Surface spin effects in La-doped CoFe.sub.2./sub.O.sub.4./sub. nanoparticles prepared by microemulsion route

0367611 - FZÚ 2012 RIV US eng J - Článek v odborném periodiku
Burianová, Simona - Poltierová Vejpravová, Jana - Holec, Petr - Plocek, J. - Nižňanský, D.
Surface spin effects in La-doped CoFe₂O₄ nanoparticles prepared by microemulsion route.
Journal of Applied Physics. Roč. 110, č. 7 (2011), "073902-1"-"073902-7". ISSN 0021-8979. E-ISSN 1089-7550
Výzkumný záměr: CEZ:AV0Z10100520; CEZ:AV0Z40320502
Klíčová slova: CoFe₂O₄ nanoparticles * lanthanum doping * microemulsion route * high coercivity * surface spin effects
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.168, rok: 2011

A comparative study of pure CoFe2O4 nanoparticles and La-doped CoFe2O4 nanoparticles, prepared by microemulsion route has been performed. The samples were characterized using x-ray diffraction and transmission electron microscopy in order to obtain average particle size. preparation route. The samples were investigated by magnetization measurements, which revealed the coercivity values strongly dependent on particle size, but not significantly on level of La3ţ doping. Detailed in-field Mo¨ssbauer spectroscopy studies were performed in order to determine spin canting angles and cation distribution within the spinel network. The non-negligible canting angles up to 40_ in the La-doped samples were observed. The presence of the spin surface effects was also supported by magnetic measurement as the magnetization did not saturate even in considerably high magnetic fields (7 T).
Trvalý link: http://hdl.handle.net/11104/0202215