Quantifying the complex permittivity and permeability of magnetic nanoparticles
Quantifying the complex permittivity and permeability of magnetic nanoparticles
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DOI：
10.1063/1.4917505
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
B. Yao;Y. Gui;M. Worden;T. Hegmann;M. Xing;X. Chen;W. Lu;Y. Wroczynskyj;J. Lierop;C.-M. Hu
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文献类型：
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作者：
B. Yao;Y. Gui;M. Worden;T. Hegmann;M. Xing;X. Chen;W. Lu;Y. Wroczynskyj;J. Lierop;C.-M. Hu
超顺磁性氧化铁纳米颗粒的复介电常数和磁导率已经使用具有静磁场的圆形波导组件来量化，以对齐纳米颗粒的磁化。测量的高灵敏度提供了纳米颗粒的精确共振特征。在铁磁共振（FMR）附近的复磁导率与通过常规磁力测量法测量的纳米颗粒的磁化强度一致。一个严格的和自洽的测量纳米粒子的复介电常数和磁导率是至关重要的，以准确地确定介电行为以及纳米粒子磁化的频率响应，必要的成分时，设计和优化磁性纳米粒子的生物医学应用。
The complex permittivity and permeability of superparamagnetic iron-oxide nanoparticles has been quantified using a circular waveguide assembly with a static magnetic field to align the nanoparticle's magnetization. The high sensitivity of the measurement provides the precise resonant feature of nanoparticles. The complex permeability in the vicinity of ferromagnetic resonance (FMR) is in agreement with the nanoparticle's measured magnetization via conventional magnetometry. A rigorous and self-consistent measure of complex permittivities and permeabilities of nanoparticles is crucial to ascertain accurately the dielectric behaviour as well as the frequency response of nanoparticle magnetization, necessary ingredients when designing and optimizing magnetic nanoparticles for biomedical applications.