短路微带线法测量微波铁氧体铁磁共振线宽ΔH_ω
发布时间：2019-05-27 05:38
【摘要】：基于传输线理论提出了宽频带测量微波铁氧体铁磁共振线宽的短路微带线法。通过有效参数模型,分析放入样品前后短路微带线单端口网络反射系数S11的变化,进而得到铁磁共振线宽ΔH_ω=Δω/γ,其中Δω为磁导率虚部共振峰的半高宽。设计和制作了短路微带线夹具,并利用所设计的微带夹具测量了钇铁石榴石(YIG)材料的ΔH_ω。最后分析了退磁因子对共振频率的影响,并讨论了样品表面缺陷对ΔH_ω的影响。该方法不仅测量准确度高,操作简单,更解决了低频测量铁磁共振线宽的难点。
[Abstract]:Based on the transmission line theory, a short circuit microstrip method for measuring ferromagnetic resonance linewidth of microwave Ferrite is proposed. Through the effective parameter model, the change of reflection coefficient S11 of short circuit microstrip line single port network before and after putting into the sample is analyzed, and then the ferromagnetic resonance linewidth 螖 H _ 蠅 = 螖 蠅 / 纬 is obtained, where 螖 蠅 is the half height width of the resonance peak in the imaginary part of permeability. The short circuit microstrip fixture was designed and fabricated, and the 螖 H _ 蠅 of yttrium iron garnet (YIG) material was measured by using the designed microstrip fixture. Finally, the effect of demagnetization factor on resonance frequency is analyzed, and the effect of surface defects on 螖 H _ 蠅 is discussed. This method not only has high measurement accuracy and simple operation, but also solves the difficulty of measuring ferromagnetic resonance linewidth at low frequency.
【作者单位】： 华中科技大学光学与电子信息学院;
【分类号】：TM277
本文编号：2485934
[Abstract]:Based on the transmission line theory, a short circuit microstrip method for measuring ferromagnetic resonance linewidth of microwave Ferrite is proposed. Through the effective parameter model, the change of reflection coefficient S11 of short circuit microstrip line single port network before and after putting into the sample is analyzed, and then the ferromagnetic resonance linewidth 螖 H _ 蠅 = 螖 蠅 / 纬 is obtained, where 螖 蠅 is the half height width of the resonance peak in the imaginary part of permeability. The short circuit microstrip fixture was designed and fabricated, and the 螖 H _ 蠅 of yttrium iron garnet (YIG) material was measured by using the designed microstrip fixture. Finally, the effect of demagnetization factor on resonance frequency is analyzed, and the effect of surface defects on 螖 H _ 蠅 is discussed. This method not only has high measurement accuracy and simple operation, but also solves the difficulty of measuring ferromagnetic resonance linewidth at low frequency.
【作者单位】： 华中科技大学光学与电子信息学院;
【分类号】：TM277
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