Incorporation of ferromagnetic metallic films in planar transmission lines for microwave device applications

We constructed a series of microstrip and coplanar microwave waveguides. These structures use metallic ferromagnets and therefore exhibit strongly frequency-dependent attenuation and phase-shift effects. The lines have maximum attenuation peaks occurring at the ferromagnetic resonance frequency, whi...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 37; no. 4; pp. 2392 - 2394
Main Authors Cramer, N., Lucic, D., Walker, D.K., Camley, R.E., Celinski, Z.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.07.2001
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
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Summary:We constructed a series of microstrip and coplanar microwave waveguides. These structures use metallic ferromagnets and therefore exhibit strongly frequency-dependent attenuation and phase-shift effects. The lines have maximum attenuation peaks occurring at the ferromagnetic resonance frequency, which increases with applied magnetic field. Such properties are used in band-stop filters. The devices used monocrystalline Fe films grown by molecular beam epitaxy and polycrystalline sputtered permalloy films. For our devices that incorporated Fe the band-stop frequencies ranged from 10-20 GHz for applied fields up to only 80 kA/m (1000 Oersted). For devices using permalloy, the band-stop frequency was in the 5-10 GHz range for applied fields less than 80 kA/m. The maximum power attenuation was about 100 dB/cm, much larger than the previously reported values of 4 dB/cm. The resonance condition also affects the phase of the transmitted wave, strongly changing phase above and below the resonance frequency. The result is a phase-shifter that is tunable with applied magnetic field. We observed phase changes of over 360/spl deg//cm with an applied field of less than 40 kA/m.
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ISSN:0018-9464
1941-0069
DOI:10.1109/20.951182