DocumentCode :
916875
Title :
Coupling of Circuit Structures to Magnetostatic Modes of Ferromagnetic Resonators
Author :
Moll, Nicolas J.
Volume :
25
Issue :
11
fYear :
1977
fDate :
11/1/1977 12:00:00 AM
Firstpage :
933
Lastpage :
938
Abstract :
The coupling between a current-carrying circuit structure and the magnetostatic modes of a general ferromagnet, such as a YIG resonator, is examined. A small-signal theory is presented that describes the excitation of an arbitrary mode in terms of an effective susceptibility matrix; this description leads to a simple method for calculating the z parameters of the resonator and coupling structure combination. This result is tested by comparison with other theory and with experiment. Applied to the case of a uniform field exciting the uniform mode of an ellipsoidal resonator, it reduces to Carter´s well-known formula. Applied to the case of a particular nonuniform field exciting the main mode of a thin square resonator, it predicts the experimental finding that the coupling strength depends only on the resonator´s thickness. This last case illustrates the extended generality of our result which allows the treatment of situations where the RF magnetization and field are not uniform.
Keywords :
Anisotropic magnetoresistance; Coupling circuits; Magnetic anisotropy; Magnetic circuits; Magnetic fields; Magnetic resonance; Magnetostatics; Perpendicular magnetic anisotropy; Radio frequency; Saturation magnetization;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.1977.1129244
Filename :
1129244
Link To Document :
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