Composite Magnetic Body for High Frequency Low Loss
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Solution Overview
Problem
Conventional magnetic composite materials fail to simultaneously achieve high magnetic permeability and low magnetic loss in high frequency bands, particularly in GHz frequencies.
Innovation Solution
A composite magnetic body comprising metal particles with Fe or Fe and Co as the main component, a resin, and voids, where the metal particles have an average major axis diameter of 30 to 500 nm, an aspect ratio of 1.5 to 10, and a saturation magnetization of 300 to 600 emu/cm3, with voids present at 0.2 to 10 area % and an average equivalent circle diameter of 1 μm or less, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic metal particles with high magnetic permeability are used, then magnetic permeability is improved, but magnetic loss increases
Solution Approach 1:
The patent changes the size parameter of magnetic particles to the nanometer scale (30-500 nm) and controls their aspect ratio (1.5-10), which fundamentally alters the magnetic properties. This parameter change enables achieving high magnetic permeability while suppressing magnetic loss in the GHz frequency range, resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite magnetic body by dispersing magnetic metal particles in a resin matrix. This composite structure allows the magnetic particles to provide high permeability while the resin binder suppresses eddy current losses, thereby achieving both high magnetic permeability and low magnetic loss simultaneously.
2Ease of manufacture
If conventional magnetic composite materials are used, then ease of manufacture is improved, but magnetic loss increases at high frequencies
Solution Approach 1:
The patent specifies precise parameter ranges for magnetic particles (size: 30-500 nm, aspect ratio: 1.5-10) that enable both ease of manufacture through screen printing and low magnetic loss at high frequencies. These parameter changes allow the material to be processed using conventional techniques while achieving superior high-frequency performance.
3Adaptability or versatility
If magnetic materials are miniaturized for compact shapes, then adaptability is improved, but magnetic loss increases
Solution Approach 1:
The patent uses nanometer-scale magnetic particles (30-500 nm) with controlled aspect ratios that can be densely packed in compact shapes while maintaining low magnetic loss. The small particle size enables miniaturization and complex shape formation without increasing magnetic loss, unlike conventional larger particles.
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 enables high magnetic permeability and low magnetic loss across a wide range of high frequency bands, effectively addressing the limitations of existing technologies.
Implementation Method 1
high magnetic permeability and low magnetic loss can be obtained in a high frequency band
Implementation Method 2
low magnetic loss can be obtained in a high frequency band
Data Source
AI summary
The present invention provides a composite magnetic body comprising metal particles containing Fe or Fe and Co as a main component, a resin, and voids, wherein an average major axis diameter of the metal particles is 30 to 500 nm, an average aspect ratio of the metal particles is 1.5 to 10, and in a cross section of the composite magnetic body, a percent presence of the voids is 0.2 to 10 area % and an average equivalent circle diameter of the voids is 1 μm or less, and a saturation magnetization of the composite magnetic body is 300 to 600 emu/cm3.