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Retardation Effects Caused by Ferrite Sample Size on the Frequency Shift of a Resonant Cavity

机译：铁氧体样品尺寸对共振腔频移的延迟影响

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摘要

Using perturbation theory, expressions are derived for the frequency shift of a circularly polarized resonant microwave cavity upon insertion of a ferrite sample small compared with the wavelength. Retardation effects are considered in deriving the rf field h2 internal to the sample. By integrating h1·h2dv (where h1 is the applied rf field) over the sample volume, a closed‐form expression is obtained for the cavity frequency shift. The theory is applied to the magnetic resonance in ferrites. The calculated magnetic resonance line shape is found to remain symmetrical as the sample size is increased. Retardation effect, thus, does not explain the asymmetry of the resonance lines which have been observed for polycrystalline ferrite. Results of the theory are also compared with measurements on a single crystal of ferrite having the rather large maximum permeability loss term of 100. Theoretical and measured values are in close agreement. The theory is also compared with the somewhat different results of other recent theoretical treatments, in which an approximate expression for an effective magnetic dipole moment for the sample was computed, rather than integrating the internal rf fields over the volume of the sample.
机译：利用微扰理论，推导了插入与波长相比较小的铁氧体样品时圆极化谐振微波腔的频移表达式。在推导样本内部的rf场h2时要考虑延迟效应。通过在样品体积上积分h1·h2dv（其中h1是施加的rf场），可以得到腔频移的闭式表达式。该理论适用于铁氧体的磁共振。发现所计算的磁共振线形状随着样本大小的增加而保持对称。因此，延迟效应不能解释多晶铁氧体所观察到的共振线的不对称性。还将理论结果与最大磁导率损耗项为100的较大铁氧体单晶的测量结果进行了比较。理论值和测量值非常吻合。还将该理论与其他最近的理论处理的结果有所不同，在其他理论处理中，计算了样品有效磁偶极矩的近似表达式，而不是对样品内部的rf场进行积分。

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  • 来源
    《Journal of Applied Physics》 |1957年第9期|共6页
  • 作者

    Tompkins J. E.; Spencer E. G.;

  • 作者单位

    Diamond Ordnance Fuze Laboratories, Washington 25, D. C.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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