Magnonic Crystal Spin Wave Device Frequency Control
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Solution Overview
Problem
Conventional spin wave controlling methods using magnonic crystals face challenges in accurately controlling frequency due to manufacturing complexities and limited effectiveness in filtering a broad range of frequencies, as they require periodic arrangement of different magnetic materials, leading to interface issues and small bandgap widths.
Innovation Solution
A spin wave device with a waveguide made of single magnetic material featuring a magnonic crystal part with a cross-section that periodically changes in shape, area size, or center line, allowing for easy frequency control and improved integration by forming two or three-dimensional stationary waves with larger bandgaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnonic crystal structures with periodic multilayered magnetic materials are used, then spin wave frequency control is achieved, but manufacturing complexity increases and interface quality deteriorates
Solution Approach 1:
The patent uses a single magnetic material throughout the waveguide structure, eliminating the need for periodic multilayered magnetic materials with different properties. The magnonic crystal structure is formed by periodic modulation of the cross-sectional area of this homogeneous material, simplifying manufacturing while maintaining frequency control capability through geometric rather than material periodicity
Solution Approach 2:
The patent changes the cross-sectional area parameter of the waveguide periodically along its length to create the magnonic crystal structure. This geometric parameter modulation achieves the desired bandgap and frequency control without requiring changes in material composition, thereby reducing manufacturing complexity and interface issues
2Measurement precision
If periodic multilayered magnetic structures are used, then spin wave filtering is achieved, but bandgap width decreases
Solution Approach 1:
By modulating the cross-sectional area parameter of a single magnetic material waveguide, the patent achieves effective spin wave filtering with broader bandgaps. The geometric modulation creates sufficient magnetic property variation without the limitations of thin-film interfaces, resulting in enhanced frequency selectivity
3Measurement precision
If different magnetic materials are periodically arranged, then spin wave frequency control is achieved, but interface quality deteriorates
Solution Approach 1:
The patent employs a homogeneous single magnetic material throughout the waveguide, eliminating interfaces between different magnetic materials. The magnonic crystal functionality is achieved through geometric cross-sectional modulation rather than material composition changes, thereby ensuring high interface quality and device reliability
Solution Approach 2:
The patent extracts the essential functionality of magnonic crystals (periodic modulation of magnetic properties) from the complex multilayered structure and implements it through simple geometric cross-sectional area modulation of a single material, removing the harmful interface elements while preserving the desired frequency control effect
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 simplifies the manufacturing process, enhances integration level, and allows precise control of spin wave frequencies, improving information processing speed by forming larger bandgaps that effectively filter a broader range of frequencies.
Implementation Method 1
Spin waves (called magnons) are collective excitations of individual spins in ordered magnets
Implementation Method 2
the frequency bandgap existing in the frequency range of the spin wave is formed within the magnetic material and hence the spin wave with the specific frequency and wavelength may not pass through the magnetic material
Data Source
AI summary
There is provided a magnonic-crystal spin wave device capable of controlling a frequency of a spin wave. The magnonic-crystal spin wave device according to the invention includes a spin wave waveguide made of magnetic material, and the spin wave waveguide guides the spin wave so as to propagate in one direction, and includes a magnonic crystal part which has a cross-section orthogonal to the direction, and at least one of a shape, area size, and center line of the cross-section periodically changes in the direction. In accordance with the invention, it is possible to easily control the frequency of the spin wave using the spin wave waveguide made of single magnetic material.