Nonlinear Transport and Magnetic/Magneto-Optical Properties of Co[sub.x][sub.100-x] Nanostructures

• Published in: Applied sciences 2023-02, Vol.13 (5)
• Main Authors: Ivkov, Sergey A, Barkov, Konstantin A, Domashevskaya, Evelina P, Ganshina, Elena A, Goloshchapov, Dmitry L, Ryabtsev, Stanislav V, Sitnikov, Alexander V, Seredin, Pavel V
• Format: Article
• Language: English
• Subjects: Analysis; Cobalt; Magnetic fields; Optical properties
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app13052992

The aim of this work was to comprehensively study the effect of the variable atomic composition and structural-phase state of Co[sub.x](MgF[sub.2])[sub.100-x] nanocomposites on their nonlinear transport and magnetic/magneto-optical properties. Micrometer-thick nanocomposite layers on glass substrates were obtained by means of ion-beam sputtering of a composite target in the argon atmosphere in a wide range of compositions (x = 16-59 at.%). Using a low metal content in the nanocomposite, magnesium fluoride was kept in the nanocrystalline state. As the metal content increased, nanocrystalline cobalt was formed. The value of the resistive percolation threshold, x[sub.per] = 37 at.%, determined from the concentration dependences of the electrical resistance of the nanocomposites coincided with the beginning of nucleation of the metallic nanocrystals in the MgF[sub.2] dielectric matrix. The absolute value of the maximum negative magnetoresistive effect in the nanocomposites was 5% in a magnetic field of 5.5 kG at a Co concentration of x = 27 at.%.