Magnetoresistive Effect Device High-Frequency Signal Filtering
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Solution Overview
Problem
There is a lack of specific configurations for applying magnetoresistive effect elements to high-frequency devices, such as filters, which limits their utilization in high-frequency applications.
Innovation Solution
A magnetoresistive effect device is designed with a magnetization fixed layer, a spacer layer, and a magnetization free layer, capable of varying its magnetization direction, along with a high-frequency signal input port, output port, signal lines, and a direct-current input terminal, allowing a high-frequency magnetic field to be applied to the magnetization free layer to achieve frequency characteristics as a high-frequency filter, isolator, or variable frequency filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetoresistive effect elements are used in high-frequency devices, then frequency selectivity and signal processing capability are improved, but device configuration complexity and integration difficulty increase due to lack of specific configurations
Solution Approach 1:
The device is divided into distinct functional modules: magnetoresistive effect elements (with fixed and free magnetization layers), signal lines for high-frequency signals, direct-current supply lines, and frequency setting mechanisms. This segmentation allows each component to be optimized independently while maintaining overall system functionality, reducing integration complexity.
Solution Approach 2:
The magnetoresistive effect device is designed to perform multiple functions including filtering, frequency selection, and signal processing across different frequency bands. The same basic structure can be configured for different applications by adjusting the magnetization layers and operating parameters, reducing the need for separate dedicated components.
2Measurement precision
If ferromagnetic resonance frequency is fixed, then filter performance at specific frequency is improved, but adaptability to different frequency bands deteriorates
Solution Approach 1:
The device incorporates frequency setting mechanisms that allow dynamic adjustment of the ferromagnetic resonance frequency. By changing the effective magnetic field through adjustable direct-current supplies or external magnetic fields, the resonance frequency can be tuned to match different operating frequency bands, enabling the same device to serve multiple frequency ranges.
Solution Approach 2:
The effective magnetic field parameter is made variable through adjustable direct-current supplies and external magnetic field application. Changing this parameter directly adjusts the ferromagnetic resonance frequency, allowing the device to adapt to different frequency bands while maintaining sharp frequency selectivity at the target frequency.
3Stability of the object's composition
If magnetization direction is fixed, then device stability is improved, but ability to vary resonance frequency deteriorates
Solution Approach 1:
The magnetization system is segmented into two distinct layers: a fixed magnetization layer that provides stable reference magnetization and a free magnetization layer that can be dynamically adjusted. This segmentation allows the fixed layer to maintain stability while the free layer responds to external magnetic fields for frequency tuning.
Solution Approach 2:
A spacer layer is introduced as an intermediary between the fixed and free magnetization layers. This spacer layer allows magnetic field penetration and interaction between the layers while maintaining their structural separation, enabling the free layer to be influenced by external fields for frequency adjustment without compromising the stability provided by the fixed layer.
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 device effectively functions as a high-frequency filter, isolator, or variable frequency filter, capable of selectively passing signals near the ferromagnetic resonance frequency, with adjustable ferromagnetic resonance frequency and phase shifting capabilities, enhancing signal amplification and bandwidth control.
Implementation Method 1
A magnetoresistive effect device according to an embodiment of the present invention includes at least one magnetoresistive effect element including a magnetization fixed layer, a spacer layer, and a magnetization free layer the direction of magnetization of which is capable of being varied
Implementation Method 2
One phenomenon that has received attention is ferromagnetic resonance phenomenon caused by a magnetoresistive effect element. Application of an alternating-current magnetic field to a ferromagnetic film of the magnetoresistive effect element causes ferromagnetic resonance in magnetization of the ferromagnetic film, and the magnetization of the ferromagnetic film greatly oscillates at frequencies near a ferromagnetic resonance frequency
Data Source
AI summary
A magnetoresistive effect device includes at least one magnetoresistive effect element including a magnetization fixed layer, a spacer layer, and a magnetization free layer, a first port, a second port, a first signal line which is connected to the first port and through which high-frequency current corresponding to a high-frequency signal input into the first port flows, a second signal line, and a direct-current input terminal. The magnetoresistive effect element is arranged so that a high-frequency magnetic field occurring from the first signal line is applied to the magnetization free layer. The magnetoresistive effect element is connected to the second port via the second signal line. The direct-current input terminal is connected to the magnetoresistive effect element.