毫米波铁氧体粉末复介电常数和磁导率的测量

2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Pub Date : 2013-05-06 DOI:10.1109/I2MTC.2013.6555677

L. Chao, M. Afsar

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引用次数: 0

摘要

钡和锶铁氧体由于其六角形结构在毫米波下表现出很强的磁各向异性。在毫米波频率范围内对不同粒径的钡、锶铁氧体粉末进行了测量。采用高功率后向振荡器驱动的准光学光谱仪测量了粉末样品的透射率。铁磁共振是由透射光谱确定的。对于纳米级粉体，透光率的变化幅度更小、更明显。透射光谱的倾角或最小值本质上是共振峰移动到较低的频率。这主要是由于域大小的减小。分析了介电常数和磁导率计算中可能出现的误差。

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Complex dielectric permittivity and magnetic permeability measurement of ferrite powders at millimeter wavelength

Barium and Strontium Ferrites exhibit strong magnetic anisotropy at millimeter waves due to their hexagonal configuration. Barium and Strontium Ferrite powders with different particle diameter are measured in millimeter wave frequency range. A Quasi-optical spectrometer in transmission mode powered by high power backward oscillator is employed to measure the transmittance of these powder samples. The ferromagnetic resonance is determined from the transmittance spectra. For the nano-size powders the dip in the transmittance becomes weaker and sharper. The dip or the minimum in transmittance spectrum which is essentially the resonance peak moves to lower frequency. It is mainly due to the decrease in domain size. Possible errors in the evaluation of permittivity and permeability are analyzed.

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2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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