Magnetic Field Sensor Core Segmentation for Signal Resolution
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Solution Overview
Problem
Existing magnetic field measurement technologies, such as fluxgate sensors, face limitations in miniaturization due to the decrease in signal amplitude and increase in noise with smaller core volumes, making it difficult to accurately measure small magnetic fields with high resolution.
Innovation Solution
The use of a magnetically anisotropic core with specific dimensions and a nickel-iron alloy, configured as multiple layers with non-magnetic intermediate layers, allows for rapid remagnetization through Bloch wall displacement, enabling a stronger signal and improved time resolution, which is independent of exciter coil frequency, facilitating miniaturization and integration into microelectromechanical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the core volume is reduced for miniaturization, then the device size is reduced, but the signal amplitude decreases and noise increases
Solution Approach 1:
The core is divided into multiple magnetic layers separated by non-magnetic intermediate layers. This segmentation allows each layer to contribute to the signal while maintaining a compact overall structure, resolving the contradiction between miniaturization and signal strength
Solution Approach 2:
The core uses composite structure with alternating magnetic and non-magnetic layers. This composite material approach enables rapid remagnetization through Bloch wall displacement in each magnetic layer, maintaining high signal amplitude despite reduced core volume
2Volume of moving object
If the core dimensions are reduced, then the device is miniaturized, but the time resolution deteriorates
Solution Approach 1:
The patent changes the magnetic parameters of the core material and structure to enable rapid remagnetization. By using多层 magnetic structures with specific thicknesses and introducing non-magnetic intermediate layers, the remagnetization time is reduced, improving time resolution even in miniaturized cores
3Measurement precision
If the hysteresis curve is made steeper to improve measurement accuracy, then the rise time is improved, but the optimization is limited by manufacturing constraints
Solution Approach 1:
Instead of optimizing a single bulk material, the patent segments the core into multiple thin magnetic layers with non-magnetic intermediates. This segmentation achieves steep effective hysteresis through the collective behavior of layers, bypassing manufacturing limitations of single-material optimization
Solution Approach 2:
The composite magnetic structure with non-magnetic intermediate layers creates an effective steep hysteresis curve that is achievable through standard thin-film deposition processes, overcoming the manufacturing constraints that limit single-material optimization
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 approach allows for the precise measurement of small magnetic fields with improved time resolution and signal strength, enabling the miniaturization of magnetic field sensors and their integration into microchips, while maintaining accuracy and sensitivity.
Implementation Method 1
an exciter coil for remagnetizing the core material... detection, using a measurement coil (pickup coil), of the time-dependent flux thereby generated
Implementation Method 2
remagnetization is accomplished by displacing at least one Bloch wall. Because Bloch wall displacements take place at a speed of approximately 100 m/s
Implementation Method 3
This magnetically anisotropic layer preferably exhibits two-fold symmetry (180° symmetry) in terms of magnetization
Implementation Method 4
detection, using a measurement coil (pickup coil), of the time-dependent flux thereby generated. The change in flux is determined by the magnetization curve of the soft magnetic core
Data Source
AI summary
An apparatus for measuring a magnetic field is described, which comprises a core and an exciter coil for remagnetizing the core material. The remagnetizable core material is embodied as a layer or as multiple layers disposed at a distance from one another, and the core has a maximum total extension G where 2.5 mm≧G≧0.2 mm, a ratio of length to width that is greater than or equal to a value of twenty, and a thickness D where 2 μm≧D≧0.2 μm. Also described is a corresponding method for measuring a magnetic field.