along with a magnetic field converter to convert Z-axis fields into XY-plane fields for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strong Z-axis magnetic field is applied to the magnetic sensor, then the magnetic field strength to be detected increases, but the free layer magnetization rotates in the Z direction causing output drop and decreasing the detection range
Solution Approach 1:
A third magnetic shield is introduced as an intermediary component between the Z-axis magnetic field source and the magnetic detection element. This shield converges the Z-axis magnetic flux, reducing the magnetic field strength that reaches the detection element and preventing free layer magnetization rotation, thereby maintaining detection range even in strong magnetic field environments
Solution Approach 2:
The magnetic shielding function is segmented into multiple components: first and second magnetic shields for XY-plane field shielding, and a third magnetic shield specifically for Z-axis field convergence. This segmentation allows each shield to be optimized for its specific directional function, with the third shield dedicated to managing Z-axis flux without interfering with XY-plane detection capabilities
2Object-affected harmful factors
If magnetic shields are added to shield external magnetic fields, then shielding effectiveness improves, but device complexity increases
Solution Approach 1:
The third magnetic shield serves multiple functions simultaneously: it converges Z-axis magnetic flux to reduce field strength at the detection element, maintains detection range, and works cooperatively with the first and second shields to provide comprehensive magnetic field management. This multi-functionality reduces the need for additional separate components
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 configuration effectively suppresses the output drop caused by strong Z-axis magnetic fields, enhancing the magnetic field detection range and maintaining sensitivity across the XY plane, even under strong magnetic field conditions.
Implementation Method 1
a third magnetic shield that converges magnetic flux in the Z-direction, reducing the magnetic field strength applied to the detector
Implementation Method 2
a magnetic field converter to convert Z-axis fields into XY-plane fields for detection
Implementation Method 3
a magnetoresistive device (a GMR element, a TMR element, or the like) in which resistance changes according to changes in an external magnetic field
Data Source
AI summary
The present disclosure provides a magnetic sensor including: a magnetic field detector that includes a magnetic detection element; a first magnetic shield and a second magnetic shield that are disposed so as to sandwich the magnetic field detector therebetween in a first direction; and a third magnetic shield that is disposed on a side of the magnetic field detector in a second direction that is orthogonal to the first direction.