Modified self-biased hexagonal gyromagnetic ferrite material and preparation method thereof

By introducing CaCO3, Bi2O3 and SiO2 into BaM hexagonal ferrite and optimizing the sintering process, a modified self-biased hexagonal gyromagnetic ferrite material suitable for microwave devices was prepared, which solved the contradiction between loss and magnetic performance improvement in the existing technology and achieved miniaturization and low loss of the device.

CN122102668APending Publication Date: 2026-05-29UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Application Number
CN202610361226.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-24
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing self-biased hexagonal ferrite materials are difficult to simultaneously meet the engineering requirements of low loss and wide bandwidth for microwave devices, especially due to the significant coupling contradiction between loss control and magnetic performance enhancement.

Method used

Based on BaM hexagonal ferrite, additives CaCO3, Bi2O3 and SiO2 were introduced, and modified self-biased hexagonal gyromagnetic ferrite materials with high saturation magnetization, remanence ratio and coercivity and low ferromagnetic resonance linewidth were prepared by optimizing the segmented sintering process, including negative pressure sintering and oxygen-enriched sintering.

Benefits of technology

It achieves miniaturization and low loss of microwave devices, meets engineering requirements, and has high saturation magnetization, remanence ratio and coercivity, reduces ferromagnetic resonance linewidth and improves device performance.

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Abstract

The invention belongs to the technical field of ferrite material preparation, and particularly provides a modified self-biased hexagonal gyromagnetic ferrite material and a preparation method thereof. The modified self-biased hexagonal gyromagnetic ferrite material comprises main components and an additive, wherein the main components comprise 74.5 mol%-82.8 mol% of Fe2O3, 1.3 mol%-6.1 mol% of Cr2O3 and the balance of BaCO3; the additive is prepared from the following components in percentage by weight: 0.5 to 2.0 percent of CaCO3, 0.5 to 2.0 percent of SiO2 and 0.1 to 2.0 percent of Bi2O3 by taking the weight of the pre-sintered main components as a calculation reference; the modified self-biased hexagonal gyromagnetic ferrite material (BaM) prepared by the method has the characteristics of high saturation magnetization (4pi Ms: 3.9-4.2 kGs), high remanence ratio (Mr / Ms: 0.6-0.8) and coercive force (Hc: 450-550Oe) and low ferromagnetic resonance line width (delta H: 230-280Oe) through sintering process optimization, and meets the engineering requirements of microwave devices.
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