Co-Based Magnetic Impedance Sensor for Higher Field Sensitivity
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Solution Overview
Problem
Current magnetic sensors utilizing the magnetic impedance effect face limitations in sensitivity due to insufficient impedance changes relative to magnetic fields.
Innovation Solution
The magnetic sensor incorporates a sensitive element with a soft magnetic material layer made of an amorphous alloy, specifically Co-based with saturation magnetization between 300 and 650 emu/cc, and includes a magnetic domain suppression layer and a conductor layer to enhance sensitivity, with a Nb ratio between 17 and 21 at% to optimize impedance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional soft magnetic materials are used in the magnetic sensor, then the device structure can be simplified, but the sensitivity and impedance changes relative to magnetic fields are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the saturation magnetization of the soft magnetic material layer within 300-650 emu/cc and the Nb content within 17-21 at%. This optimization of material parameters maximizes the magnetic impedance effect and sensitivity while maintaining practical device feasibility
Solution Approach 2:
The patent employs composite materials by creating a multi-layer structure consisting of soft magnetic material layers, non-magnetic conductor layers, and non-magnetic antiferromagnetic coupling layers. This composite approach enhances the magnetic impedance effect through synergistic interactions between different material layers
2Measurement precision
If multiple soft magnetic material layers are used to enhance sensitivity, then the magnetic impedance effect is improved, but the device structure and manufacturing complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the soft magnetic material into multiple separate layers (first, second, and third soft magnetic material layers) with different thicknesses and magnetization characteristics. This segmentation allows each layer to contribute differently to the overall magnetic impedance effect, enhancing sensitivity while maintaining manageable structural complexity
Solution Approach 2:
The patent introduces intermediary layers (non-magnetic conductor layers and non-magnetic antiferromagnetic coupling layers) between the soft magnetic material layers. These intermediary layers facilitate magnetic coupling and electrical connectivity while preventing direct interaction between adjacent soft magnetic layers, thereby managing the complexity of multi-layer structures
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 significantly improves the sensitivity of the magnetic sensor by increasing impedance changes relative to magnetic fields, allowing for more accurate magnetic field measurements.
Implementation Method 1
The sensitive element is configured to sense a magnetic field by a magnetic impedance effect
Data Source
AI summary
A magnetic sensor 1 includes: a non-magnetic substrate 10; and a sensitive element 30 disposed on the substrate 10. The sensitive element 30 has a longitudinal direction and a transverse direction and has a uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction. The sensitive element 30 is configured to sense a magnetic field by a magnetic impedance effect. The sensitive element 30 includes a soft magnetic material layer 101 made of an amorphous alloy based on Co and having a saturation magnetization of greater than or equal to 300 emu/cc and less than or equal to 650 emu/cc.