Magnetic Impedance Element Ceramic Composition Room Temperature Operation
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Solution Overview
Problem
Existing magnetic sensors have a narrow range of magnetic field detection and are limited to low temperatures and strong magnetic fields, making them unsuitable for practical applications at room temperature and varying magnetic field strengths.
Innovation Solution
A magnetic impedance element with a ceramic body represented by the chemical formula Sr2-xBaxFeyMozO6 (0.8≦x≦2.0), featuring external electrode terminals and a through conductor, which achieves a high rate of change in magnetic impedance at room temperature and improved responsivity to lower magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If colossal magnetoresistance (CMR) material is used to achieve larger change in magnetic resistance, then the rate of change in magnetic resistance is improved, but the operating temperature is limited to low temperatures and requires strong magnetic field
Solution Approach 1:
The patent changes the chemical composition parameters of the ceramic body by substituting Sr with Ba in controlled amounts (0.8≦x≦2.0 in Sr2-xBaxFeyMozO6) and adjusting Fe/Mo ratios to optimize the ferromagnetic transition temperature to above 85°C, enabling room temperature operation while maintaining high magnetic impedance change rate
Solution Approach 2:
The patent uses a composite oxide ceramic material combining Sr/Ba, Fe, and Mo in specific ratios to create a material that exhibits both high ferromagnetic transition temperature and large magnetic impedance change, resolving the contradiction between operating temperature and sensitivity
2Temperature
If tunneling magnetoresistance (TMR) element is used, then the element can operate at low temperature and low magnetic field, but the sensing range becomes narrow
Solution Approach 1:
The patent adjusts the chemical composition parameters (Sr/Ba ratio, Fe/Mo ratio) to achieve a ferromagnetic transition temperature above 85°C, which expands the operational temperature range and enables the sensor to function across a wider magnetic field range including room temperature, unlike TMR elements limited to low temperatures
3Measurement precision
If metal ferromagnets or semiconductors are used in AMR, GMR, or MI devices, then the sensors are responsive to low magnetic fields, but they have narrow magnetic field detection range and are saturated instantly by strong magnetic field
Solution Approach 1:
The patent employs a composite oxide ceramic material with specific stoichiometry (Sr2-xBaxFeyMozO6) that combines the advantages of different materials, providing both high responsivity to low magnetic fields and extended detection range up to several thousand Gauss, avoiding the saturation problem of metal ferromagnets
Solution Approach 2:
By controlling the substitution parameter x and the Fe/Mo ratio in the ceramic composition, the patent optimizes the magnetic properties to achieve linear response characteristics across a wide magnetic field range from low fields to strong fields, eliminating the narrow detection range limitation
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 solution enables a wide operating range for magnetic sensors with a high rate of change in magnetic impedance (20% or more) at 500 G and a ferromagnetic transition temperature above 85°C, enhancing responsiveness to lower magnetic fields and reducing variations.
Implementation Method 1
a magnetic impedance element including a ceramic body represented by a chemical formula Sr2-xBaxFeyMozO6 (0.8≦x≦2.0, y+z=2), and at least two external electrode terminals provided on the ceramic body... achieves a high rate of change in magnetic impedance at room temperature or higher... enhances responsiveness to lower magnetic fields
Implementation Method 2
a ferromagnetic transition temperature above 85°C... The foregoing element has the problem of the need for a high magnetic field around room temperature or higher because of a small rate of change in spite of having high ferromagnetic transition temperature
Data Source
AI summary
In order to provide a magnetic impedance element capable of achieving a large magnetic impedance effect at room temperature or higher, the magnetic impedance element includes a ceramic body represented by the chemical formula Sr2-xBaxFeyMozO6 (0.8≦x≦2.0, y+z=2), and at least two electrode terminals are provided on the ceramic body.