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Title: Transport, Magnetic, and Memristive Properties of a Nanogranular (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} Composite Material

Abstract

The properties of (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} nanocomposite films with a ferromagnetic alloy content x = 6–48 at % are comprehensively studied. The films are shown to consist of ensembles of CoFe granules 2–4 nm in size, which are strongly elongated (up to 10–15 nm) in the nanocomposite growth direction and are located in an LiNbO{sub y} matrix with a high content of Fe{sup 2+} and Co{sup 2+} magnetic ions (up to 3 × 1022 cm{sup –3}). At T ≤ 25 K, a paramagnetic component of the magnetization of nanocomposites is detected along with a ferromagnetic component, and the contribution of the former component is threefold that of the latter. A hysteresis of the magnetization is observed below the percolation threshold up to x ≈ 33 at %, which indicates the appearance of a superferromagnetic order in the nanocomposites. The temperature dependence of the electrical conductivity of the nanocomposites in the range T ≈ 10–200 K on the metallic side of the metal–insulator transition (44 at % < x < 48 at %) is described by a logarithmic law σ(T) ∝ lnT. This law changes into the law of “1/2” at x ≤ 40 at %. The tunneling anomalous Hallmore » effect is strongly suppressed and the longitudinal conductivity turns out to be lower than in a (CoFeB){sub x}(AlO{sub y}){sub 100–x} composite material by an order of magnitude. The capacitor structures based on (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} films exhibit resistive switching effects. They are related to (i) the formation of isolated chains of elongated granules and an anomalously strong decrease in the resistance in fields E > 10{sup 4} V/cm because of the suppression of Coulomb blockage effects and the generation of oxygen vacancies V{sub O} and (ii) the injection (or extraction) of V{sub O} vacancies (depending on the sign of voltage) into a strongly oxidized layer in the nanocomposites, which is located near an electrode of the structure and controls its resistance. The number of stable resistive switchings exceeds 10{sup 5} at a resistance ratio R{sub off}/R{sub on} ~ 50.« less

Authors:
; ; ;  [1];  [2]; ; ; ; ; ;  [1];  [3];  [2];  [4];  [1];  [5]
  1. National Research Centre “Kurchatov Institute,” (Russian Federation)
  2. Voronezh State Technical University (Russian Federation)
  3. Russian Academy of Sciences, Fryazino Branch, Kotelnikov Institute of Radio Engineering and Electronics (Russian Federation)
  4. Moscow State University (Russian Federation)
  5. Moscow Institute of Physics and Technology (Russian Federation)
Publication Date:
OSTI Identifier:
22749979
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 3; Other Information: Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; ALLOYS; CMS DETECTOR; COBALT IONS; COMPOSITE MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; FILMS; HALL EFFECT; IRON IONS; MAGNETIZATION; NANOCOMPOSITES; TEMPERATURE DEPENDENCE; TUNNEL EFFECT

Citation Formats

Rylkov, V. V., E-mail: vvrylkov@mail.ru, Nikolaev, S. N., Demin, V. A., Emelyanov, A. V., Sitnikov, A. V., Nikiruy, K. E., Levanov, V. A., Presnyakov, M. Yu., Taldenkov, A. N., Vasiliev, A. L., Chernoglazov, K. Yu., Vedeneev, A. S., Kalinin, Yu. E., Granovsky, A. B., Tugushev, V. V., and Bugaev, A. S. Transport, Magnetic, and Memristive Properties of a Nanogranular (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} Composite Material. United States: N. p., 2018. Web. doi:10.1134/S1063776118020152.
Rylkov, V. V., E-mail: vvrylkov@mail.ru, Nikolaev, S. N., Demin, V. A., Emelyanov, A. V., Sitnikov, A. V., Nikiruy, K. E., Levanov, V. A., Presnyakov, M. Yu., Taldenkov, A. N., Vasiliev, A. L., Chernoglazov, K. Yu., Vedeneev, A. S., Kalinin, Yu. E., Granovsky, A. B., Tugushev, V. V., & Bugaev, A. S. Transport, Magnetic, and Memristive Properties of a Nanogranular (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} Composite Material. United States. doi:10.1134/S1063776118020152.
Rylkov, V. V., E-mail: vvrylkov@mail.ru, Nikolaev, S. N., Demin, V. A., Emelyanov, A. V., Sitnikov, A. V., Nikiruy, K. E., Levanov, V. A., Presnyakov, M. Yu., Taldenkov, A. N., Vasiliev, A. L., Chernoglazov, K. Yu., Vedeneev, A. S., Kalinin, Yu. E., Granovsky, A. B., Tugushev, V. V., and Bugaev, A. S. Thu . "Transport, Magnetic, and Memristive Properties of a Nanogranular (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} Composite Material". United States. doi:10.1134/S1063776118020152.
@article{osti_22749979,
title = {Transport, Magnetic, and Memristive Properties of a Nanogranular (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} Composite Material},
author = {Rylkov, V. V., E-mail: vvrylkov@mail.ru and Nikolaev, S. N. and Demin, V. A. and Emelyanov, A. V. and Sitnikov, A. V. and Nikiruy, K. E. and Levanov, V. A. and Presnyakov, M. Yu. and Taldenkov, A. N. and Vasiliev, A. L. and Chernoglazov, K. Yu. and Vedeneev, A. S. and Kalinin, Yu. E. and Granovsky, A. B. and Tugushev, V. V. and Bugaev, A. S.},
abstractNote = {The properties of (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} nanocomposite films with a ferromagnetic alloy content x = 6–48 at % are comprehensively studied. The films are shown to consist of ensembles of CoFe granules 2–4 nm in size, which are strongly elongated (up to 10–15 nm) in the nanocomposite growth direction and are located in an LiNbO{sub y} matrix with a high content of Fe{sup 2+} and Co{sup 2+} magnetic ions (up to 3 × 1022 cm{sup –3}). At T ≤ 25 K, a paramagnetic component of the magnetization of nanocomposites is detected along with a ferromagnetic component, and the contribution of the former component is threefold that of the latter. A hysteresis of the magnetization is observed below the percolation threshold up to x ≈ 33 at %, which indicates the appearance of a superferromagnetic order in the nanocomposites. The temperature dependence of the electrical conductivity of the nanocomposites in the range T ≈ 10–200 K on the metallic side of the metal–insulator transition (44 at % < x < 48 at %) is described by a logarithmic law σ(T) ∝ lnT. This law changes into the law of “1/2” at x ≤ 40 at %. The tunneling anomalous Hall effect is strongly suppressed and the longitudinal conductivity turns out to be lower than in a (CoFeB){sub x}(AlO{sub y}){sub 100–x} composite material by an order of magnitude. The capacitor structures based on (CoFeB){sub x}(LiNbO{sub y}){sub 100–x} films exhibit resistive switching effects. They are related to (i) the formation of isolated chains of elongated granules and an anomalously strong decrease in the resistance in fields E > 10{sup 4} V/cm because of the suppression of Coulomb blockage effects and the generation of oxygen vacancies V{sub O} and (ii) the injection (or extraction) of V{sub O} vacancies (depending on the sign of voltage) into a strongly oxidized layer in the nanocomposites, which is located near an electrode of the structure and controls its resistance. The number of stable resistive switchings exceeds 10{sup 5} at a resistance ratio R{sub off}/R{sub on} ~ 50.},
doi = {10.1134/S1063776118020152},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 3,
volume = 126,
place = {United States},
year = {2018},
month = {3}
}