Magnetic Sensor With Concentrated AC Field for High Sensitivity
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Solution Overview
Problem
Current magnetic sensors have limitations in detection sensitivity, which hinders their effectiveness in accurately measuring magnetic fields.
Innovation Solution
The magnetic sensor design incorporates a first element with a magnetic layer, a counter magnetic layer, and a nonmagnetic layer, along with a wire and a magnetic part, where the wire extends in a direction perpendicular to the magnetic layers and the magnetic part is positioned to concentrate alternating-current magnetic fields, enhancing detection sensitivity by efficiently applying these fields to the sensor element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional magnetic sensor structure is used, then the device complexity is low, but the detection sensitivity is insufficient
Solution Approach 1:
The magnetic sensor is divided into multiple functional layers including a magnetic layer, counter magnetic layer, and nonmagnetic layer. Each layer serves a specific function in detecting magnetic fields, allowing the complex detection task to be segmented into manageable components that work together to achieve high detection sensitivity.
Solution Approach 2:
A nonmagnetic layer is introduced as an intermediary between the magnetic layer and counter magnetic layer. This nonmagnetic layer facilitates the interaction between magnetic fields and the sensor elements while maintaining structural integrity, enabling enhanced detection sensitivity without excessive complexity.
2Measurement precision
If alternating-current magnetic fields are applied to enhance detection, then the detection sensitivity increases, but the energy consumption increases
Solution Approach 1:
Alternating-current magnetic fields are applied periodically to the magnetic sensor to enhance detection sensitivity. The periodic nature of the alternating current allows for pulsed excitation of the magnetic layers, enabling high sensitivity measurements while managing energy consumption through controlled intermittent operation rather than continuous high-power application.
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 increases the detection sensitivity of the magnetic sensor, allowing for more precise measurement of magnetic fields by effectively concentrating and applying alternating-current magnetic fields.
Implementation Method 1
the magnetic part is positioned to concentrate alternating-current magnetic fields, enhancing detection sensitivity by efficiently applying these fields to the sensor element
Implementation Method 2
a first element including a first magnetic layer, a first counter magnetic layer, and a first nonmagnetic layer provided between the first magnetic layer and the first counter magnetic layer
Data Source
AI summary
According to one embodiment, a magnetic sensor includes a first element, a first wire, and a first magnetic part. The first element includes a first magnetic layer, a first counter magnetic layer, and a first nonmagnetic layer provided between the first magnetic layer and the first counter magnetic layer. A direction from the first counter magnetic layer toward the first magnetic layer is along a first direction. The first wire extends in a second direction crossing the first direction. The first magnetic part includes a first region and a first counter region. At least a portion of the first wire is between the first region and the first counter region in the first direction.