Magnetoresistive Sensor Shielding Element Vortex Magnetization
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Solution Overview
Problem
Magnetoresistive sensors face limitations in achieving a wide linear working range due to technical constraints on the dimensions of the free layer, leading to increased production costs and risks of delamination with thicker shielding layers.
Innovation Solution
A magnetoresistive sensor with a shielding element featuring vortex magnetization, which generates a linear magnetic stray field counter to external magnetic fields, allowing for effective shielding with thinner layers and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thicker shielding layers are used to achieve effective shielding, then shielding performance is improved, but production costs increase and delamination risk increases
Solution Approach 1:
The patent changes the magnetization state parameter of the shielding layer from conventional uniform magnetization to vortex magnetization. This parameter change enables the shielding layer to generate a counter-directed stray field that compensates for external magnetic fields, achieving effective shielding with thinner layers and reducing delamination risk.
Solution Approach 2:
The patent introduces a stray field generated by the vortex magnetization in the shielding layer as an intermediary mechanism. This stray field acts as a mediator that counteracts external magnetic fields, providing shielding functionality without requiring thick shielding layers.
2Measurement precision
If the dimensions of the free layer are adjusted to achieve a wide linear working range, then measurement range is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the magnetization configuration parameter from conventional uniform magnetization to vortex magnetization in the shielding layer. This parameter change creates a self-compensating mechanism through stray field generation, enabling a wide linear working range without requiring precise control of free layer dimensions.
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 vortex magnetization enables a wider linear working range and reduced production costs by allowing thinner shielding elements, while maintaining effective shielding performance.
Implementation Method 1
the shielding element has a vortex magnetization with a closed flux in a layer plane
Implementation Method 2
the shielding element is configured, in a presence of the external magnetic field, to generate a linear magnetic stray field in the layer plane that is directed counter to the external magnetic field
Implementation Method 3
the electrical resistance or conductance thereof changes when the sensor is exposed to a magnetic field
Implementation Method 4
A magnetic tunnel resistance is based on a magnetoresistive effect that occurs in magnetic tunnel contacts
Implementation Method 5
A layer consisting of an antiferromagnet is arranged adjacent to one of the two ferromagnetic layers. The antiferromagnetic layer is used to fix the magnetization direction of the directly adjacent ferromagnetic layer
Data Source
AI summary
A magnetoresistive sensor includes at least one magnetoresistive element having a layer stack. The layer stack has at least one free layer that has a magnetization that is changeable in the layer plane and that varies depending on the field strength of an external magnetic field acting parallel to the layer plane. The magnetoresistive sensor furthermore has a shielding element that has a vortex magnetization with a closed flux in the layer plane, wherein the shielding element is configured, in the presence of the external magnetic field, to generate a linear magnetic stray field that is directed counter to the external magnetic field.