Revealing crucial factors governing magnetic properties of high-energy ball-milled CoFe2O4 nanoparticles
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10508728" target="_blank" >RIV/00216208:11320/25:10508728 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QkuR~9zLNt" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QkuR~9zLNt</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ceramint.2024.11.491" target="_blank" >10.1016/j.ceramint.2024.11.491</a>
Alternative languages
Result language
angličtina
Original language name
Revealing crucial factors governing magnetic properties of high-energy ball-milled CoFe2O4 nanoparticles
Original language description
Nanostructured spinel-type ferrites have attracted significant interest from both the aspects of fundamental research and industrial application owing to their outstanding electronic and magnetic properties. Understanding the factors governing their magnetic properties is important for designing advanced materials with tailored features. In this work, we have conducted a systematic investigation on the structural, electronic, and magnetic properties of high-energy ball-milled CoFe2O4 nanoparticles, which possess a cubic spinel structure and average crystallite sizes (D) ranging from 334 nm for the initial bulk material to 11.7 nm after 120 min of milling. Our observations indicated that the high-energy milling leads to the migration of Co2+ ions from the octahedral B site to the tetrahedral A site, and vice versa for Fe3+ ions. The concentration of Co2+ ions at the A site increases linearly versus the 1/D value. Unlike previous studies on CFO, we have found that the spin canting of Fe3+ ions occurred at both the A and B sites within the inner core, not only on the surface of nanoparticles. The spin canting angles phi A and phi B increase with grain-size reduction. Although the milling-induced changes in the cation distribution and spin canting are expected to significantly increase the saturation magnetization, this effect is overshadowed by the decrease caused by surface spin disorder. In other words, the surface effects play the primary role affecting the magnetic properties of the milled CFO nanoparticles.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
<a href="/en/project/GA19-02584S" target="_blank" >GA19-02584S: Modification of Néel and Brownian relaxation properties of nanoparticles for magnetic imaging methods</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Ceramics International
ISSN
0272-8842
e-ISSN
1873-3956
Volume of the periodical
51
Issue of the periodical within the volume
4
Country of publishing house
GB - UNITED KINGDOM
Number of pages
13
Pages from-to
5168-5180
UT code for WoS article
001407941900001
EID of the result in the Scopus database
2-s2.0-85211099622