Observation of magnetic vortex configuration in non-stoichiometric Fe3O4 nanospheres

Niraula, Gopal ; Toneto, Denilson ; Goya, Gerardo F. (Universidad de Zaragoza) ; Zoppellaro, Giorgio ; Coaquira, Jose A. H. ; Muraca, Diego ; Denardin, Juliano C. ; Almeida, Trevor P. ; Knobel, Marcelo ; Ayesh, Ahmad I. ; Sharma, Surender K.

Resumen: 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.

Idioma: Inglés

DOI: 10.1039/d3na00433c

Año: 2023

Publicado en: Nanoscale Advances 5, 18 (2023), 5015-5028
ISSN: 2516-0230

Factor impacto JCR: 4.6 (2023)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 141 / 439 = 0.321 (2023) - Q2 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 60 / 141 = 0.426 (2023) - Q2 - T2
Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 69 / 231 = 0.299 (2023) - Q2 - T1

Factor impacto CITESCORE: 8.0 - Atomic and Molecular Physics, and Optics (Q1) - Engineering (all) (Q1) - Chemistry (all) (Q1) - Materials Science (all) (Q1) - Bioengineering (Q2)

Factor impacto SCIMAGO: 0.953 - Atomic and Molecular Physics, and Optics (Q1) - Engineering (miscellaneous) (Q1) - Materials Science (miscellaneous) (Q1) - Chemistry (miscellaneous) (Q1) - Bioengineering (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2019-106947RB-C21

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)