Nontrivial Phenomena in Magnetic Nanocomposites Co/Al2O3 and Co/SiO2

被引：1
|
作者：
Lashkarev, G. V. [1 ]
Radchenko, M. V. [1 ]
Baibara, A. E. [1 ]
Bugaiova, M. E. [1 ]
Petrosian, I. [1 ]
Dumond, Y. [2 ]
Story, T. [3 ]
Knoff, W. [3 ]
Nedelko, N. [3 ]
Slawska-Waniewska, A. [3 ]
Foltyn, M. [3 ]
Stelmakh, Y. A. [4 ]
Krushynskaya, L. A. [4 ]
机构：
[1] Natl Acad Sci Ukraine, IM Frantsevich Inst Problems Mat Sci, 3 Krzyzhanovsky, Kiev, Ukraine
[2] Univ Versailles St Quentin Yvelines, Lab GEMaC, Versailles, France
[3] Polish Acad Sci, Inst Phys, Al Lotnikow 32-46, Warsaw, Poland
[4] Natl Acad Sci Ukraine, EO Paton Inst Elect Welding, 68 Antonovich, Kiev, Ukraine
来源：
LOW TEMPERATURE PHYSICS | 2019年 / 45卷 / 02期
关键词：
ELECTRICAL-PROPERTIES; EXCHANGE BIAS;
D O I：
10.1063/1.5086418
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic nanocomposites (MNC), in which nanoparticles of ferromagnetic metals are distributed in wide-gap dielectric matrices (Al2O3 or SiO2), are prospective materials for electronics due to their amenability to technological control of the concentration and size of ferromagnetic nanoparticles. Co/Al2O3 and Co/SiO2 MNC layers with Co concentrations below the percolation threshold were deposited on polycor substrates using electron-beam deposition in a vacuum (EB-PVD). Scanning electron microscopy showed the presence of tightly packed Co grains of irregular shape with sizes of 5-50 nm in MNC. Low-temperature measurements of the magnetization for MNC Co/Al2O3 were made in the temperature range 4-300 K and magnetic fields up to 10 kOe. The 'magnetic exchange bias' has been detected, and it increases with a rise in Co concentration. By studying the electrical properties of the MNC Co/Al2O3 and Co/SiO2 in the temperature range of 77-280 K, the Mott type electron transport hopping mechanism was established. We first observed the effect of a giant positive thermoelectric power in a magnetic field in MNC Co/Al2O3 and the effect of a negative magnetothermoelectric power in a Co/SiO2. Published under license by AIP Publishing.
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收藏
页码：228 / 233
页数：6
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