A technique for measuring the magnetic permeability tensor components and the dielectric constant of microwave ferrites and garnets
| Autor: | K J Standley, B E Storey, R Stevens |
|---|---|
| Rok vydání: | 1971 |
| Předmět: |
Materials science
Condensed matter physics General Engineering General Physics and Astronomy Perturbation (astronomy) Astrophysics::Cosmology and Extragalactic Astrophysics Dielectric Natural resonance law.invention Nuclear magnetic resonance law Permeability (electromagnetism) High Energy Physics::Experiment General Materials Science Astrophysics::Earth and Planetary Astrophysics Crystallite Electron paramagnetic resonance Instrumentation Microwave Circular polarization |
| Zdroj: | Journal of Physics E: Scientific Instruments. 4:111-114 |
| ISSN: | 0022-3735 |
| DOI: | 10.1088/0022-3735/4/2/010 |
| Popis: | The tensor permeability components were determined using circularly polarized microwave radiation, having established maximum allowed sample sizes from a study of the cavity perturbation conditions. It was shown that very slight departures from circular polarization markedly affected the results in the magnetically unsaturated state and electron paramagnetic resonance in a DPPH sample was used to set up the circular polarization very accurately. Examples of the data obtained for polycrystalline YIG at 9.3 GHz are epsilon '=15.2+or-0.3, epsilon "=0.009+or-0.001, mu '=0.91+or-0.02, mu "=0.003+or-0.0008, in zero field. In a field of 100 Oe, kappa '=-0.08+or-0.02 and kappa "=0.002+or-0.0003. The zero field losses are in agreement with calculations based on a natural resonance occurring at a lower frequency due to domain structure. |
| Databáze: | OpenAIRE |
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