Date of Award

5-1-1993

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics & Astrophysics

Abstract

A new apparatus was built to study the transmission properties of microwaves through ferromagnetic metals. Experiments were done at room temperature with samples of Metglas* 2605SC 22 /xm thick and the results were compared with the theoretical model. The microwaves were generated by a dielectric resonant oscillator and coupled into an (input) cavity which was tuned to resonate at 16.95 GHz. The specimen was part of the common wall between two identical resonant cavities, the second cavity being the receiver. The sample-field configuration was chosen in such a way that the static and the microwave magnetic field were perpendicular to each other but both were parallel to the sample surface.

To study the field dependence of the transmitted signal, the power ratio (transmitted power/incident power) was measured. The ferromagnetic resonance field was observed to be * 2.2 kG. Theoretical expressions for the wave propagation constants and for the wave amplitudes were obtained. Magnetoelastic coupling was responsible for the sound wave.

Included is a description of the apparatus, especially the cavities, the sample holders, and the magnet, as well as the material Metglas* 2605SC.

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