2026-04-14T03:11:50Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2221212025-12-04T21:41:57Zcom_2072_1057col_2072_478917col_2072_478933

X-ray spectromicroscopy of single NiOantiferromagnetic nanoparticles Figueroa Garcia, Adriana Isabel Moya Álvarez, Carlos Aribó, M. X. Ara Escario, Jorge García del Muro y Solans, Montserrat Kleibert, Armin Valencia, Sergio Labarta, Amílcar Batlle Gelabert, Xavier Fraile Rodríguez, Arantxa Nanopartícules Espectroscòpia de raigs X Nanoparticles X-ray spectroscopy The chemical and magnetic properties of NiO nanoparticles (NP) have been studied with single-particle sen-sitivity by means of synchrotron-based, polarization-dependent X-ray absorption spectroscopy using photoemis-sion electron microscopy around the Ni L3,2 edges. Three samples of NP in a size range of 40-120 nm were syn-thesized by thermal decomposition and subsequent calcination processes. The analysis of the local X-ray absorption spectra of tens of individual NP indicates a strong dependence of their Ni oxidation state with the cal-cination protocol of each sample. Additional electron-microscopy-based images and spectra of a few individual NP as well as other standard macroscopic data are in very good agreement with these experimental findings. These results showcase the relevance of combining standard and advanced single-particle studies to gain further insight into the understanding and control of electronic and magnetic phenomena at the nanoscale. 2025-07-09T12:14:59Z 2025-07-09T12:14:59Z 2024-10-01 2025-07-09T12:14:59Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Versió postprint del document publicat a: https://doi.org/10.1063/10.0028630 Low Temperature Physics, 2024, vol. 50, num.10, p. 852-861 https://doi.org/10.1063/10.0028630 (c) AIP Publishing, 2024 info:eu-repo/semantics/openAccess AIP Publishing Articles publicats en revistes (Química Inorgànica i Orgànica)