Title :
Using a 16 GHz interferential reflecto-ellipso-polarimeter to study magnetic composite media
Author :
Sardos, René ; Escarmant, Jean-François ; Ramdani, Youcef ; Balana, Arthur ; Ellison, William J.
Author_Institution :
Bordeaux Univ., Talence,, France
fDate :
3/1/1990 12:00:00 AM
Abstract :
A 16-GHz interferential reflecto-ellipso-polarimeter is described. This apparatus is a combination of a lossy turnstile junction and a three-wave interferometer. One can use it to measure very small variations in the rotation and ellipticity of reflected waves. The device has been used to study waves reflected from a magnetic composite material formed by compression of PVC and ferrite particles, and under the influence of a magnetic field perpendicular to the direction of wave propagation. For ferrite concentrations exceeding 30%, several resonances were observed: they seem to be related to the average distance between the magnetic particles. This contact between the magnetic particles could be called magnetic percolation by analogy with electric percolation
Keywords :
measurement theory; microwave reflectometry; radiowave interferometers; radiowave interferometry; 16 GHz; PVC/ferrite particle composite; SHF; interferential reflecto-ellipso-polarimeter; lossy turnstile junction; magnetic composite media; magnetic field; magnetic percolation; microwave measurement; reflected wave ellipticity measurement; reflected wave rotation measurement; three-wave interferometer; Anisotropic magnetoresistance; Ferrites; Magnetic anisotropy; Magnetic field measurement; Magnetic particles; Magnetic resonance; Perpendicular magnetic anisotropy; Polarization; Rotation measurement; Waveguide junctions;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
