NDLI: Conductivity and anomalous Hall effect in film magnetic nanocomposites based on nonstoichiometric oxides

Content Provider	Springer Nature Link
Author	Nikolaev, S. N. Cherglazov, K. Yu. Demin, V. A. Chumakov, N. K. Levav, V. A. Magomedova, A. A. Sitnikov, A. V. Kalinin, Yu. E. Gravskii, A. B. Rilkov, V. V.
Copyright Year	2017
Abstract	The transport properties of film nanocomposites (Co$_{40}$Fe$_{40}$B$_{20}$)$_{ x }$(AlO$_{ y }$)$_{100 − x }$ and (Co$_{84}$Nb$_{14}$Ta$_{2}$)$_{ x }$(AlO$_{ y }$)$_{100 − x }$ based on AlO$_{ y }$ oxide (y ~ 1), containing a ferromagnetic metal, are studied in the region of the metal–insulator transition (57 > x > 47 at %). It is found that at x > 49 at %, the conductivity of nanocomposites is well described by a logarithmic law of σ(T) = a + b ln T, which can be explained by the peculiarities of the Coulomb interaction in nanogranular systems with metallic conductivity near the metal—insulator transition. It is shown that parameter b is determined by the characteristic size of the percolation cluster cell, which in nanocomposites of both types happen to be the same (~8 nm) and correlates well with the results of electron microscopy studies. The temperature dependence of the anomalous Hall effect at the logarithmic dependence of conductivity is studied for the first time. In the immediate vicinity of the transition, a power-law scaling between the anomalous Hall resistance and longitudinal resistance ρ H a ∝ ρ$^{0.4}$, is detected, which can be explained by the suppression of its own mechanism of the anomalous Hall effect under the strong scattering of charge carriers.
Starting Page	549
Ending Page	553
Page Count	5
File Format	PDF
ISSN	10274510
Journal	Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques
Volume Number	11
Issue Number	3
e-ISSN	18197094
Language	English
Publisher	Pleiades Publishing
Publisher Date	2017-06-15
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	magnetic nanogranular composites metal–insulator transition conductivity anomalous Hall effect Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Surfaces, Coatings and Films

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