Research output: Contribution to journal › Article › peer-review
Superparamagnetic blocking of an ensemble of magnetite nanoparticles upon interparticle interactions. / Balaev, D. A.; Semenov, S. V.; Dubrovskiy, A. A. et al.
In: Journal of Magnetism and Magnetic Materials, Vol. 440, 15.10.2017, p. 199-202.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Superparamagnetic blocking of an ensemble of magnetite nanoparticles upon interparticle interactions
AU - Balaev, D. A.
AU - Semenov, S. V.
AU - Dubrovskiy, A. A.
AU - Yakushkin, S. S.
AU - Kirillov, V. L.
AU - Martyanov, O. N.
PY - 2017/10/15
Y1 - 2017/10/15
N2 - 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.
AB - 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.
KW - Blocking temperature
KW - FeO nanoparticles
KW - Size effect
KW - Superparamagnetic nanoparticles
KW - TEMPERATURE
KW - RESONANCE
KW - Fe3O4 nanoparticles
KW - ANISOTROPY
UR - http://www.scopus.com/inward/record.url?scp=85014224373&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2016.12.046
DO - 10.1016/j.jmmm.2016.12.046
M3 - Article
AN - SCOPUS:85014224373
VL - 440
SP - 199
EP - 202
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
ER -
ID: 9960062