131876 20241125101141.0 doi 10.1039/d3na00433c sideral 137184 ART-2023-137184 eng Niraula, Gopal Observation of magnetic vortex configuration in non-stoichiometric Fe3O4 nanospheres 2023 Access copy available to the general public Unrestricted Theoretical and micromagnetic simulation studies of magnetic nanospheres with vortex configurations suggest that such nanostructured materials have technological advantages over conventional nanosystems for applications based on high-power-rate absorption and subsequent emission. However, full experimental evidence of magnetic vortex configurations in spheres of submicrometer size is still lacking. Here, we report the microwave irradiation fabrication of Fe3O4 nanospheres and establish their magnetic vortex configuration based on experimental results, theoretical analysis, and micromagnetic simulations. Detailed magnetic and electrical measurements, together with Mössbauer spectroscopy data, provide evidence of a loss of stoichiometry in vortex nanospheres owing to the presence of a surface oxide layer, defects, and a higher concentration of cation vacancies. The results indicate that the magnetic vortex spin configuration can be established in bulk spherical magnetite materials. This study provides crucial information that can aid the synthesis of magnetic nanospheres with magnetically tailored properties; consequently, they may be promising candidates for future technological applications based on three-dimensional magnetic vortex structures. info:eu-repo/grantAgreement/ES/MICINN/PID2019-106947RB-C21 info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 4.6 2023 MATERIALS SCIENCE, MULTIDISCIPLINARY 141 / 439 = 0.321 2023 Q2 T1 NANOSCIENCE & NANOTECHNOLOGY 60 / 141 = 0.426 2023 Q2 T2 CHEMISTRY, MULTIDISCIPLINARY 69 / 231 = 0.299 2023 Q2 T1 0.953 2023 Atomic and Molecular Physics, and Optics 2023 Q1 Engineering (miscellaneous) 2023 Q1 Materials Science (miscellaneous) 2023 Q1 Chemistry (miscellaneous) 2023 Q1 Bioengineering 2023 Q2 8.0 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Toneto, Denilson Goya, Gerardo F. Universidad de Zaragoza (orcid)0000-0003-1558-9279 Zoppellaro, Giorgio Coaquira, Jose A. H. Muraca, Diego Denardin, Juliano C. Almeida, Trevor P. Knobel, Marcelo Ayesh, Ahmad I. Sharma, Surender K. 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 5, 18 (2023), 5015-5028 Nanoscale Advances 2516-0230 1408250 http://zaguan.unizar.es/record/131876/files/texto_completo.pdf Versión publicada 2795904 http://zaguan.unizar.es/record/131876/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:131876 articulos driver 2024-11-22-12:02:34 ARTICLE