Abstract
The effective linewidth technique has been applied to study the microwave response and effective linewidth of iron carbonyl powders. The frequency and Q of a high-Q microwave cavity containing small powder samples was measured over a field range of 0–12 kOe at 10 GHz. The frequency data for high field (9–12 kOe) were used in conjunction with magnetization data and theory to calibrate the microwave system. The calibration parameters were then used in conjunction with the Q data to determine the negative imaginary part of the powder microwave permeability μ″ vs field. The μ″ results at high field were then fitted to theory to estimate the operational effective linewidth parameter for the powders. The procedure provided clear microwave evidence for (1) magnetic saturation of the powders in the expected field range of 7–8 kOe, (2) the operational validity of a model which treats the powder particles as noninteracting spheres, and (3) an off-resonance effective linewidth of about 500 Oe at 10 GHz.
Published Version
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