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Electronic Transport and Magnetic Properties of Co/SiO 2 Magnetic Nanocomposites
Author(s) -
Radchenko Mykhailo,
Lashkarev Georgii,
Baibara Oleksii,
Bugaiova Maryna,
Stelmakh Yaroslav,
Krushynska Larysa,
Foltyn Marek,
Knoff Wojciech,
Story Tomasz,
Nedelko Natalia,
ŚlawskaWaniewska Anna
Publication year - 2019
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.201900145
Subject(s) - materials science , crystallite , nanocomposite , antiferromagnetism , ferromagnetism , electrical resistivity and conductivity , condensed matter physics , chemical vapor deposition , cobalt , magnetic nanoparticles , nanoparticle , dielectric , analytical chemistry (journal) , nanotechnology , chemistry , metallurgy , physics , optoelectronics , engineering , chromatography , electrical engineering
Electric, thermoelectric, and magnetic properties of the magnetic nanocomposite (MNC) Co/SiO 2 consisting of nanometer‐size Co nanoparticles embedded in SiO 2 dielectric matrix have been studied. MNC is obtained in the form of (0.8–2.3) μm thick films with Co concentration 31.7–65.4 at.% by the electron beam physical vapor deposition method on polycrystalline Al 2 O 3 substrates. The temperature dependence of the resistivity follows the Mott law. The negative magnetothermoelectric power discovered in MNC Co/SiO 2 can be explained by hopping conductivity through the magnetic localization centers in the SiO 2 matrix or chemical interaction of Co with Si and O 2 , which results in a mixture of CoSi (ferromagnetic) and CoO (antiferromagnetic) phases. As the cobalt concentration increases, the particle size increases and the interparticle distances decrease. This is confirmed by the magnetic behavior of the sample with high Co concentration, which is dominated by large Co nanoparticles and strong interparticle magnetic interactions.