161778 20251017144618.0 doi 10.1002/adfm.202503644 sideral 144467 ART-2025-144467 eng Legrand, William Lattice-Tunable Substituted Iron Garnets for Low-Temperature Magnonics 2025 The synthesis of nm-thick epitaxial films of iron garnets by physical vapor deposition has opened up exciting opportunities for the on-chip generation and processing of microwave signals encoded in magnons. However, iron garnet thin films suffer from demanding lattice-matching and stoichiometry requirements. Here a new approach to their synthesis is developed, enabling a precise and continuous tuning of iron garnet compositions based on the co-sputtering of binary oxides. By substituting a controlled proportion of iron with additional yttrium, Y3(YxFe5−x)O12 films of high crystalline quality are obtained, combining a widely tunable lattice parameter and excellent magnetization dynamics. This enables iron garnet thin films suited for cryogenic applications, which have long remained impractical due to microwave losses caused by paramagnetic garnet substrates. Low-temperature ferromagnetic resonance confirms the elimination of substrate paramagnetic losses for Y3(YxFe5−x)O12 films lattice-matched to Y3Sc2Ga3O12 (YSGG), a diamagnetic substrate. The Y3(YxFe5−x)O12 system can be matched to other substrates such as (Gd, Y)3Sc2Ga3O12. Bi-substituted films of (Bi0.8Y2.2)Fe5O12 also have ideal lattice matching to YSGG, demonstrating the versatility of this approach. This opens unprecedented options for cation substitutions in iron garnet films, offering a promising avenue to new properties and quantum magnonic devices operating in low-temperature environments. info:eu-repo/grantAgreement/EC/H2020/101007825/EU/ULtra ThIn MAgneto Thermal sEnsor-Ing/ULTIMATE-I This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101007825-ULTIMATE-I info:eu-repo/grantAgreement/EC/H2020/872631 /EU/Memristive and multiferroic materials for emergent logic units in nanoelectronics/MELON This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 872631 -MELON info:eu-repo/semantics/closedAccess All rights reserved http://www.europeana.eu/rights/rr-f/ info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Kemna, Yana Schären, Stefan Wang, Hanchen Petrosyan, Davit Holder, Luise Schlitz, Richard Aguirre, Myriam H. Universidad de Zaragoza (orcid)0000-0002-1296-4793 Lammel, Michaela Gambardella, Pietro 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada (2025), 2503644 [16 pp.] Adv. funct. mater. Advanced Functional Materials 1616-301X Dataset for "Lattice-Tunable Substituted Iron Garnets for Low-Temperature Magnonics" https://www.research-collection.ethz.ch/handle/20.500.11850/739804 4559958 http://zaguan.unizar.es/record/161778/files/texto_completo.pdf Versión publicada 2426193 http://zaguan.unizar.es/record/161778/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:161778 articulos driver 2025-10-17-14:20:39 ARTICLE