Superparamagnetic Blocking of an Ensemble of Magnetite Nanoparticles upon Interparticle Interactions | Sciact - CRIS-система Института катализа

Superparamagnetic Blocking of an Ensemble of Magnetite Nanoparticles upon Interparticle Interactions Научная публикация

Конференция

VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016)
15-19 авг. 2016 , Krasnoyarsk

Журнал

Journal of Magnetism and Magnetic Materials
ISSN: 0304-8853

Вых. Данные

Год: 2017, Том: 440, Страницы: 199-202 Страниц : 4 DOI: 10.1016/j.jmmm.2016.12.046

Ключевые слова

Blocking temperature, Fe3O4 nanoparticles, Size effect, Superparamagnetic nanoparticles

Авторы

Balaev D.A. ^1,2 , Semenov S.V. ^1,2 , Dubrovskiy A.A. ¹ , Yakushkin S.S. ^3,4 , Kirillov V.L. ³ , Martyanov O.N. ^3,4

Организации

1	Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
2	Siberian Federal University, Krasnoyarsk 660041, Russia
3	Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
4	Novosibirsk State University, Novosibirsk 630090, Russia

Информация о финансировании (1)

Российский фонд фундаментальных исследований

16-32-50156

We report on the effect of interparticle magnetic interactions in an ensemble of superparamagnetic magnetite particles with an average size of ~8.4 nm dispersed in the diamagnetic matrix on the blocking of this ensemble in external magnetic field. The two limit cases are investigated: the case of strongly interacting particles, when the value of magnetic dipole-dipole interaction between particles is comparable with the energy of other interactions in the ensemble (the interparticle distance is similar to the nanoparticle diameter) and the case of almost noninteracting particles distant from each other by about ten particle diameters. We demonstrate that the experimental dependence of the blocking temperature on external field is described well within the model [1], in which the density of particles in a nonmagnetic medium is taken into account and the correlation value depends on external magnetic field. The model for describing the magnetic properties of a disperse nanoparticle ensemble is proposed, which makes corrections related to the particle size and mean dipole-dipole interaction energy for the anisotropy constant. The surface magnetic anisotropy of Fe3O4 particles and parameters of the interparticle coupling are estimated.

Balaev D.A. , Semenov S.V. , Dubrovskiy A.A. , Yakushkin S.S. , Kirillov V.L. , Martyanov O.N.
Superparamagnetic Blocking of an Ensemble of Magnetite Nanoparticles upon Interparticle Interactions

Journal of Magnetism and Magnetic Materials. 2017. V.440. P.199-202. DOI: 10.1016/j.jmmm.2016.12.046 WOS Scopus РИНЦ CAPlus OpenAlex

Полный текст от издателя

Поступила в редакцию:	21 нояб. 2016 г.
Принята к публикации:	18 дек. 2016 г.
Опубликована online:	20 дек. 2016 г.
Опубликована в печати:	15 окт. 2017 г.

Web of science:	WOS:000406865200055
Scopus:	2-s2.0-85014224373
РИНЦ:	31044993
Chemical Abstracts:	2017:370658
OpenAlex:	W2566328535

БД	Цитирований
Web of science	40
Scopus	45
РИНЦ	45
OpenAlex	45