Temperature and magnetic field dependences of the magnetization of LiHoF₄ and LiDyF₄ single crystals were measured with a dc-SQUID magnetometer MPSM-2 (Quantum Design) with the magnetic field applied along and perpendicular to the c axis. Experimental data are well reproduced by simulations based on the microscopic model of the crystal field and magnetoelastic interactions.

The inhibitory effect of widely used drug dimephosphon on water transport in human red cells at 37?C was studied in comparison to intact human erythrocytes. Intracellular water residence time characterizing water permeability of cell membrane was obtained with doping NMR technique. Inhibitory effect of dimephosphon is concentration-dependent.

Multiple quantum (MQ) NMR dynamics in a system which was prepared initially in dipolar ordered state is investigated with analytical and numerical methods for linear open chains of nuclear spins 1/2 coupled by dipole-dipole interactions. We show that the phases of the signals of MQ coherences are shifted by p/2 with respect to the signals of the ordinary MQ NMR experiment. The sum of the intensities of MQ coherences of arbitrary opposite orders in this experiment is equal to zero. Many-spin correlations are created faster in the such experiments and can be used for investigations of many-spin dynamics of nuclear spins in solids.

Multiple quantum (MQ) Spin-polarized EPR spectra of fullerene C₆₀ dissolved in glassy ortho-terphenyl was measured in the temperature range of 80 - 240K. The temperature dependence of the spectra was successfully simulated using the model of fast pseudorotation of ³C₆₀ in a potential created by the surrounding solvent molecules. The strength of this potential was estimated at different temperatures. Near 240K this potential was found to decrease remarkably.

A number of five-coordinated paramagnetic pincer nickel complexes have been obtained and investigated by X-band EPR spectroscopy. In general, these complexes can exist in solution as a pair of interconverting structure isomers. Activation parameters of this interconversion were estimated for several complexes.

The analysis of the ``astronium'' carbonizate powder surfaces with different particle dimensions are carried out. The behaviors of surface paramagnetic centers have been investigated by EPR method, it was established, that this behaviors depends on nature of the surfaces. The correlation of spin-lattice relaxation time of ³He nuclei and concentration of paramagnetic centers on surface of carbonizate was found

NMR investigation of magnetic structure and phase transitions in two isostructural quasi-one-dimensional cuprates LiCu₂O₂ and NaCu₂O₂ has been performed. While LiCu₂O₂ exhibits a magnetic phase transition at T_c = 24 K, NaCu₂O₂ orders magnetically at around 13 K. ^6,7Li and ²³Na NMR spectra in LiCu₂O₂ and NaCu₂O₂, respectively, provide an unambiguous experimental evidence that below T_c an incommensurate in-chain helical spin structure is established in both compounds. However, the features of the observed low temperature NMR are different pointing to different properties of the helical magnetic structure.

We investigate entanglement of spin pairs in a one-dimension open chain of spins coupled by the dipole-dipole interactions (DDI) in the equilibrium state in the external magnetic field. We suggest a method of calculation of the reduced density matrix. Concurrence, the quantitative measure of the entanglement, is estimated with Wootter's criteria. Analytical and numerical methods are used in order to investigate the influence of the temperature, chain's length, distance between the spins and their distance from the chain's ends on their entanglement.

The study of row heavy oil samples from Tatarstan and Vietnam oil wells was done by solid-echo nuclear magnetic resonance (NMR) technique on the hydrogen nuclei. For the first time in the oil study, the component with short spin-spin relaxation time (T_2s = 9.8-31.2 ms) and free induction decay (FID) shape similar to a solid one was detected for all oil samples. Density 𝜌, "zero" viscosity 𝜂₀, asphaltene content and solid part P_S of ¹H NMR signal were measured for whole row oil samples. The correlation between the part P_S of ¹H NMR signal and oil density r was found for samples of Tatarstan oil, by the other hand, data for samples of Vietnam oil did not show the correlation. No correlation dependences of the part P_S of ¹H NMR signal and "zero" viscosity 𝜂₀ from asphaltene amount for whole row of oil samples were confirmed, that indicates other crystalline supramolecular structures (more probably, crystalline paraffin) existence in the oil. As a main result, the correlation between oil viscosity and the amount of the solid-like structures in it was found. The significant differences of the solid-echo signal shapes and spin-spin relaxation times of the solid-like structures were obtained for the different oil samples, that demands additional studies.

We inform an opportunity of a laser synthesis of the diluted magnetic semiconductors on the basis of germanium and silicon, doped by manganese or iron till 10-15 at. %. Thin 50-110 nanometers thickness layers Ge and Si were grown on heated up to 200-480?C monocrystal substrates of gallium arsenide or sapphire. The content of a 3d-impurity was measured by x-ray spectral method. The ferromagnetism of layers, high magnetic and acceptor activity of Mn in Ge, of Mn and Fe in Si were appeared in observation at 77-500 K of Kerr effect, abnormal Hall effect, high hole conductivity and anisotropic ferromagnetic resonance (FMR). On the FMR data the Curie point of Ge:Mn , Si:Mn on GaAs substrates and Si:Fe on Al₂O₃ were not lower 420, 500 and 220 K, respectively.

The results of a numerical calculation of the contribution of ligand superhyperfine interactions to the line width for the phosphorus donor electron in silicon are reported and show linear behavior at lower concentrations compared to deep centers. The linear dependence for the phosphorus center in silicon predicts an electron spin-relaxation time for isotopically purified ²⁸Si:P longer than expected on the basis of the common square-root law. The spin-lattice relaxation processes in chromium doped silicon samples enriched by ²⁸Si isotope and with natural isotopic abundances were studied.