摘要
采用有效媒质理论模拟和实验验证的方法,研究了核壳型磁性颗粒的微波磁导率。结果表明:核壳结构有利于提高微波下颗粒的复磁导率,2GHz时,其实部比氧化后的颗粒提高6%-12%,虚部提高15%~30%。片状椭球形核壳结构优于球形核壳结构,2GHz时,20nm壳层厚的片状颗粒的复磁导率为4.85—1.71 i,而同壳层厚的球状颗粒为4.55—1.31 i。在核壳结构的颗粒中,壳层厚度薄有利于改善磁导率。
Microwave permeability of magnetic particles with core-shell type were investigated by methods of simulation of effective medium theory and experimental verification. Results show that microwave complex permeability is advanced via core-shell microstructure of particles, the real-part with core-shell is increased 6%-10% than oxidized particles in 2 GHz, and the imaginary-part is increased 15%-30% too; The flake-like particles with core-shell is superior to sphere ones, complex permeability of flake-like particles of 20 nm thickness is 4.85-1.71 i, but ones of sphere-like particles of 20 nm thickness is 4.55-1.31 i in 2 GHz; with decreasing the thickness of particle shell, complex permeability of magnetic materials is improved.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2008年第10期9-12,共4页
Electronic Components And Materials
基金
国家自然科学基金资助项目(No.50771047)
湖北省杰出人才基金资助项目(No.2005ABB002)
关键词
电子技术
核壳模型
片状磁性颗粒
复磁导率
复介电常数
反射损耗
electron technology
core-shell model
flake-like magnetic particle
complex permeability
complex permittivity
reflection loss