Abstract

We have investigated experimentally the reflection of an electromagnetic (EM) wave in the microwave range at a frequency of 10.65 GHz from a layer of a magnetic fluid (magnetic colloid) and composites synthesized on its basis. It is found that, upon an increase in the solid-phase concentration, the conditions for the emergence of ferromagnetic resonance in the homogeneous magnetic colloid change. We have revealed peculiarities of reflection of an EM wave from the magnetic emulsion layer under the action of magnetic fields with a strength much smaller than that corresponding to the ferromagnetic resonance condition. The modulus of the coefficient of reflection from a five-layer system containing the magnetic emulsion has been calculated theoretically and compared with experimental values. In the same range of field strengths, we have investigated the reflection of an EM wave from the composite of a magnetic fluid and micrometer-size nonmagnetic bronze particles.

中文翻译：

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电磁胶体在微波范围内反射电磁波的特殊性

摘要

我们已经实验研究了电磁波（EM）在微波范围内从磁性流体（磁性胶体）层和在其基础上合成的复合材料层在10.65 GHz频率下的反射。已经发现，随着固相浓度的增加，在均匀磁性胶体中出现铁磁共振的条件发生了变化。我们已经揭示了在磁场作用下电磁波从磁性乳剂层的反射特性，其强度远小于对应于铁磁共振条件的强度。从理论上计算了包含磁性乳剂的五层系统的反射系数模量，并将其与实验值进行了比较。在相同的场强范围内