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Jalili, Hajar; Aslibeiki, Bagher; Ghotbi Varzaneh, Ali; Chernenko, Volodymyr A
Beilstein journal of nanotechnology, 2019, Letnik: 10, Številka: 1Journal Article
Recent advances in the field of magnetic materials emphasize that the development of new and useful magnetic nanoparticles (NPs) requires an accurate and fundamental understanding of their collective magnetic behavior. Studies show that the magnetic properties are strongly affected by the magnetic anisotropy of NPs and by interparticle interactions that are the result of the collective magnetic behavior of NPs. Here we study these effects in more detail. For this purpose, we prepared Co Fe O NPs, with = 0-1 in steps of 0.2, from soft magnetic (Fe O ) to hard magnetic (CoFe O ) ferrite, with a significant variation of the magnetic anisotropy. The phase purity and the formation of crystalline NPs with a spinel structure were confirmed through Rietveld refinement. The effect of Co doping on structure, morphology and magnetic properties of Co Fe O samples was investigated. In particular, we examined the interparticle interactions in the samples by δ graphs and Henkel plots that have not been reported before in literature. Finally, we studied the hyperthermia properties and observed that the heat efficiency of soft Fe O is about 4 times larger than that of hard CoFe O ferrite, which was attributed to the high coercive field of samples compared with the external field amplitude.
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