Analysis of radio-frequency absorption and electric and magnetic field enhancements due to surface roughness

Zhang, Peng; Lau, Y. Y.; Gilgenbach, R. M.

doi:doi:10.1063/1.3131844

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Changing the three-dimensional magnetization exchange coupling of mixed Fe and V nanoclusters with hydrogen

The magneto-optical Kerr effect of an iron-vanadium nanocluster-assembled thin film was measured as a function of hydrogen content. Hydrogen has a clear effect on the magnetization of this three-dimensional exchange coupled system for both increasing and decreasing hydrogen pressures. This effect is attributed to the modification of the electronic properties of the nonmagnetic vanadium nanoclusters by hydrogen. Since vanadium mediates the exchange coupling between aggregated iron nanoclusters, ...

Effects of compressional waves on the response of quartz crystal microbalance in contact with silicone oil droplets

Droplet quartz crystal microbalance has been demonstrated to be a promising tool for accessing material properties of fluids as well as the diverse solid-fluid interface phenomena. However, a microliter droplet localized on the surface of the electrodes of finite lateral size may cause a nonuniform distribution of the plane velocity, which may lead to surface normal fluid flow and generate the compressional waves above the crystal surface. In the present article, we report systematical investig...

The radio-frequency (rf) power absorption due to a small hemispherical protrusion on a resonant cavity’s surface is computed analytically. This protrusion may assume arbitrary values of permittivity, permeability, and conductivity so that it may represent a foreign object. Under the assumption that the protrusion radius, a, is small compared with the rf wavelength, the power dissipated in the protrusion by the rf electric field and by the rf magnetic field are calculated explicitly. It is found that, in general, the heating by the rf magnetic field is dominant when δ/a<1, even for nonmagnetic materials, where δ is the skin depth associated with the protrusion material. The field enhancement factors for both the rf electric field and the rf magnetic field on the protrusion are also calculated analytically. They are found to decrease as δ/a increases. They are spot checked against the MAXWELL 3D code. These field enhancement factors are also consistent with the published results in the δ = 0 limit, in which case the protrusion may represent a small local bump on the surface of a superconducting cavity.

Article Outline

INTRODUCTION
THE MODEL
rf POWER ABSORPTION
rf FIELD ENHANCEMENTS
1. rf electric field enhancement
2. rf magnetic field enhancement
CONCLUDING REMARKS

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KEYWORDS and PACS

Keywords

cavity resonators, electrical conductivity, Maxwell equations, permittivity, radiofrequency spectra, surface roughness

PACS

78.70.Gq

Microwave and radio-frequency interactions
03.50.De

Classical electromagnetism, Maxwell equations
77.22.Ch

Permittivity (dielectric function)
68.35.bt

Other materials

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http://link.aip.org/link/doi/10.1063/1.3131844

PUBLICATION DATA

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0021-8979 (print)

1089-7550 (online)

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American Institute of Physics

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