CORRELATION OF ELECTRICAL, MAGNETIC AND GALVANOMAGNETIC PROPERTIES OF COMPOSITES PREPARED BY IMPLANTATION OF 3D-ELEMENTS IONS IN ZINC OXIDE
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Electrical, magnetic and galvanomagnetic properties of zinc oxide implanted by 3d-elements ions (Mn+, Fe+, Co+, Ni+) with energy 40 keV in dose range 1×1016–1,5×1017 sm-2 at ion current density 4 mА/sm2 have been investigated. The transition from insulating to metallic regimes of conductivity was observed at doze 1,5×1017 sm-2 and Co+ ions implantation only. At Fe+, Co+ and Ni+ ions implantation no transition was observed. Formation of magnetic inclusions at implantation leads to transition from superparamagnetic-to-ferromagnetic state. The mean cluster diameter for cobalt and nickel nanoparticles have been determined. It was shown that on the insulating side of the transition from insulating to metallic regimes magnetoresistive effect is determined by strong s-d-interaction which leads to spin-spleating of impurity states and change screaning radius and electron mobility in impurity sabbands with opposite spin direction. On the metallic side of the transition from insulating to metallic regimes in the regime of weak localization it demonstrates husterisis. It allows to conclude that magnetoresistive effect due to spin-dependent scattering of electrons by magnetic inclusions.
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