کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5490794 1524781 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Superparamagnetic blocking of an ensemble of magnetite nanoparticles upon interparticle interactions
ترجمه فارسی عنوان
مسدود کردن فوق پارامغناطیسی مجموعه ای از نانوذرات مغناطیسی بر روی تعاملات متقابل
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 440, 15 October 2017, Pages 199-202
نویسندگان
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