RT info:eu-repo/semantics/article
T1 Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles
A1 Hernández Gómez, Pablo
A1 Almeida Valente, Manuel
A1 Fernandes Graça, Manuel Pedro
A1 Muñoz Muñoz, José María
K1 Magnetic materials
K1 Materiales magnéticos
K1 Nanostructured materials
K1 Materiales nanoestructurados
K1 Oxid materials
K1 Materiales de óxido
K1 Sol-gel processes
K1 Procesos sol-gel
K1 Ferromagnetic resonance
K1 Resonancia ferromagnética
K1 2202.08 Magnetismo
AB Lithium ferrites are well known materials due to its numerous technological applications especially in microwave devices. Lithium ferrite nanoparticles were prepared by sol-gel technique by means of Pechini method, and then annealed at different temperatures in 250–1000 °C range. XRD confirms spinel formation with particles sizes in 15–700 nm range, with increased size with annealing temperature, whereas FTIR and Raman measurement confirm that single phase lithium ferrite with ordered cationic structure is obtained. Microwave magnetoabsorption data of the annealed lithium ferrite nanoparticles were obtained with a broadband system based on a network analyzer that operates up to 8.5 GHz. At fields up to 200 mT we can observe a broad absorption peak that shifts to higher frequencies with magnetic field according to ferromagnetic resonance theory. The amplitude of absorption, up to 85%, together with the frequency width of about 5.5 GHz makes this material suitable as wave absorber. FMR parameters like resonance field, linewidth and broadening are analyzed in order to obtain the characteristic parameters and analyze the microwave behaviour.
PB Elsevier
SN 0925-8388
YR 2018
FD 2018
LK http://uvadoc.uva.es/handle/10324/37263
UL http://uvadoc.uva.es/handle/10324/37263
LA eng
NO Journal of Alloys and Compounds, 2018, vol. 765. p. 186-192
NO Producción Científica
DS UVaDOC
RD 25-abr-2024