Transport, Magnetic, and Memristive Properties of a Nanogranular (CoFeB) x (LiNbO y )100-x Composite Material

被引：52

作者：

Rylkov, V. V. ^{[1
,5
]}

Nikolaev, S. N. ^{[1
]}

Demin, V. A. ^{[1
]}

Emelyanov, A. V. ^{[1
]}

Sitnikov, A. V. ^{[2
]}

Nikiruy, K. E. ^{[1
,3
]}

Levanov, V. A. ^{[1
,4
]}

Presnyakov, M. Yu. ^{[1
]}

Taldenkov, A. N. ^{[1
]}

Vasiliev, A. L. ^{[1
]}

Chernoglazov, K. Yu. ^{[1
]}

Vedeneev, A. S. ^{[5
]}

Kalinin, Yu. E. ^{[2
]}

Granovsky, A. B. ^{[4
]}

Tugushev, V. V. ^{[1
]}

Bugaev, A. S. ^{[3
,5
]}

机构：

[1] Natl Res Ctr Kurchatov Inst, Pl Kurchatova 1, Moscow 123182, Russia

[2] Voronezh State Tech Univ, Voronezh 394026, Russia

[3] Moscow Inst Phys & Technol, Inst Skii Per 9, Dolgoprudnyi 141700, Moscow Oblast, Russia

[4] Moscow MV Lomonosov State Univ, Moscow 119991, Russia

[5] Russian Acad Sci, Kotelnikov Inst Radio Engn & Elect, Fryazino Branch, Fryazino 141190, Moscow Oblast, Russia

来源：

JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2018年 / 126卷 / 03期

基金：

俄罗斯基础研究基金会; 俄罗斯科学基金会;

关键词：

CONDUCTIVITY; RESISTIVITY; RANGE; FILMS;

D O I：

10.1134/S1063776118020152

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The properties of (CoFeB) (x) (LiNbO (y) )(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 (y) matrix with a high content of Fe2+ and Co2+ magnetic ions (up to 3 x 1022 cm(-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 ae 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 ae 10-200 K on the metallic side of the metal-insulator transition (44 at % < x < 48 at %) is described by a logarithmic law sigma(T) ae 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) (x) (AlO (y) )(100-x) composite material by an order of magnitude. The capacitor structures based on (CoFeB) (x) (LiNbO (y) )(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(4) V/cm because of the suppression of Coulomb blockage effects and the generation of oxygen vacancies V (O) and (ii) the injection (or extraction) of V (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(5) at a resistance ratio R (off)/R (on) similar to 50.

引用

页码：353 / 367

页数：15

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