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Balaev, D. A.
Semenov, S. V.
Dubrovskiy, A. A.
Yakushkin, S. S.
Kirillov, V. L.
Martyanov, O. N.
2018-02-07T07:32:46Z
2018-02-07T07:32:46Z
2017
Balaev, D. A. Superparamagnetic blocking of an ensemble of magnetite nanoparticles upon interparticle interactions [Текст] / D. A. Balaev, S. V. Semenov, A. A. Dubrovskiy, S. S. Yakushkin, V. L. Kirillov, O. N. Martyanov // Journal of Magnetism and Magnetic Materials. — 2017. — Т. 440. — С. 199-202
03048853
http://www.sciencedirect.com/science/article/pii/S0304885316331390
http://elib.sfu-kras.ru/handle/2311/70148
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
Superparamagnetic blocking of an ensemble of magnetite nanoparticles upon interparticle interactions
Journal Article
Journal Article Preprint
199-202
29.19.41
2018-02-07T07:32:46Z
10.1016/j.jmmm.2016.12.046
Институт инженерной физики и радиоэлектроники
Кафедра общей физики
Journal of Magnetism and Magnetic Materials
Q1
Q2


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