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Surface impedance of transversely moving microwave ferrite
Author(s) -
Mueller R. S.
Publication year - 1990
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs025i001p00019
Subject(s) - electrical impedance , ferrite (magnet) , amplitude , wave impedance , microwave , materials science , electromagnetic radiation , transverse plane , physics , optics , nuclear magnetic resonance , composite material , structural engineering , quantum mechanics , engineering
A theoretical study was made of the surface impedance Z for an electromagnetic transverse magnetic wave from free space on a magnetized ferrite surface moving normal to the plane of incidence. It was found convenient to decompose the surface impedance into two transfer impedances, Z 1 and Z 2 , which relate the hybrid reflected amplitudes to the amplitude of the incident wave. The surface impedance does not vary much with respect to the angle of incidence, so only the case of normal incidence (θ i = 0°) was evaluated. Resonant poles at ƒ c , [ƒ c (ƒ c + ƒ m )] 1/2 , and ƒ c + ƒ m dominate the frequency characteristics of Z 1 and Z 2 . The frequencies ƒ c andƒ m are the precessional frequency and magnetization frequency, respectively.