High-Frequency Magnetic Material Fractal Network Structure
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Solution Overview
Problem
Existing high-frequency magnetic materials face limitations in radio wave absorption properties at frequencies above several hundred megahertz due to small magnetic anisotropy and particle size constraints, leading to inferior performance in both compacted powder-resin composites and flattened particle structures.
Innovation Solution
A high-frequency magnetic material comprising metal nanoparticles with diameters ≤200 nm, forming network-like structures with first clusters ≤10 μm and second clusters ≤100 μm, utilizing Fe, Co, and Ni metals, and optionally coated with oxides to enhance magnetic loss and conductive properties, achieving a fractal network structure for improved radio wave absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic substance powder particles are electrically insulated in compact of mixture with resin, then electrical insulation is achieved, but radio wave absorption property at high frequency deteriorates
Solution Approach 1:
The invention extracts and removes the electric insulating material that was previously used to coat magnetic particles. By eliminating this insulating layer, the magnetic particles can directly contact each other to form continuous networks, enabling superior radio wave absorption at high frequencies while maintaining the desired electrical insulation through the resin matrix alone.
Solution Approach 2:
The invention creates a composite structure where magnetic particles form continuous networks within a resin matrix. The resin provides the necessary electrical insulation while the continuous magnetic particle networks enable enhanced radio wave absorption through improved magnetic loss mechanisms.
2Object-affected harmful factors
If flattened magnetic particles are used to provide magnetic anisotropy, then magnetic anisotropy is improved, but particle size limit restricts radio wave absorption at high frequency
Solution Approach 1:
The invention changes the size parameter of magnetic particles from conventional larger sizes to nanoscale dimensions (average diameter of 10 nm to 200 nm). This parameter change enables the formation of continuous networks while maintaining high magnetic anisotropy, thereby achieving superior radio wave absorption at high frequencies without being constrained by traditional particle size limits.
Solution Approach 2:
The invention creates a nested hierarchical structure where nanoscale magnetic particles are embedded within first clusters (average diameter 1 μm to 10 μm), which are in turn embedded within second clusters (average diameter 10 μm to 100 μm). This nested arrangement allows small nanoparticles to form extended continuous networks through cluster aggregation, combining the benefits of small particle size with large-scale connectivity.
3Object-affected harmful factors
If metal nanoparticles with small size are used, then high-frequency magnetic properties are improved, but network formation capability is reduced
Solution Approach 1:
The invention implements a nested hierarchical structure where nanoscale magnetic particles (10-200 nm) form first clusters (1-10 μm), which aggregate to form second clusters (10-100 μm). This nested arrangement enables small nanoparticles to achieve extended network continuity through hierarchical aggregation, solving the problem of network formation while maintaining high-frequency magnetic properties.
Solution Approach 2:
The invention creates a composite hierarchical structure combining nanoscale magnetic particles with resin materials. The magnetic particles form continuous networks at the nanoscale while the resin matrix provides structural support and electrical insulation, enabling both high-frequency magnetic performance and stable network formation.
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 material exhibits superior radio wave absorption properties across high-frequency ranges with enhanced magnetic and conductive losses, effectively addressing previous limitations by optimizing particle size, structure, and composition for improved magnetic permeability and resonance frequencies.
Implementation Method 1
a magnetic substance containing metal nanoparticles, the metal nanoparticles are magnetic metals containing at least one kind of Fe, Co, and Ni
Implementation Method 2
the magnetic loss of a magnetic substance is used... the radio wave absorption property depends on the magnitude of the imaginary component μ′′ of complex magnetic permeability
Data Source
AI summary
To provide a high-frequency magnetic material having a superior radio wave absorption property in a high frequency region and a method of manufacturing the same. The high-frequency magnetic material and the method of manufacturing the same includes a magnetic substance containing metal nanoparticles, the metal nanoparticles are magnetic metals containing at least one kind of Fe, Co, and Ni, an average particle diameter of the metal nanoparticles is equal to or less than 200 nm, first clusters having network-like structures with continuous metal nanoparticles and the average diameter equal to or less than 10 μm are formed, second clusters having network-like structures with the continuous first clusters and the average diameter equal to or less than 100 μm are formed, and the entire magnetic substance has a network-like structure with the continuous second clusters.