Excitation of microwaveguide modes by a stripe antenna

Demidov, Vladislav E.; Kostylev, Mikhail P.; Rott, Karsten; Krzysteczko, Patryk; Reiss, Guenter; Demokritov, Sergej O.
September 2009
Applied Physics Letters;9/14/2009, Vol. 95 Issue 11, p112509
Academic Journal
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.


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