Evanescent Exchange Magnons in a 1D Magnonic Crystal
We investigate the transport properties of propagating and non-propagating exchange modes in a 1D magnonic crystal composed of stacked alternating layers of cobalt (Co) and permalloy (Fe20Ni80). We observe that the exchange magnons excited with energies lying in the energy gap die as soon as the Co layer gets wider.
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The authors thank the European Research Council (ERC Project No. 247062-ASD), the Swedish Research Council (VR), the Knut and Alice Wallenberg Foundation, the Carl Tryggers Foundation, and the Göran Gustafsson Foundation for financial support. L.B. and A.B. also acknowledge SeRC and eSSENCE, respectively. The computer simulations wereperformed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at the National Supercomputer Centre (NSC), UppMAX, and High Performance Computing Center North (HPC2N).
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