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Fizika Tverdogo Tela, 2017, Volume 59, Issue 10, Pages 1920–1926
DOI: https://doi.org/10.21883/FTT.2017.10.44959.115
(Mi ftt9422)
 

This article is cited in 19 scientific papers (total in 19 papers)

Magnetism

Temperature behavior of the antiferromagnetic susceptibility of nanoferrihydrite from the measurements of the magnetization curves in fields of up to 250 kOe

D. A. Balaevab, S. I. Popkovab, A. A. Krasikovab, A. D. Balaeva, A. A. Doubrovskiia, S. V. Stolyarab, R. N. Yaroslavtsevab, V. P. Ladyginac, R. S. Iskhakova

a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
b Siberian Federal University, Krasnoyarsk
c Presidium of the Federal Scientific Center "Krasnoyarsk Scientific Center", Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
Abstract: The cross-breeding problem of the temperature dependence of the antiferromagnetic susceptibility of ferrihydrite nanoparticles is considered. Iron ions Fe$^{3+}$ in ferrihydrite are ordered antiferromagnetically; however, the existence of defects on the surface and in the bulk of nanoparticles induces a noncompensated magnetic moment that leads to a typical superparamagnetic behavior of ensemble of the nanoparticles with a characteristic blocking temperature. In an unblocked state, magnetization curves of such objects are described as a superposition of the Langevin function and the linear-in-field contribution of the antiferromagnetic “core” of the nanoparticles. According to many studies of the magnetization curves performed on ferrihydrite (and related ferritin) nanoparticles in fields to 60 kOe, dependence $\chi_{\operatorname{AF}}(T)$ decreases as temperature increases, which was related before to the superantiferromagnetism effect. As the magnetic field range increases to 250 kOe, the values of $\chi_{\operatorname{AF}}$ obtained from an analysis of the magnetization curves become lower in magnitude; however, the character of the temperature evolution of $\chi_{\operatorname{AF}}$ is changed: now, dependence $\chi_{\operatorname{AF}}(T)$ is an increasing function. The latter is typical for a system of AF particles with random orientation of the crystallographic axes. To correctly determine the antiferromagnetic susceptibility of AF nanoparticles (at least, ferrihydrite) and to search for effects related to the superantiferromagnetism effect, it is necessary to use in experiments the range of magnetic field significantly higher than that the standard value 60 kOe used in most experiments. The study of the temperature evolution of the magnetization curves shows that the observed crossover is due to the existence of small magnetic moments in the samples.
Received: 04.04.2017
English version:
Physics of the Solid State, 2017, Volume 59, Issue 10, Pages 1940–1946
DOI: https://doi.org/10.1134/S1063783417100031
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: D. A. Balaev, S. I. Popkov, A. A. Krasikov, A. D. Balaev, A. A. Doubrovskii, S. V. Stolyar, R. N. Yaroslavtsev, V. P. Ladygina, R. S. Iskhakov, “Temperature behavior of the antiferromagnetic susceptibility of nanoferrihydrite from the measurements of the magnetization curves in fields of up to 250 kOe”, Fizika Tverdogo Tela, 59:10 (2017), 1920–1926; Phys. Solid State, 59:10 (2017), 1940–1946
Citation in format AMSBIB
\Bibitem{BalPopKra17}
\by D.~A.~Balaev, S.~I.~Popkov, A.~A.~Krasikov, A.~D.~Balaev, A.~A.~Doubrovskii, S.~V.~Stolyar, R.~N.~Yaroslavtsev, V.~P.~Ladygina, R.~S.~Iskhakov
\paper Temperature behavior of the antiferromagnetic susceptibility of nanoferrihydrite from the measurements of the magnetization curves in fields of up to 250 kOe
\jour Fizika Tverdogo Tela
\yr 2017
\vol 59
\issue 10
\pages 1920--1926
\mathnet{http://mi.mathnet.ru/ftt9422}
\crossref{https://doi.org/10.21883/FTT.2017.10.44959.115}
\elib{https://elibrary.ru/item.asp?id=30108720}
\transl
\jour Phys. Solid State
\yr 2017
\vol 59
\issue 10
\pages 1940--1946
\crossref{https://doi.org/10.1134/S1063783417100031}
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  • This publication is cited in the following 19 articles:
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