Comparative Study of the Microwave Propagation Parameters of Some Magnetic Fluids in the Presence of Polarizing Field

Abstract

Three kerosene‐based magnetic fluid samples, denoted A, B and C have been used for measurements. Sample A was a magnetic fluid with mixed ferrite particles of Ni‐Zn type and sample B was a magnetic fluid with mixed ferrite particles of Mn‐Fe type. Sample C was a composite magnetic fluid obtained by mixing a part of sample A with a part of sample B, in a 1/1 ratio. In this paper, the microwave propagation parameters of the initial magnetic fluids (sample A and B) and of the composite magnetic fluid (sample C), are investigated and compared, both in the presence and the absence of the polarizing field. For this, based on dielectric and magnetic measurements in the microwave range (0.6÷3) GHz and in various polarizing magnetic fields, over the range (0–50) kA/m, the frequency and polarizing field dependence of the attenuation parameter (α) and the overall reflection coefficient (Rw) of the magnetic fluid samples were determined.