NDLI: Measurement of dielectric and magnetic properties of ferromagnetic materials at microwave frequencies

Content Provider	IEEE Xplore Digital Library
Author	Von Aulock, Wilhelm Rowen, John H.
Copyright Year	1922
Description	Some experimental techniques are discussed which permit measurement of the magnetic and dielectric properties of ferrite materials in the microwave region by observing the perturbation in a cylindrical cavity due to insertion of a small ferrite sample. A comparison of the properties of thin disc samples with those of small spheres shows that discs yield more accurate results in the region below ferromagnetic resonance whereas spheres are preferable for the study of ferrite properties near resonance. A short description of instrumentation for cavity measurements at 9,200 mc is given and experimental results of disc measurements are reported for a low-loss BTL ferrite and several disc diameters. A comparison of experimental results with Polder's theory indicates that the loss of polycrystalline ferrites below resonance is considerably lower than that predicted from an evaluation of the width of the resonance absorption line.
Starting Page	427
Ending Page	448
Page Count	22
File Size	7813108
File Format	PDF
ISSN	00058580
Volume Number	36
Issue Number	2
Language	English
Publisher	American Telephone and Telegraph Company (AT&T)
Publisher Date	1957-01-01
Access Restriction	Subscribed
Rights Holder	Bell Labs
Content Type	Text
Resource Type	Article
Subject	Engineering

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Measurement of dielectric and magnetic properties of ferromagnetic materials at microwave frequencies