Antisite Defects and Chemical Expansion in Low-damping, High-magnetization Yttrium Iron Garnet Films
Santiso, José (Institut Català de Nanociència i Nanotecnologia)
García, Carlos (Universidad Técnica Federico Santa María)
Romanque, Cristian (Universidad Técnica Federico Santa María)
Henry, Loïc (Université Grenoble Alpes)
Bernier, Nicolas (Université Grenoble Alpes)
Bagués Salgueró, Núria (The Ohio State University)
Caicedo Roque, Jose Manuel (Institut Català de Nanociència i Nanotecnologia)
Valvidares, Manuel (ALBA Laboratori de Llum de Sincrotró)
Sandiumenge Ortiz, Felip (Institut de Ciència de Materials de Barcelona)

Date:	2023
Abstract:	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, reveals the occurrence of Y-excess octahedral antisite defects. The two-magnon strength is very small, Γ≈10 Oe, indicating a very low occurrence of scattering centers. Notably, the saturation magnetization, 4πM=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.
Grants:	Agencia Estatal de Investigación PID2019-108573GB-C21 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-579 Ministerio de Economía, Industria y Competitividad SEV-2017-0706 Ministerio de Ciencia e Innovación CEX2019-000917-S European Commission 101007825 Agencia Estatal de Investigación PID2020-116181RB-C32 Agencia Estatal de Investigación RTI2018-098537-B-C21
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	ChemNanoMat, Vol. 9, Issue 2 (February 2023) , art. e202200495, ISSN 2199-692X

DOI: 10.1002/cnma.202200495

9 p, 1.4 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > The ALBA Synchrotron
Articles > Research articles
Articles > Published articles