Magnetic Field Detection Device With Inverted Tapered Yoke
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Solution Overview
Problem
Current magnetic field detection devices have limitations in achieving superior magnetic field detection performance, particularly in efficiently concentrating magnetic flux on the magnetization free layer.
Innovation Solution
The magnetic field detection device incorporates a base with a first yoke having an inverted tapered surface and a magneto-resistive effect element with a magnetization free layer positioned to overlap with the yoke, where the distance from the center point of the magnetization free layer to the edges is optimized to concentrate magnetic flux effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional yoke structure is used, then the device structure is simple, but the magnetic field detection performance is insufficient
Solution Approach 1:
The yoke structure employs an inverted tapered surface configuration where the first end surface includes an inverted tapered surface that extends closer to the center point of the magnetization free layer. This asymmetric geometry creates non-uniform magnetic flux distribution that concentrates magnetic field lines on the magnetization free layer, thereby improving detection precision without requiring complex additional components
Solution Approach 2:
The invention introduces a dimensional variation by inclining the first end surface relative to the first plane at a specific angle. This angular inclination in the vertical dimension modifies the magnetic flux path and concentrates flux density on the magnetization free layer, enhancing detection performance while maintaining a relatively simple yoke structure
2Measurement precision
If the yoke is positioned far from the magnetization free layer, then the structure is simpler to manufacture, but the magnetic flux concentration is insufficient
Solution Approach 1:
The inverted tapered surface creates an asymmetric geometry where the yoke progressively approaches the magnetization free layer from one side rather than maintaining uniform distance. This asymmetric configuration naturally concentrates magnetic flux on the magnetization free layer while providing manufacturing tolerances in other areas, balancing flux concentration requirements with manufacturability
Solution Approach 2:
The invention modifies the geometric parameters of the yoke by introducing an inclined first end surface with a specific angle relative to the base plane. This parameter change optimizes the magnetic flux concentration effect while establishing clear manufacturing specifications for the inclination angle, thereby balancing performance requirements with manufacturing precision capabilities
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 enhances the magnetic field detection performance by efficiently concentrating magnetic flux on the magnetization free layer, leading to improved detection capabilities.
Implementation Method 1
a magneto-resistive effect element provided on the base, and including a magnetization free layer that is disposed at a position overlapped with the first yoke
Data Source
AI summary
A magnetic field detection device includes a base, a first yoke, and a magneto-resistive effect element. The first yoke is provided on the base, and includes first and second principal surfaces each extending along a first plane, and a first end surface coupling the first and second principal surfaces. The magneto-resistive effect element is provided on the base, and includes a magnetization free layer disposed at a position overlapped with the first yoke in a first direction along the first plane. The first end surface includes an inverted tapered surface inclined relative to the first plane and extending closer to a center point of the magnetization free layer as being away from the base in a second direction orthogonal to the first plane. A distance from the center point to a first edge is shorter than a distance from the center point to a second edge.