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Sandiumenge, Felip
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Publications (6/6 displayed)
- 2023Antisite Defects and Chemical Expansion in Low‐damping, High‐magnetization Yttrium Iron Garnet Filmscitations
- 2022Antisite Defects and Chemical Expansion in Low-damping, High-magnetization Yttrium Iron Garnet Filmscitations
- 2021Strong strain gradients and phase coexistence at the metal-insulator transition in VO2 epitaxial filmscitations
- 2019Nonstoichiometry Driven Ferromagnetism in Double Perovskite La2Ni1−xMn1+xO6 Insulating Thin Films
- 2014Nanoscale magnetic structure and properties of solution-derived self-assembled La0.7Sr0.3MnO3 islandscitations
- 2013Magnetic structure of epitaxial self-assembled La0.7Sr0.3MnO3 nanoislands
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article
Antisite Defects and Chemical Expansion in Low‐damping, High‐magnetization Yttrium Iron Garnet Films
Abstract
<jats:title>Abstract</jats:title><jats:p>Yttrium iron garnet is widely investigated for its suitability in applications ranging from magneto‐optical and microwave devices to magnonics. However, in the few‐nanometer thickness range, epitaxial films exhibit a strong variability in magnetic behavior that hinders their implementation in technological devices. Here, direct visualization and spectroscopy of the atomic structure of a nominally stoichiometric thin film, exhibiting a small damping factor of 3.0 ⋅ 10<jats:sup>−4</jats:sup>, reveals the occurrence of Y‐excess octahedral antisite defects. The two‐magnon strength is very small, <jats:italic>Γ<jats:sub>0</jats:sub></jats:italic>≈10<jats:sup>−6</jats:sup> <jats:italic>Oe</jats:italic>, indicating a very low occurrence of scattering centers. Notably, the saturation magnetization, 4π<jats:italic>M<jats:sub>s</jats:sub></jats:italic>=2.10 (±0.01) kOe, is higher than the bulk value, in consistency with the suppression of magnetic moment in the minority octahedral sublattice by the observed antisite defects. Analysis of elemental concentration profiles across the substrate‐film interface suggests that the Y‐excess is originated from unbalanced cationic interdiffusion during the early growth stages.</jats:p>