Tuning magneto-dielectric properties of Co_(2)Z ferrites via Gd doping for high-frequency applications  

作　　者：武剑 卢冰 张颖 陈一鑫 孙凯 陈大明 李强 刘颖力 李颉 Jian Wu;Bing Lu;Ying Zhang;Yixin Chen;Kai Sun;Daming Chen;Qiang Li;Yingli Liu;Jie Li(State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China;School of Materials Science and Engineering,Hainan University,Haikou 570228,China;School of Instrument and Electronics,North University of China,Taiyuan 030000,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第9期468-473,共6页中国物理B（英文版）

基　　金：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);the Natural Science Foundation of Shanxi Province,China(Grant No.201901D211259)。

摘　　要：Magneto-dielectric properties of Co_(2)Z ferrite materials are tuned via Gd doping for applications in high-frequency antennas and filters in the present work.Ba_(3)Co_(2)Fe_(24-x)Gd_(x)O_(41)(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%Bi_(2)O_(3)sintering aids.The content of Gd^(3+)ion can affect micromorphology,grain size,bulk density,and magneto-dielectric properties of the ferrite.With Gd^(3+)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 Gd^(3+)ions can change magnetic anisotropy constant of the ferrite.Magnetocrystalline anisotropy constant(K_1)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 andε′≈17.61),low magnetic loss(tanδμ≈0.03 at 500 MHz),and dielectric loss(tanδε≈0.04 at 500 MHz).The results show that Gd-doped Co_(2)Z ferrite has broad application prospects in multilayer filters and high-frequency antennas.

关 键 词：Co_(2)Z ferrite magneto-dielectric properties Gd doping high-frequency applications 

分 类 号：TN04[电子电信—物理电子学]