Anomalous Behavior of the Tunneling Magnetoresistance in (CoFeB)x(LiNbO3)100 − x/Si Nanocomposite Film Structures Below the Percolation Threshold: Manifestations of the Cotunneling and Exchange Effects

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Abstract

A strongly nonmonotonic temperature dependence of the magnetoresistance in (CoFeB)x(LiNbOy)100 – x film nanocomposites (x ≈ 40–48 at %) is observed in the temperature range of 3–250 K at the magnetic field up to 14 T near the percolation threshold on its insulating side. The magnetoresistance has a minimum at 40 K and increases steeply on cooling. Such behavior of the magnetoresistance is attributed to the coexistence of superferromagnetic regions with exchange-coupled granules separated by regions with superparamagnetic granules in the nanocomposite. In this case, an increase in the negative magnetoresistance at T > 40 K is due to the destruction of superferromagnetic ordering, whereas an increase in the magnetoresistance at T < 40 K is related to the processes involving simultaneous elastic tunneling via the chains of granules. At the saturation of the magnetization, an additional negative contribution arises, which is probably due to the quantum interference effects. At T < 4 K, a double-well shape of the field dependence of the magnetoresistance is observed, which could be attributed to the effect of a positive contribution that competes with the negative magnetoresistance.

About the authors

S. N. Nikolaev

National Research Centre Kurchatov Institute

Email: drovosekov@kapitza.ras.ru
Russian Federation, Moscow, 123182

K. Yu. Chernoglazov

National Research Center “Kurchatov Institute”

Email: onov@mail.ru
Russian Federation, Moscow, 123182

A. V. Emel'yanov

National Research Centre Kurchatov Institute

Email: vvrylkov@mail.ru
Moscow, 123182

A. V. Sitnikov

National Research Centre Kurchatov Institute;Voronezh State Technical University

Email: vvrylkov@mail.ru
Moscow, 123182;Voronezh, 394026 Russia

A. N. Taldenkov

Russian Research Centre “Kurchatov Institute,”

Email: box-n3@bk.ru
Russian Federation, pl. Kurchatova 1, Moscow, 123182

T. D. Patsaev

National Research Center Kurchatov Institute

Email: a.vasiliev56@gmail.com
Russian Federation, Moscow, 123182

A. L. Vasil'ev

National Research Centre Kurchatov Institute

Email: vvrylkov@mail.ru
Moscow, 123182 Russia

E. A. Gan'shina

Faculty of Physics, Moscow State University

Email: vvrylkov@mail.ru
Moscow, 119991 Russia

V. A. Demin

National Research Centre Kurchatov Institute

Author for correspondence.
Email: vvrylkov@mail.ru
Moscow, 123182 Russia

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