Magnetic resonance study of exchange-biased Ni/NiO nanoparticles.
J Phys Condens Matter
; 29(21): 215802, 2017 Jun 01.
Article
en En
| MEDLINE
| ID: mdl-28437258
Finite sized Ni/NiO nanoparticles (NPs) are prepared by oxidizing pure Ni-NPs in an ambient atmosphere with varying annealing time (t A). A synchrotron radiation x-ray diffraction technique was used to estimate the grain size, weight fraction and lattice parameters of Ni and NiO. The temperature (T) dependencies of effective g-factor and line-width of ferromagnetic resonance (FMR) spectra for a series of Ni/NiO NPs are determined. Three T-regions with different FMR behaviors T > 200 K, 200 > T > 130 K and T < 130 K are identified. In particular, for T < 200 K, the T-dependency of the g-factor reveals an evolution of exchange coupling between Ni and NiO due to the gradual oxidation of Ni NPs.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
J Phys Condens Matter
Asunto de la revista:
BIOFISICA
Año:
2017
Tipo del documento:
Article
País de afiliación:
Taiwán
Pais de publicación:
Reino Unido