Towards bi-magnetic nanocomposites as permanent magnets through the optimization of the synthesis and magnetic properties of SrFe12O19 nanocrystallites

Maltoni, P.; Sarkar, T.; Varvaro, G.; Barucca, G.; Ivanov, S.A.; Peddis, D.; Mathieu, R.

Авторы: Maltoni P., Sarkar T., Varvaro G., Barucca G., Ivanov S.A., Peddis D., Mathieu R.
Журнал: Journal of Physics D - Applied Physics
Том: 54
Год издания: 2021
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 124004
Последняя страница: 124014
DOI: 10.1088/1361-6463/abd20d
Аннотация: Sol–gel synthesis was used in order to obtain nanocrystallites of the SrFe12O19 (SFO)hexaferrite in an efficient and reliable way. By optimizing the initial synthetic conditions, wewere able to control the size of the nanoparticles (NPs), at lower annealing temperature. Thex-ray powder diffraction, transmission electron microscopy (TEM), and magneticmeasurements have demonstrated a significant relation between the morphology, size, andmagnetic properties of the nanoscale SFO, revealing a definite dependence on the crystallite sizealong the c-axis. The obtained NPs appear almost isotropic, in the form of platelets and exhibitsimilar magnetic performance, in terms of the energy product (BH)MAX, thus, demonstrating thesuitability of reducing the annealing temperature without any deterioration in the magneticproperties. Additionally, this work illustrates the feasibility of the sol–gel bottom-up approachto employ magnetic NPs as building-blocks for designing hard/soft exchange-coupledbi-magnetic nanocomposites, combining the high coercivity of a hard phase (SFO) and the highsaturation magnetization of a soft phase (CoFe2O4); in this regard, we discuss the tunability ofthe magnetic anisotropy by symbiotically restricting the growth of both phases.
Добавил в систему: Иванов Сергей Александрович

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Towards bi-magnetic nanocomposites as permanent magnets through the optimization of the synthesis and magnetic properties of SrFe12O19 nanocrystallitesстатья

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