Eur. Phys. J. E (2008) 27: 145-148
https://doi.org/10.1140/epje/i2008-10362-y

Regular Article

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

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

^* e-mail: snico@physics.uvt.ro

Received: 22 April 2008
Accepted: 25 July 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.