Microwave specific loss power of magnetic fluids subjected to a static magnetic field |
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Authors: | P C Fannin I Malaescu C N Marin N Stefu |
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Institution: | (1) Department of Electrical Engineering, Trinity College, Dublin 2, Ireland;(2) Faculty of Physics, West University of Timisoara, Bd. V. Parvan no. 4, 300223 Timisoara, Romania |
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Abstract: | This paper reports on the frequency dependence of the magnetic and electric power dissipation in a magnetic fluid sample,
in the microwave frequency range (0.5 to 8GHz), at various values of the static magnetic field (0 to 167.8kA/m). The computation
of the power dissipation relies on the experimental values measured for the complex dielectric permittivity, ɛ = ɛ′ - iɛ″, and the complex magnetic permeability, μ = μ′ - iμ″, over the same frequency range. The results show that the magnetic power dissipation is much larger than the electric one
for the investigated sample. At a specific frequency, f (Hz) , the power dissipation, p, depends on the external magnetic field, and exhibits a maximum. The result obtained suggests the possibility of controlling
the energy absorption in the microwave range by means of the application of an external magnetic field. |
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Keywords: | PACS" target="_blank">PACS 75 50 Mm Magnetic liquids 75 40 Gb Dynamic properties (dynamic susceptibility spin waves spin diffusion dynamic scaling etc ) 77 22 Gm Dielectric loss and relaxation |
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