Excitation of microwaveguide modes by a stripe antenna

We have studied experimentally the excitation of propagating spin-wave modes of a microscopic Permalloy-film waveguide by a stripe antenna. We show that due to the strong quantization of the spin-wave spectrum, the excitation of particular modes has essentially different frequency dependencies leadi...

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Bibliographic Details
Published in:Applied physics letters 2009-09, Vol.95 (11), p.112509-112509-3
Main Authors: Demidov, Vladislav E., Kostylev, Mikhail P., Rott, Karsten, Krzysteczko, Patryk, Reiss, Guenter, Demokritov, Sergej O.
Format: Article
Language:English
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Summary:We have studied experimentally the excitation of propagating spin-wave modes of a microscopic Permalloy-film waveguide by a stripe antenna. We show that due to the strong quantization of the spin-wave spectrum, the excitation of particular modes has essentially different frequency dependencies leading to a nonmonotonous variation of the modulation depth of the resulting spin-wave beam as a function of the excitation frequency. In addition, we address the effect of nonreciprocity of spin-wave excitation and found that for the case of Permalloy microwaveguides this effect is much weaker pronounced than for waveguides made from dielectric magnetic films with low saturation magnetization.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3231875