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Frequency Stability of the Initial Permeability of MnZn-Ferrites

机译:MnZn铁氧体初始磁导率的频率稳定性

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The frequency stability of the initial permeability of MnZn-ferrites is limited by the gyromagnetic resonance (Snoek's law). However, in polycrystalline systems, for the same initial permeability, different levels of frequency stability can be achieved. Main tailoring parameters are composition, grain size, high resistivity doping phases along the grain boundaries, and the extent of dopant segregation. Model experiments were performed to quantify the effect of each parameter. In order to explain the results and to account for the permeability dependency on the specific resistivity, a modification of the nonmagnetic grain boundary (NMGB) model is proposed to a less magnetic grain boundary (LMGB) model, where not the thickness but the initial permeability of the grain boundary layer is the main variable that is affected by the process parameters.
机译:MnZn铁氧体的初始磁导率的频率稳定性受到回旋共振的限制(斯诺克定律)。但是,在多晶系统中,对于相同的初始磁导率,可以实现不同级别的频率稳定性。主要的调整参数是成分,晶粒尺寸,沿晶界的高电阻率掺杂相以及掺杂剂偏析的程度。进行模型实验以量化每个参数的影响。为了解释结果并解释磁导率对电阻率的依赖性,建议将非磁性晶界(NMGB)模型修改为较小磁晶界(LMGB)模型,该模型不是厚度而是初始磁导率晶界层的厚度是受工艺参数影响的主要变量。

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