TY  - JOUR
AU  - Omelyanchik, Alexander
AU  - da Silva, Franciscarlos Gomes
AU  - Gomide, Guilherme
AU  - Kozenkov, Ivan
AU  - Depeyrot, Jerome
AU  - Aquino, Renata
AU  - Campos, Alex Fabiano Cortez
AU  - Fiorani, Dino
AU  - Peddis, Davide
AU  - Rodionova, Valeria
AU  - Jovanović, Sonja
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9857
AB  - The structural and magnetic properties of iron oxide nanoparticles obtained by the precipitation of iron ions in the presence of different amounts of citric acid were studied. The citric acid acts as a capping agent and provides control of the particle size to be obtained. The size dependence of the magnetic properties was investigated by comparing the results for ~2, 4, 6, and 8 nm particles. With decreasing the particle size, a reduction of the saturation magnetization (from ~84 to 33 Am2/kg) and an increase of coercivity (from ~32 to ~100 mT) were observed, due to the increasing role of the disordered surface. The behaviour of the zero-field cooled/field cooled magnetization curves indicates a superspin-glass freezing for 2 nm and 4 nm particle samples. Memory experiments below the freezing temperature on the 2 nm particle sample provide further evidence of a glassy magnetic state. The observation of exchange bias, due to core/shell interface exchange coupling, for 2 nm and 4 nm particle samples provides evidence of a surface spin-glass type freezing, which contributes to the observed glassy properties.
T2  - Journal of Alloys and Compounds
T1  - Effect of citric acid on the morpho-structural and magnetic properties of ultrasmall iron oxide nanoparticles
VL  - 883
SP  - 160779
DO  - 10.1016/j.jallcom.2021.160779
ER  - 

@article{
author = "Omelyanchik, Alexander and da Silva, Franciscarlos Gomes and Gomide, Guilherme and Kozenkov, Ivan and Depeyrot, Jerome and Aquino, Renata and Campos, Alex Fabiano Cortez and Fiorani, Dino and Peddis, Davide and Rodionova, Valeria and Jovanović, Sonja",
year = "2021",
abstract = "The structural and magnetic properties of iron oxide nanoparticles obtained by the precipitation of iron ions in the presence of different amounts of citric acid were studied. The citric acid acts as a capping agent and provides control of the particle size to be obtained. The size dependence of the magnetic properties was investigated by comparing the results for ~2, 4, 6, and 8 nm particles. With decreasing the particle size, a reduction of the saturation magnetization (from ~84 to 33 Am2/kg) and an increase of coercivity (from ~32 to ~100 mT) were observed, due to the increasing role of the disordered surface. The behaviour of the zero-field cooled/field cooled magnetization curves indicates a superspin-glass freezing for 2 nm and 4 nm particle samples. Memory experiments below the freezing temperature on the 2 nm particle sample provide further evidence of a glassy magnetic state. The observation of exchange bias, due to core/shell interface exchange coupling, for 2 nm and 4 nm particle samples provides evidence of a surface spin-glass type freezing, which contributes to the observed glassy properties.",
journal = "Journal of Alloys and Compounds",
title = "Effect of citric acid on the morpho-structural and magnetic properties of ultrasmall iron oxide nanoparticles",
volume = "883",
pages = "160779",
doi = "10.1016/j.jallcom.2021.160779"
}

Omelyanchik, A., da Silva, F. G., Gomide, G., Kozenkov, I., Depeyrot, J., Aquino, R., Campos, A. F. C., Fiorani, D., Peddis, D., Rodionova, V.,& Jovanović, S.. (2021). Effect of citric acid on the morpho-structural and magnetic properties of ultrasmall iron oxide nanoparticles. in Journal of Alloys and Compounds, 883, 160779.
https://doi.org/10.1016/j.jallcom.2021.160779

Omelyanchik A, da Silva FG, Gomide G, Kozenkov I, Depeyrot J, Aquino R, Campos AFC, Fiorani D, Peddis D, Rodionova V, Jovanović S. Effect of citric acid on the morpho-structural and magnetic properties of ultrasmall iron oxide nanoparticles. in Journal of Alloys and Compounds. 2021;883:160779.
doi:10.1016/j.jallcom.2021.160779 .

