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Information × Registration Number 0206U004632, 0103U003626 , R & D reports Title Magnetic resonance and electric transport in nonhomogeneous magnetics popup.stage_title Head Berzhansky Vladimir Naumovich, Registration Date 06-03-2006 Organization National Taurida V. Vernadsky University popup.description2 The working mock-up of the coherent NMR spectrometer for the study of magnetic materials in the frequency range of 20-200 MHz has been built. The peculiarities of the coherent excitation of nuclear spin echo in Y3Fe5O12 films have been studied for the first time. NMR and electrical properties of series of the chromium halcogenide spinels of ACr2X4 have been investigated. It was shown that the type of ligand X and the presence of transition metals ions in tetra positions are the main factors, which determine hyperfine fields on 53Cr nuclei and exchange interactions in studied spinels. It was established that the diamagnetic doping or deviation from stechiometry result in modifications of electrical and spectral properties and spin dynamics of chromium spinels caused by appearance of jahn-teller ions and ions of strong spin-orbital coupling. The oscillations of multiquantum nuclear echo have been observed in such crystals. The nuclear relaxation in half-metallic compounds of CrO2 and CuCr2S4 withhigh concentration of spin polarized electrons has been studied for the first time. It was established that the doped CuCr2S4:Sb demonstrates transition to semiconductive type of conductivity with small activation energy. It was shown that the basic mechanism of magnetoconductivity in oxide ferrimagnetic semiconductors is dependence of kinetic processes from the type of band for charge carriers transfer. Product Description popup.authors popup.nrat_date 2020-04-02 Close