Shielding of the electromagnetic field of a coplanar waveguide by a metal film: Implications for broadband ferromagnetic resonance measurements | Zendy

Matthieu Bailleul | Zendy

Open Access

Shielding of the electromagnetic field of a coplanar waveguide by a metal film: Implications for broadband ferromagnetic resonance measurements

Author(s) -

Matthieu Bailleul

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4829367

Subject(s) - coplanar waveguide , electromagnetic shielding , ferromagnetic resonance , microwave , materials science , waveguide , electromagnetic radiation , condensed matter physics , electromagnetic field , resonance (particle physics) , transmission line , magnetic field , electrical impedance , wave impedance , optoelectronics , optics , physics , electrical engineering , atomic physics , composite material , engineering , magnetization , quantum mechanics

We show that the propagation of microwave fields along a planar transmission line is strongly modified when a conducting film is brought close to it. The effect is attributed to the shielding of the electrical and/or magnetic microwave fields which is shown to occur over a wide range of parameters (microwave frequency, film square resistance, transverse dimensions of the waveguide). This is illustrated by finite-element electromagnetic simulations and interpreted using a distributed impedance model. We discuss the implications of this phenomenon for broadband measurements of ferromagnetic resonance realized by placing a ferromagnetic metal film above a coplanar waveguide.

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