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The main features of these crystals are the presence of band gaps in the spin-wave spectra, usually formed due to Bragg reflections of spin-waves on the artificially created periodic structures. Here, we study spin-wave propagation in longitudinally magnetized width- and thickness-modulated yttrium iron garnet waveguides by means of Brillouin light scattering and microwave spectroscopy techniques. It is found that the width modulated crystal does not manifest noticeable Bragg reflections, but still demonstrates a pronounced band gap in its transmission characteristic. The phenomenon can be explained by the destructive interference between different frequency-degenerated spin-wave modes excited by the crystal. Such a reflection-less crystal is promising for future design of multi-element magnonic devices.<\/jats:p>","DOI":"10.1038\/s42005-020-0281-y","type":"journal-article","created":{"date-parts":[[2020,1,22]],"date-time":"2020-01-22T11:04:44Z","timestamp":1579691084000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":54,"title":["Reflection-less width-modulated magnonic crystal"],"prefix":"10.1038","volume":"3","author":[{"given":"Pascal","family":"Frey","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6372-3220","authenticated-orcid":false,"given":"Aleksei A.","family":"Nikitin","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0215-4903","authenticated-orcid":false,"given":"Dmytro A.","family":"Bozhko","sequence":"additional","affiliation":[]},{"given":"Sergey A.","family":"Bunyaev","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7081-581X","authenticated-orcid":false,"given":"Gleb N.","family":"Kakazei","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7382-9210","authenticated-orcid":false,"given":"Alexey B.","family":"Ustinov","sequence":"additional","affiliation":[]},{"given":"Boris A.","family":"Kalinikos","sequence":"additional","affiliation":[]},{"given":"Florin","family":"Ciubotaru","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5515-0848","authenticated-orcid":false,"given":"Andrii V.","family":"Chumak","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5049-629X","authenticated-orcid":false,"given":"Qi","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Vasyl S.","family":"Tiberkevich","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8910-0355","authenticated-orcid":false,"given":"Burkard","family":"Hillebrands","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2634-8569","authenticated-orcid":false,"given":"Alexander A.","family":"Serga","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,1,22]]},"reference":[{"key":"281_CR1","doi-asserted-by":"publisher","first-page":"264001","DOI":"10.1088\/0022-3727\/43\/26\/264001","volume":"43","author":"VV Kruglyak","year":"2010","unstructured":"Kruglyak, V. 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