The European Physical Journal E (EPJ E)

Eur. Phys. J. E 27, 145-148 (2008)
DOI: 10.1140/epje/i2008-10362-y

Microwave specific loss power of magnetic fluids subjected to a static magnetic field

P. C. Fannin¹, I. Malaescu², C. N. Marin² and N. Stefu²

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

snico@physics.uvt.ro

Received 22 April 2008 / Published online 9 September 2008

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.

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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