短路微帶線法測量微波鐵氧體鐵磁共振線寬ΔH_ω
發(fā)布時(shí)間:2019-05-27 05:38
【摘要】:基于傳輸線理論提出了寬頻帶測量微波鐵氧體鐵磁共振線寬的短路微帶線法。通過有效參數(shù)模型,分析放入樣品前后短路微帶線單端口網(wǎng)絡(luò)反射系數(shù)S11的變化,進(jìn)而得到鐵磁共振線寬ΔH_ω=Δω/γ,其中Δω為磁導(dǎo)率虛部共振峰的半高寬。設(shè)計(jì)和制作了短路微帶線夾具,并利用所設(shè)計(jì)的微帶夾具測量了釔鐵石榴石(YIG)材料的ΔH_ω。最后分析了退磁因子對共振頻率的影響,并討論了樣品表面缺陷對ΔH_ω的影響。該方法不僅測量準(zhǔn)確度高,操作簡單,更解決了低頻測量鐵磁共振線寬的難點(diǎn)。
[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 / 緯 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.
【作者單位】: 華中科技大學(xué)光學(xué)與電子信息學(xué)院;
【分類號】:TM277
本文編號: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 / 緯 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.
【作者單位】: 華中科技大學(xué)光學(xué)與電子信息學(xué)院;
【分類號】:TM277
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