Measurement of Dielectric and Magnetic Constants of Ferrofluid-Doped Sol-Gels by a Resonant Cavity Method
B. Mahamout Mahamat
Hubert Curien Laboratory, Jean Monnet University, Saint-Etienne, France and Department of Electrical Engineering, National Institute of Science and Technology of Abeche, Chad.
O. B. Arafat *
Hubert Curien Laboratory, Jean Monnet University, Saint-Etienne, France and Department of Electrical Engineering, National Institute of Science and Technology of Abeche, Chad.
B. Sauviac
Hubert Curien Laboratory, Jean Monnet University, Saint-Etienne, France.
M. F. Blanc-Mignon
Hubert Curien Laboratory, Jean Monnet University, Saint-Etienne, France.
S. Neveu
Phenix Laboratory, University of Sorbone, Paris, France.
D. Vincent
Hubert Curien Laboratory, Jean Monnet University, Saint-Etienne, France.
F. Royer
Hubert Curien Laboratory, Jean Monnet University, Saint-Etienne, France.
*Author to whom correspondence should be addressed.
Abstract
Materials with specific electromagnetic properties are increasingly used for the realization of passive components. Therefore, electromagnetic characterization is a priority to know these materials properties. This study focuses on the electromagnetic characterization of 10 nm maghemite ferrofluid doped sol-gel using a resonant cavity method. We deposited the sol-gel by dipping/removal on an alumina substrate in order to make measurements on the cavity to determine the complex permittivity and permeability. Two studies were carried out; the first consisted in varying the doped sol-gel thickness of layers of the same concentration in the realization of samples; and the second consisted in varying the volume concentration of ferrofluid according to the matrix dimensions. The first study showed that the dielectric constants do not vary with the thickness of the magnetic sol-gel layers. In the second study, measurements also showed that the gyromagnetic resonance is the same for all samples regardless of the ferrofluid volume concentration.
Keywords: Characterization, permittivity, permeability, doped sol-gel, cavity.