Title :
Microwave properties of diluted composites made of magnetic wires with giant magneto-impedance effect
Author :
Acher, O. ; Ledieu, M. ; Adenot, A.-L. ; Reynet, O.
Author_Institution :
CEA Le Ripault, Monts, France
Abstract :
Free space permittivity measurements are presented on lattices of magnetic microwires . It is shown that the magnetic properties strongly affect the dielectric response of the composite. A model is presented, that accounts for these observations. The microwave dielectric function is shown to depend on the microwave impedance of the wire. Previous works on giant magneto impedance have provided a strong theoretical and experimental background, that may now be used to design composites with complex dielectric response, and also tuneable response. Some principles for making tuneable composites are presented, and illustrated by experimental results.
Keywords :
composite materials; dielectric function; ferromagnetic materials; giant magnetoresistance; microwave materials; permittivity; FeCoSiB; FeCoSiB wires; amorphous glass-coated ferromagnetic microwires; complex dielectric response; dielectric response; diluted composites; ferromagnetic composites; free space permittivity measurements; giant magneto-impedance effect; magnetic microwire lattices; magnetic properties; magnetic wires; microwave dielectric function; microwave impedance; microwave properties; tuneable response; Conducting materials; Dielectrics; Impedance; Magnetic fields; Magnetic materials; Magnetic properties; Magnetosphere; Permeability; Permittivity; Wires;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816011
