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Formation of the magnetic fractal structure in Co S i O 2 granular nanocomposite system at percolation threshold
Author(s) -
Dokukin E. B.,
Erhan R. V.,
Islamov A. Kh.,
Dokukin M. E.,
Perov N. S.,
Gan'shina E. A.
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248379
Subject(s) - percolation (cognitive psychology) , percolation threshold , materials science , nanocomposite , neutron scattering , nanoclusters , fractal , condensed matter physics , scattering , magnetic nanoparticles , percolation theory , chemical physics , nanotechnology , chemistry , conductivity , nanoparticle , physics , electrical resistivity and conductivity , optics , mathematical analysis , mathematics , quantum mechanics , neuroscience , biology
Magnetic and structural properties of (Co) x (SiO 2 ) 1 − x nanocomposite systems have been investigated over a wide range of Co concentrations using small‐angle neutron scattering in combination with magnetic, magneto‐optic, and magneto‐transport characterization. It was found that in the region of structural percolation ( x = 0.46...0.6 ) , the characteristics of magnetically correlated clusters are several times larger than the structural size of Co granules. Starting from the percolation point, the spatial distribution of magnetic nanoclusters can be described by the surface fractal model. With further growth of cobalt concentration x ≥ 0.67 the formation of three‐dimensional (3D) magnetic domains with typical sizes of 1.5 μm was observed.