Omelyanchik, Alexander, da Silva, Franciscarlos Gomes, Gomide, Guilherme, Kozenkov, Ivan, Depeyrot, Jerome, Aquino, Renata, Campos, Alex Fabiano Cortez, Fiorani, Dino, Peddis, Davide, Rodionova, Valeria, Jovanović, Sonja, "Effect of citric acid on the morpho-structural and magnetic properties of ultrasmall iron oxide nanoparticles" in Journal of Alloys and Compounds, 883 (2021):160779,
https://doi.org/10.1016/j.jallcom.2021.160779 . .

TY  - JOUR
AU  - Muscas, Giuseppe
AU  - Jovanović, Sonja
AU  - Vukomanović, Marija
AU  - Spreitzer, Matjaž
AU  - Peddis, Davide
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0925838819316147
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8194
AB  - Magnetic nanoparticles represent complex but very interesting objects. They combine the bulk properties with novel phenomena emerging at the nanoscale due to finite-size effects. The recent development of the synthetic procedures allows having a strong control on the size and shape of individual particles and on their physical-chemical structure. Among different magnetic materials, spinel ferrite nanoparticles offer strong chemical and physical stability as well as tunable magnetic properties. In the present article, we investigate the effect of Zn substitution in cobalt ferrite nanoparticles. The technological development of nanoparticle-based magnetic materials aims to find a balance between a well-defined magnetic behavior of individual elements and their strong interactions, which arise from the need of miniaturization that leads to dense ensembles of the system's constituents. Within this complex context, we provide one route to optimize the properties of small spinel ferrite particles by tuning their chemical composition without compromise their structural properties, and with full control of their size and shape. Furthermore, we propose an advanced analysis of their magnetic properties in the framework of the random anisotropy model. We will show that the chemical composition not only determines the intrinsic anisotropy energy of each nanoparticle but also owns a profound effect on the interparticle interactions. © 2019 Elsevier B.V.
T2  - Journal of Alloys and Compounds
T1  - Zn-doped cobalt ferrite: Tuning the interactions by chemical composition
VL  - 796
SP  - 203
EP  - 209
DO  - 10.1016/j.jallcom.2019.04.308
ER  - 

@article{
author = "Muscas, Giuseppe and Jovanović, Sonja and Vukomanović, Marija and Spreitzer, Matjaž and Peddis, Davide",
year = "2019",
abstract = "Magnetic nanoparticles represent complex but very interesting objects. They combine the bulk properties with novel phenomena emerging at the nanoscale due to finite-size effects. The recent development of the synthetic procedures allows having a strong control on the size and shape of individual particles and on their physical-chemical structure. Among different magnetic materials, spinel ferrite nanoparticles offer strong chemical and physical stability as well as tunable magnetic properties. In the present article, we investigate the effect of Zn substitution in cobalt ferrite nanoparticles. The technological development of nanoparticle-based magnetic materials aims to find a balance between a well-defined magnetic behavior of individual elements and their strong interactions, which arise from the need of miniaturization that leads to dense ensembles of the system's constituents. Within this complex context, we provide one route to optimize the properties of small spinel ferrite particles by tuning their chemical composition without compromise their structural properties, and with full control of their size and shape. Furthermore, we propose an advanced analysis of their magnetic properties in the framework of the random anisotropy model. We will show that the chemical composition not only determines the intrinsic anisotropy energy of each nanoparticle but also owns a profound effect on the interparticle interactions. © 2019 Elsevier B.V.",
journal = "Journal of Alloys and Compounds",
title = "Zn-doped cobalt ferrite: Tuning the interactions by chemical composition",
volume = "796",
pages = "203-209",
doi = "10.1016/j.jallcom.2019.04.308"
}

Muscas, G., Jovanović, S., Vukomanović, M., Spreitzer, M.,& Peddis, D.. (2019). Zn-doped cobalt ferrite: Tuning the interactions by chemical composition. in Journal of Alloys and Compounds, 796, 203-209.
https://doi.org/10.1016/j.jallcom.2019.04.308

Muscas G, Jovanović S, Vukomanović M, Spreitzer M, Peddis D. Zn-doped cobalt ferrite: Tuning the interactions by chemical composition. in Journal of Alloys and Compounds. 2019;796:203-209.
doi:10.1016/j.jallcom.2019.04.308 .

Muscas, Giuseppe, Jovanović, Sonja, Vukomanović, Marija, Spreitzer, Matjaž, Peddis, Davide, "Zn-doped cobalt ferrite: Tuning the interactions by chemical composition" in Journal of Alloys and Compounds, 796 (2019):203-209,
https://doi.org/10.1016/j.jallcom.2019.04.308 . .