Электронный каталог

Статья

Kmjec, T.
Revealing Crucial Factors Governing Magnetic Properties of High-Energy Ball-Milled CoFe&sub(2)O&sub(4) Nanoparticles / T.Kmjec, D.P.Kozlenko, S.E.Kichanov, A.V.Rutkauskas, V.T.Nguyen, E.A.Korneeva, [a.o.] // Ceramics International [Electronic resource]. – 2025. – Vol. 51, No. 4. – C. 5168-5180. – URL: https://doi.org/10.1016/j.ceramint.2024.11.491. – Bibliogr.: 72.

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 Co&sup(2+) ions from the octahedral B site to the tetrahedral A site, and vice versa for Fe&sup(3+) ions. The concentration of Co&sup(2+) 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 Fe&sup(3+) ions occurred at both the A and B sites within the inner core, not only on the surface of nanoparticles. The spin canting angles *f&sub(A) and *f&sub(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.



Спец.(статьи,препринты) = С 33 а - Нанофизика. Нанотехнология$
Спец.(статьи,препринты) = С 44 г - Физико-химические методы анализа элементов. Анализ с помощью ядерных методов
ОИЯИ = ОИЯИ (JINR)2025