Superparamagnetic Relaxation in Ensembles of Ultrasmall Ferrihydrite Nanoparticles : научное издание

Knyazev Yu.V.; Balaev D.A.; Skorobogatov S.A.; Velikanov D.A.; Bayukov O.A.; Stolyar S.V.; Ladygina V.P.; Krasikov A.A.; Iskhakov R.S.

Дополнительные ссылки: eLibrary

База данных: Каталог библиотеки СФУ

Библиографическое описание: Superparamagnetic Relaxation in Ensembles of Ultrasmall Ferrihydrite Nanoparticles : научное издание / Yu. V. Knyazev, D. A. Balaev, S. A. Skorobogatov [et al.]. - Текст : непосредственный // Physics of Metals and Metallography. - 2024. - Т. 125, № 4. - P. 377-385. - The work was conducted as part of the state assignment of the Kirensky Institute of Physics SB RAS, while the synthesis of biogenic ferrihydrite was carried out as part of the state assignment of the Krasnoyarsk Scientific Center SB RAS. - ISSN 0031-918X. - ISSN 1555-6190, DOI 10.1134/S0031918X23603025.

Аннотация: The paper examines the impact of interparticle interactions on the superparamagnetic relaxation of ultrasmall nanoparticle ensembles, using Fe2O3∙nH2O iron oxyhydroxide (ferrihydrite) nanoparticles as an example. Two samples were analyzed: ferrihydrite of biogenic origin (with an average particle size of $\left\langle d \right\rangle $ ≈ 2.7 nm) with a natural organic shell, and a sample (with $\left\langle d \right\rangle $ ≈ 3.5 nm) that underwent low-temperature annealing, during which the organic shell was partially removed. The DC and AC magnetic susceptibilities (χ′(T), χ′′(T)) in a small magnetic field in the superparamagnetic (SPM) blocking region of the nanoparticles were measured. The results show that an increase in interparticle interactions leads to an increase in the SPM blocking temperature from 28 to 52 K according to DC magnetization data. It is shown that below the SPM blocking temperature, magnetic interactions of nanoparticles lead to the formation of a collective state similar to spin glass in bulk materials. The scaling approach reveals that the dynamics of correlated magnetic moments on the particle surface slow down with increasing interparticle interactions. Simulation of χ′′(T) dependence has shown that the dissipation of magnetic energy occurs in two stages. The first stage is directly related to the blocking of the magnetic moment of nanoparticles, while the second stage reflects the spin-glass behavior of surface spins and strongly depends on the strength of interparticle interactions.

Год издания: 2024

Авторы: Knyazev Yu.V. , Balaev D.A. , Skorobogatov S.A. , Velikanov D.A. , Bayukov O.A. , Stolyar S.V. , Ladygina V.P. , Krasikov A.A. , Iskhakov R.S.

Издательство: Pleiades Publishing, Ltd., Moscow

Источник: Physics of Metals and Metallography

Выпуск: Т. 125, № 4

Номера страниц: 377-385

Держатель оригинала документа: FRC Krasnoyarsk Scientific Center (KSC), Siberian Branch of the Russian Academy of Sciences, Kirensky Institute of Physics, Federal Research Center (FRC), KSC SB RAS

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