Features of the Scaling of the Anomalous Hall Effect in (CoFeB)x(LiNbO3)100 − x Nanocomposite Films Below the Percolation Threshold: Manifestation of the Cotunneling Hall Conductance?
- Authors: Nikolaev S.N.1, Chernoglazov K.Y.1, Bugaev A.S.2,3, Granovskiy A.B.4,5, Ryl'kov V.V.1,3,5
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Affiliations:
- National Research Center Kurchatov Institute
- Moscow Institute of Physics and Technology (National Research University)
- Fryazino Branch, Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences
- Faculty of Physics, Moscow State University
- Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences
- Issue: Vol 118, No 7-8 (10) (2023)
- Pages: 519-525
- Section: Articles
- URL: https://vestnik.nvsu.ru/0370-274X/article/view/661563
- DOI: https://doi.org/10.31857/S1234567823190084
- EDN: https://elibrary.ru/XREJEB
- ID: 661563
Cite item
Abstract
A scaling behavior of the anomalous Hall effect resistivity ρAHE versus the longitudinal resistivity ρ in (CoFeB)x(LiNbO3)100 − x nanocomposites with a low content of dispersed Co and Fe atoms (Nd ~ 4 × 1020 cm−3) in an amorphous LiNbO3 matrix is studied in the range x ≈ 40–48 at % below the percolation threshold xp ≈ 49 at %. A logarithmic temperature dependence of the conductivity σ ~ lnT has been observed in the range x ≈ 44–48 at %, which is transformed in the range x ≈ 40–42 at % to a square root law lnσ ∝ ‒(T0/T)1/2, which is characteristic of cotunneling transport processes in nanocomposites. It has been found that the exponent n ≈ 0.24 in the scaling law ρAHE/x ∝ [ρ(x)]n coincides within an accuracy of 5% with the exponent n in a similar dependence for nanocomposites based on the (CoFeB)x(Al2O3)100 − x matrix with a high content Nd ~1021–1022 cm–3 and with the exponent n in a parametric dependence ρAHE ∝ [ρ(T)]n for the samples with the minimum content x ≈ 40 at %. The found features are attributed to the correlated change in the probability of cotunneling transitions in a set of more than three centers under the effect of spin–orbit coupling. The manifestation of the barrier tunneling anomalous Hall effect at granule interfaces is also p-ossible.
About the authors
S. N. Nikolaev
National Research Center Kurchatov Institute
Email: niklser@list.ru
123182, Moscow, Russia
K. Yu. Chernoglazov
National Research Center Kurchatov Institute
Email: niklser@list.ru
123182, Moscow, Russia
A. Sh. Bugaev
Moscow Institute of Physics and Technology (National Research University);Fryazino Branch, Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences
Email: niklser@list.ru
141701, Dolgoprudnyi, Moscow region, Russia;141190, Fryazino, Moscow region, Russia
A. B. Granovskiy
Faculty of Physics, Moscow State University;Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences
Email: niklser@list.ru
119991, Moscow, Russia;125412, Moscow, Russia
V. V. Ryl'kov
National Research Center Kurchatov Institute;Fryazino Branch, Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences;Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences
Author for correspondence.
Email: niklser@list.ru
123182, Moscow, Russia;141190, Fryazino, Moscow region, Russia;125412, Moscow, Russia
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