Observation of surface effects in La-doped CoFe2O4/SiO2 nanocomposites
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F11%3A10110972" target="_blank" >RIV/00216208:11310/11:10110972 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/11:10110972
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 CoFe2O4/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 elds. 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 diraction and TEM. The zero-eld cooled and eld 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 eld of 7 T was obtained, suggesting considerable spin canting effects. Finally, the Mossbauer spectroscopy under magneti
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
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)<br>S - Specificky vyzkum na vysokych skolach
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
IOP Conference Series: Materials Science and Engineering
ISSN
1757-8981
e-ISSN
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Volume of the periodical
18
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
4
Pages from-to
1-4
UT code for WoS article
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EID of the result in the Scopus database
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