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PIER PIER B PIER C PIER M PIER Letters
2008-06-16
Scattering from a Thin Magnetic Layer with a Periodic Lateral Magnetization: Application to Electromagnetic Absorbers
By
Jörgen Ramprecht,

    Mr. Jörgen Ramprecht

    School of Electronic Engineering

    Royal Institute of Technology

    Sweden

    Homepage

Martin Norgren,

    Dr. Martin Norgren

    Alfven Laboratory

    Sweden

    Homepage

Daniel Sjöberg

    Dr. Daniel Sjöberg

    Department of Electrical and Information Technology

    Lund University

    Sweden

    Homepage

Progress In Electromagnetics Research, Vol. 83, 199-224, 2008
doi:10.2528/PIER08042805
Abstract
A magnetized thin layer mounted on a PEC surface is considered as an alternative for an absorbing layer. The magnetic material is modeled with the Landau-Lifshitz-Gilbert equation, with a lateral static magnetization having a periodic variation along one lateral direction. The scattering problem is solved by means of an expansion into Floquet-modes, a propagator formalism and wavesplitting. Numerical results are presented, and for parameter values close to the typical values for ferro- or ferrimagnetic media, reflection coefficients below -20 dB can be achieved for the fundamental mode over the frequency range 1-4 GHz, for both polarizations. It is found that the periodicity of the medium makes the reflection properties for the fundamental mode almost independent of the azimuthal direction of incidence, for both normally and obliquely incident waves.
Citation
Jörgen Ramprecht, Martin Norgren, and Daniel Sjöberg, "Scattering from a Thin Magnetic Layer with a Periodic Lateral Magnetization: Application to Electromagnetic Absorbers," Progress In Electromagnetics Research, Vol. 83, 199-224, 2008.
doi:10.2528/PIER08042805
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