Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F11%3A00440078" target="_blank" >RIV/61388980:_____/11:00440078 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/1757-899X/18/2/022015" target="_blank" >http://dx.doi.org/10.1088/1757-899X/18/2/022015</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1757-899X/18/2/022015" target="_blank" >10.1088/1757-899X/18/2/022015</a>
Alternative languages
Result language
angličtina
Original language name
Observation of surface effects in La-doped CoFe2O 4/SiO2 nanocomposites
Original language 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 roomtemperature. 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 m
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
CA - Inorganic chemistry
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GAP108%2F10%2F1250" target="_blank" >GAP108/10/1250: Multifunctional nanoparticles: smart preparation methods and study of their physical properties</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
IOP conference series: Materials science and engineering
ISBN
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ISSN
1757-8981
e-ISSN
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Number of pages
4
Pages from-to
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Publisher name
IOP Publishing
Place of publication
Bristol
Event location
Osaka
Event date
Nov 14, 2010
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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