Optimizing magnetic and electrical properties of MnZn ferrites via spatially engineered Ni distributionOA
Manganese-zinc(MnZn)ferrites are widely employed in electromagnetic interference(EMI)suppression due to their favorable magnetic properties.However,their practical performance is often constrained by the inherent trade-offs among key magnetic properties,such as initial permeability(μi),standardized impedance(Z0),saturation magnetic induction(Bs),and Curie temperature(Tc).Here,we demonstrate a strategy that simultaneously enhances these properties by combining trace Ni doping with precise control of the sintering atmosphere.The low Ni concentration,together with a carefully regulated oxygen partial pressure,suppresses the diffusion driving force of Ni2+,leading to its spatially nonuniform distribution and preferential segregation at grain boundaries.This localized Ni enrichment facilitates the formation of transgranular magnetic domains across significant crystallographic misorientation grains.Furthermore,Ni-rich grain boundaries promote the migration of Fe^(3+)from octahedral(B)sites to tetrahedral(A)sites,thereby increasing the A−B and A−A bond angles,shortening the corresponding bond lengths,and strengthening the superexchange interactions within the spinel lattice.As a result of this spatially engineered Ni distribution,the optimized MnZn ferrite exhibits significantly improved properties,including aμi of 11,648 at 10 kHz,Z0 of 43Ω·mm^(-1)at 1 MHz,Bs of 524 mT at 1 kHz,1194 A·m^(-1),and Tc of 174℃,outperforming conventional MnZn ferrites.This work highlights spatial compositional engineering as a viable route to advanced soft magnetic materials for next-generation EMI suppression technologies.
Tao Wu;Chaoming Wang;Zenan Ma;Zhenyu He;Xiaofeng Zhang;Zhongwen Lan;Zhong Yu;Xiaona Jiang;Qifan Li;Chuanjian Wu;Ke Sun
School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaHengdian Group DMEGC Magnetics Company Limited,Dongyang 322100,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaHengdian Group DMEGC Magnetics Company Limited,Dongyang 322100,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,ChinaSchool of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China
信息技术与安全科学
manganese-zinc(MnZn)ferritesNi distributionmagnetic domainssuperexchange interaction
《Journal of Advanced Ceramics》 2026 (2)
P.221-231,11
supported by the Regional Joint Fund of the National Natural Science Foundation of China(No.U25A20244)the National Natural Science Foundation(Nos.52402332 and 52372255)the Science and Technology Department of Sichuan Province(Nos.2024NSFSC0999 and 2024ZHCG0135)the Central Guidance on Local Science and Technology Development Fund-Science and Technology Achievement Transformation Project(No.2025ZYDF023).
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