Title :
On the feasibility of using ferromagnetic materials for thin EM absorbers
Author :
Ramprecht, J. ; Sjoberg, D.
Author_Institution :
R. Inst. of Technol., Stockholm
Abstract :
In this paper the magnetization of a ferro-or ferri-magnetic material has been modeled with the Landau-Lifshitz-Gilbert (LLG) equation. We show that with the aid of a static magnetic bias field the material can be switched between a Lorentz-like material with a resonance frequency and a material exhibiting a magnetic conductivity. The reflection from a magnetic material backed by a perfect electrical conductor (PEC) is then analyzed. It is found that one can achieve low reflection (around -20 dB) for a quite large bandwidth (more than two decades).
Keywords :
electrical conductivity; electromagnetic wave absorption; ferromagnetic materials; magnetic permeability; magnetisation; microwave materials; Landau-Lifshitz-Gilbert equation; Lorentz-like material; ferri-magnetic material; ferro-magnetic material; ferromagnetic materials; magnetic conductivity; magnetization; material exhibiting; perfect electrical conductor; resonance frequency; static magnetic bias field; thin EM absorbers; Conducting materials; Conductivity; Equations; Magnetic analysis; Magnetic materials; Magnetic resonance; Magnetic switching; Magnetization; Reflection; Resonant frequency;
Conference_Titel :
Electromagnetics in Advanced Applications, 2007. ICEAA 2007. International Conference on
Conference_Location :
Torino
Print_ISBN :
978-1-4244-0767-5
Electronic_ISBN :
978-1-4244-0767-5
DOI :
10.1109/ICEAA.2007.4387303
