Tuning magneto-dielectric properties of Co2Z ferrites via Gd doping for high-frequency applications
Jian Wu(武剑)1, Bing Lu(卢冰)1, Ying Zhang(张颖)1, Yixin Chen(陈一鑫)1, Kai Sun(孙凯)1, Daming Chen(陈大明)2, Qiang Li(李强)3, Yingli Liu(刘颖力)1, and Jie Li(李颉)1,†
1 State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China; 2 School of Materials Science and Engineering, Hainan University, Haikou 570228, China; 3 School of Instrument and Electronics, North University of China, Taiyuan 030000, China
Abstract Magneto-dielectric properties of Co2Z ferrite materials are tuned via Gd doping for applications in high-frequency antennas and filters in the present work. Ba3Co2Fe24-xGdxO41 (x = 0.00, 0.05, 0.10, 0.15, and 0.20) materials are successfully prepared by using solid-state method at 925 ℃ for 4 h with 2.5-wt% Bi2O3 sintering aids. The content of Gd3+ ion can affect micromorphology, grain size, bulk density, and magneto-dielectric properties of the ferrite. With Gd3+ ion content increasing, saturation magnetization (Ms) first increases and then decreases. The maximum value of Ms is 44.86 emu/g at x =0.15. Additionally, sites occupied by Gd3+ ions can change magnetic anisotropy constant of the ferrite. Magnetocrystalline anisotropy constant (K1) is derived from initial magnetization curve, and found to be related to spin-orbit coupling and intersublattice interactions between metal ions. The real part of magnetic permeability (μ') and real part of dielectric permittivity (ε') are measured in a frequency range of 10 MHz-1 GHz. When x =0.15, material has excellent magneto-dielectric properties (μ' ≈ 12.2 and ε' ≈ 17.61), low magnetic loss (tan δμ ≈ 0.03 at 500 MHz), and dielectric loss (tan δε ≈ 0.04 at 500 MHz). The results show that Gd-doped Co2Z ferrite has broad application prospects in multilayer filters and high-frequency antennas.
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFB3504800), the National Natural Science Foundation of China (Grant Nos. 61901142, 52003256, and 51902037), and the Natural Science Foundation of Shanxi Province, China (Grant No. 201901D211259).
Corresponding Authors:
Jie Li
E-mail: lijie@uestc.edu.cn
Cite this article:
Jian Wu(武剑), Bing Lu(卢冰), Ying Zhang(张颖), Yixin Chen(陈一鑫), Kai Sun(孙凯), Daming Chen(陈大明), Qiang Li(李强), Yingli Liu(刘颖力), and Jie Li(李颉) Tuning magneto-dielectric properties of Co2Z ferrites via Gd doping for high-frequency applications 2023 Chin. Phys. B 32 097501
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