RT info:eu-repo/semantics/article
T1 Broadband ferromagnetic resonance in Mn-doped Li ferrite nanoparticles
A1 Hernández Gómez, Pablo
A1 Muñoz Muñoz, José María
A1 Almeida Valente, Manuel
A1 Fernandes Graça, Manuel Pedro
K1 Magnetic materials
K1 Materiales magnéticos
K1 Oxide
K1 Óxido
K1 Sol-gel processes
K1 Procesos sol-gel
K1 2202.08 Magnetismo
AB Lithium ferrites are well known materials due to their numerous technological applications especially in microwave devices. Mn-doped 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 particle size in the 15–200 nm range, with increased size with annealing temperature. Microwave magnetoabsorption data of annealed lithium ferrite nanoparticles, obtained with a broadband system based on a network analyzer operating up to 8.5 GHz are presented. At fields up to 200 m T 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 4.5 GHz makes this material suitable as wave absorber. Samples annealed at higher temperatures show a behaviour similar to polycrystalline samples, thus suggesting their multidomain character.
PB Elsevier
SN 0025-5408
YR 2019
FD 2019
LK http://uvadoc.uva.es/handle/10324/37264
UL http://uvadoc.uva.es/handle/10324/37264
LA eng
NO Materials Research Bulletin, 2019, vol. 112. p. 432-437
NO Producción Científica
DS UVaDOC
RD 23-nov-2024