Observation of surface effects in La-doped CoFe2O4/SiO2 nanocomposites

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/11:10110972

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Observation of surface effects in La-doped CoFe2O4/SiO2 nanocomposites

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

Observation of surface effects in La-doped CoFe2O4/SiO2 nanocomposites

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GAP108%2F10%2F1250" target="_blank" >GAP108/10/1250: Multifunkční nanočástice: pokročilé metody přípravy a studium jejich fyzikálních vlastností</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

IOP Conference Series: Materials Science and Engineering

ISSN

1757-8981

e-ISSN

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Svazek periodika

18

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

4

Strana od-do

1-4

Kód UT WoS článku

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EID výsledku v databázi Scopus

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