Ferrite Magnet Fe2+ Optimization for High Br and HcJ
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Solution Overview
Problem
Conventional ferrite magnets face challenges in achieving high residual magnetic flux density (Br) and coercive force (HcJ), with La—Co ferrite magnets having limited Br and ferrite magnets with high Fe2+ content compromising Br for increased HcJ.
Innovation Solution
A ferrite magnet with a magnetoplumbite structure, comprising specific constitutional proportions of Sr, Ba, Ca, rare earth elements, Co, Zn, and controlled Fe2+ and Si content, optimized within specific ranges to enhance Br and HcJ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If Fe2+ content is increased to improve HcJ, then coercive force increases, but residual magnetic flux density decreases
Solution Approach 1:
The invention optimizes the Fe2+ content parameter within a specific range (0.1-5.4 mass%) to simultaneously achieve high coercive force and high residual magnetic flux density. This parameter optimization resolves the contradiction by finding the optimal balance point where both magnetic properties are improved, rather than allowing one to increase at the expense of the other.
2Reliability
If conventional La-Co ferrite composition is used, then magnetic characteristics are improved, but residual magnetic flux density does not exceed 4.7 kG
Solution Approach 1:
The invention creates a composite ferrite material containing multiple elements (La, Co, Zn, Fe2+) in specific combinations and proportions. This composite approach allows the material to achieve residual magnetic flux density exceeding 4.7 kG while maintaining good coercive force, overcoming the limitations of conventional single-phase La-Co ferrite.
Solution Approach 2:
The invention changes the compositional parameters by introducing Zn and optimizing the Fe2+ content within a specific range (0.1-5.4 mass%). These parameter changes enable the material to achieve Br > 4.7 kG while maintaining high HcJ, resolving the contradiction between magnetic characteristics and residual flux density.
3Volume of moving object
If miniaturization of electronic components is pursued, then component size decreases, but magnetic performance requirements become more stringent
Solution Approach 1:
The invention optimizes compositional parameters (Fe2+ content: 0.1-5.4 mass%, Zn content: 0.5-5.0 mass%) to achieve high magnetic performance in smaller magnet volumes. This allows miniaturized electronic components to maintain high Br and HcJ despite reduced size, resolving the contradiction between component size and magnetic performance requirements.
Data Source
AI summary
This ferrite magnet has a magnetoplumbite structure and is characterized in that, when representing the composition ratios of the total of each metal element A, R, Fe and Me with expression (1) A1-xRx(Fe12-yMey)z, the Fe2+ content (m) in the ferrite magnet is greater than 0.1 mass % and less than 5.4 mass % (in expression (1), A is at least one element selected from Sr, Ba, Ca and Pb; R is at least one element selected from the rare-earth elements (including Y) and Bi, and includes at least La, and Me is Co, or Co and Zn). The invention makes it possible to achieve a ferrite magnet with increased Br.