Eur. Phys. J. E (2009) 29: 299-303
https://doi.org/10.1140/epje/i2009-10477-7

Regular Article

Microwave propagation parameters in magnetic fluids

¹ Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland
² Faculty of Physics, Department of Electricity and Magnetism, West University of Timisoara, Bd. V. Parvan 4, Timisoara, Romania

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

Received: 28 January 2009
Revised: 28 May 2009
Accepted: 8 June 2009
Published online: 16 July 2009

Abstract

Complex dielectric permittivity and complex magnetic permeability measurements of two magnetic fluids (as microwave propagation media), in the approximate range 0.2-5GHz were performed. The two samples consisted of magnetite nanoparticles, dispersed in kerosene and in water, respectively. Based on the dielectric and magnetic measurements, the frequency (f ) dependence of the attenuation parameter, , the phase constant, , the propagation constant, , the intrinsic impedance, Z_m, the refractive index, n , the reflection coefficient, R , the wavelength, and the skin depth, , of the investigated samples were determined.