About: Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites

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About: Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	In magnetism of nanoparticles, surface spin effects play a key role. The so-called spin canting at the surface leads either to lowering of saturation magnetization, or even to lack of saturation in high magnetic fields. The value of the saturation magnetization depends on cation distribution within the spinel network and on the spin canting angles. We have investigated structure and magnetic behavior of CoFe2O4 nanoparticles doped with La (Co1-xLaxFe2O4, x 0.05 - 0.5 and CoLaxFe2-xO4, x 0.05 - 0.2) embedded in amorphous silica matrix prepared by a sol-gel method. The samples were characterized using X-ray diffraction and TEM. The zero-field cooled and field cooled measurements of magnetization showed that the blocking temperature is well above the room temperature. The high coercivity was observed (up to 2 T at 10 K) and no saturation of the magnetization even in applied field of 7 T was obtained, suggesting considerable spin canting effects. Finally, the Mossbauer spectroscopy under magnetic field and down to low temperature was performed to determine the cation distribution and the spin canting angles. In magnetism of nanoparticles, surface spin effects play a key role. The so-called spin canting at the surface leads either to lowering of saturation magnetization, or even to lack of saturation in high magnetic fields. The value of the saturation magnetization depends on cation distribution within the spinel network and on the spin canting angles. We have investigated structure and magnetic behavior of CoFe2O4 nanoparticles doped with La (Co1-xLaxFe2O4, x 0.05 - 0.5 and CoLaxFe2-xO4, x 0.05 - 0.2) embedded in amorphous silica matrix prepared by a sol-gel method. The samples were characterized using X-ray diffraction and TEM. The zero-field cooled and field cooled measurements of magnetization showed that the blocking temperature is well above the room temperature. The high coercivity was observed (up to 2 T at 10 K) and no saturation of the magnetization even in applied field of 7 T was obtained, suggesting considerable spin canting effects. Finally, the Mossbauer spectroscopy under magnetic field and down to low temperature was performed to determine the cation distribution and the spin canting angles. (en)
Title	Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites (en)
skos:prefLabel	Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites (en)
skos:notation	RIV/61388980:_____/11:00440078!RIV15-GA0-61388980
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GAP108/10/1250)
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Holec, Petr Plocek, Jiří
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav anorganické chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	217325
http://linked.open...ai/riv/idVysledku	RIV/61388980:_____/11:00440078
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Amorphous Silica matrix; Applied field; Blocking temperature; Cation distributions; Field cooled (en)
http://linked.open.../riv/klicoveSlovo	Blocking temperature Amorphous Silica matrix Applied field Cation distributions Field cooled
http://linked.open...ontrolniKodProRIV	[EB3F0A83DBAC]
http://linked.open...v/mistoKonaniAkce	Osaka
http://linked.open...i/riv/mistoVydani	Bristol
http://linked.open...i/riv/nazevZdroje	IOP conference series: Materials science and engineering
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Multifunctional nanoparticles: smart preparation methods and study of their physical properties
http://linked.open...UplatneniVysledku	2011
http://linked.open...iv/tvurceVysledku	Holec, Petr Nižňanský, D. Plocek, Jiří Vejpravová, J. Burianova, S.
http://linked.open...vavai/riv/typAkce	WRD - Světová
http://linked.open.../riv/zahajeniAkce	2010-11-14 (xsd:date)
issn	1757-8981
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.1088/1757-899X/18/2/022015
http://purl.org/ne...btex#hasPublisher	IOP Publishing

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