Synergistic modulation of magnetic and dielectric properties in high-Bi-content garnet ferrites

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-06-24 DOI:10.1016/j.jeurceramsoc.2025.117639

Yang Xiao , Jie Li , Yan Yang , Yida Lei , Yanlin Ma , Yingli Liu

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引用次数: 0

Abstract

Garnet-type ferrites Bi_1.2Ca_3xY_1.8–3xZr_xV_xFe_5–2xO₁₂ (x = 0.1–0.6) were synthesized via solid-state reaction, with Bi–Ca ions predominantly occupying dodecahedral c-sites. The phase stability and microstructure were significantly improved through Ca-Zr-V multi-ion doping, which served as the foundation for excellent magnetic and dielectric properties. The dielectric constant (ε_r > 22) was increased by the strong spin-orbit coupling and high polarizability of Bi³⁺ . The Bi³⁺-induced magnetocrystalline anisotropy was suppressed by Zr⁴⁺ and V⁵⁺, which lowered the ferromagnetic resonance (FMR) linewidth (ΔH) to 73.06 Oe. Grain refinement shortened the spin-wave propagation path, leading to a maximum spin-wave linewidth (ΔH_k) of 13.10 Oe. At x = 0.50, optimal properties were achieved (ε_r = 22.43, tanδ_ε = 1.26 ×10_-³, ΔH = 73.06 Oe, ΔH_k = 10.30 Oe, M_s = 15.60 emu/g), and the synergistic optimization of high dielectric constant, low loss, and broad spin-wave linewidth was realized for the first time in ferrites for miniaturized circulators.

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高铋含量石榴石铁氧体磁性和介电性能的协同调制

通过固相反应合成了石榴石型铁素体Bi1.2Ca3xY1.8-3xZrxVxFe5-2xO12 (x = 0.1-0.6)，Bi-Ca离子主要占据十二面体c位。Ca-Zr-V多离子掺杂显著改善了材料的相稳定性和微观结构，为其优异的磁性和介电性能奠定了基础。介电常数εr >；由于Bi3+的强自旋-轨道耦合和高极化率，增加了离子强度。Zr4+和V5+抑制了Bi3+诱导的磁晶各向异性，使铁磁共振（FMR）线宽（ΔH）降低到73.06 Oe。晶粒细化缩短了自旋波传播路径，最大自旋波线宽（ΔHk）为13.10 Oe。在x = 0.50处，获得了最佳性能（εr = 22.43, tanδε = 1.26 ×10-3， ΔH = 73.06 Oe， ΔHk = 10.30 Oe, Ms = 15.60 emu/g），首次实现了小型化循环器用铁氧体高介电常数、低损耗和宽自旋波线宽的协同优化。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.