Magnetic Sensor Permalloy Flux Guide for Induced Field Strength
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Solution Overview
Problem
Existing magnetic sensors face challenges in increasing the strength of the induced magnetic field applied to the magnetoresistance effect element due to limitations in the cross-sectional area of the wiring line and difficulties in dissipating Joule heat.
Innovation Solution
The magnetic sensor incorporates a magnetically permeable section made of ferromagnetic material on the surfaces of the wiring line, excluding the surface facing the magnetoresistance effect element, to collect and enhance the induced magnetic field applied in the desired direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross-sectional area of the wiring line is increased to strengthen the induced magnetic field, then the magnetic field strength is improved, but the wiring line occupies more space and generates more Joule heat
Solution Approach 1:
A magnetically permeable section is introduced as an intermediary component between the wiring line and the magnetoresistance effect element. This section has high magnetic permeability, allowing it to concentrate and guide the induced magnetic field from the wiring line to the magnetoresistance effect element more effectively, thereby strengthening the magnetic field without requiring a larger wiring line cross-sectional area
Solution Approach 2:
The magnetic permeability parameter of the section is changed to be significantly higher than that of the wiring line. By selecting materials with high magnetic permeability for the magnetically permeable section, the magnetic field concentration effect is enhanced, allowing the same wiring line cross-sectional area to produce a stronger effective magnetic field at the magnetoresistance effect element
2Strength
If the amount of current flowing through the wiring line is increased to strengthen the induced magnetic field, then the magnetic field strength is improved, but Joule heat dissipation becomes more difficult
Solution Approach 1:
The magnetically permeable section serves as a magnetic flux guide that efficiently transfers the magnetic field generated by the wiring line current to the magnetoresistance effect element. This intermediary structure allows the use of higher currents for stronger magnetic fields while the section itself helps manage the magnetic flux distribution, reducing the direct thermal coupling between the wiring line and the magnetoresistance element
3Strength
If a magnetically permeable section is added to collect and enhance the induced magnetic field, then the magnetic field strength is improved, but the device structure becomes more complex
Solution Approach 1:
The magnetically permeable section is integrated with the wiring line structure, combining the electrical conduction function of the wiring line with the magnetic field concentration function. This merging of functions reduces the need for separate, independent components and simplifies the overall device structure while still achieving enhanced magnetic field strength
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 increases the strength of the induced magnetic field applied to the magnetoresistance effect element, enabling more efficient noise reduction and improved magnetic field detection capabilities.
Implementation Method 1
a magnetically permeable section disposed on at least part of a surface of surfaces other than the first surface among surfaces of the wiring line, the magnetically permeable section comprising a ferromagnetic material
Implementation Method 2
an induced magnetic field generated when the wiring line is energized is applied to the magnetoresistance effect element in the first direction
Data Source
AI summary
A magnetic sensor includes a magnetoresistance effect element including a pinned magnetic layer, a free magnetic layer, and an intermediate layer formed between the pinned magnetic layer and the free magnetic layer, the magnetoresistance effect element having a sensitivity axis in a first direction, a wiring line disposed in a second direction parallel to a stack direction of the magnetoresistance effect element and intersecting the first direction, the wiring line having a first surface facing the magnetoresistance effect element, and a magnetically permeable section disposed on at least part of a surface of surfaces other than the first surface among surfaces of the wiring line, the magnetically permeable section comprising a ferromagnetic material. The wiring line is disposed such that an induced magnetic field generated when the wiring line is energized is applied to the magnetoresistance effect element in the first direction.