Exploitable results
Electric field effects in magnetic resonance and magnetic properties of magnetic crystals: It was found that not only the linear but pronounced quadratic influence of the electric field on the magnetic susceptibility and antiferromagnetic resonance in the antiferromagnetic Gd2CuO4 exists. This influence is provided by the rear-earth magnetic subsystem and vanishes by heating the sample over the temperature of the Gd-subsystem ordering point. It is probably caused by the modulation of the exchange interaction by the electric field. The magnetic field around the antiferromagnetic sample of the Cr2O3 of the quadrupolar structure is found. The existence of this field was predicted by the theory of Dzyaloshinski for the crystal samples of the antiferromagnets allowing the linear magnetoelectric effect. The influence of the electric field on the high-frequency magnetic susceptibility is found at low temperatures in the spin-Peierls state of the monocrystal of CuGeO3. This magnetoelectric effect reveals the specific magnetic defects of the pure and perfect crystals after the transition in the spin-Peierls state.
Magnetic resonance in quasi one-dimensional structures: The magnetic resonance signal from Mn ions was found in the GHz frequency range in the quasi one-dimensional antiferromagnet CsMnBr3. The effect of the large "pulling" of the NMR frequency by the antiferromagnetic resonance frequency as well as the value of the intensive zero point quantum fluctuations if the one-dimensional nature is derived from these observations. The energy gap produced by the hyperfine interaction in the ESR spectrum in the quasi-one-dimensional antiferromagnet with the triangular structure CsMnBr3 was found and explained on the basis of fluctuationless spin hydrodynamics. The electron spin resonance in the quasi-one-dimensional spin-Peierls compound CuGeO3 in the pure and diamagnetically diluted monocrystals is carefully studied. The ESR signals ascribed to the pure matrix and to the paramagnetic defects were found in monocrystals prepared by different methods. The first observation of the antiferromagnetic resonance in the Zn - doped crystal is performed. From the spectrum of these resonance absorption the magnetic spin structure characterised by the easy, middle and hard directions of the spins alignment is derived. The anomalous shift of the gap in the antiferromagnetic resonance spectrum of the quasi-one-dimensional antiferromagnet CsNiCl3 was found at low concentrations of diamagnetic vacancies. This effect is much larger than the action of the diamagnetic impurities in 3-dimensional antiferromagnets.
Ferromagnetic multilayers: Ferromagnetic resonance acoustic mode for a series of multilayer structures (Fe(11A )/Ce(d))12 with different spacer thickness d was studied. These results allowed to determine the bilinear and biquadratic exchange constants for these samples.
Spinwave turbulence: The previous experiments with the nonuniform excitation of the spin system of the antiferromagnet and the spatial-temporal patterns of the spin wave turbulence in the antiferromagnet are described on the basis of the non-linear model involving effects of the non-linear spinwave spectrum renormalisation. Experiments with the high quality YIG-sphere at the non-linear FMR conditions showed the possibility of the nonuniform nonstationary structures in the ferromagnet sphere excited by microwave pumping.
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