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The Institute performs research in magnetism and magnetic materials, in the following focus areas:

Theory of Magnetism
Kinetic theory of magnons, solitons and breathers in the integrable magnetic systems along with their kinetic coefficients are formulated. Theory of the exchange relaxation of nonlinear magnetic waves in ferromagnets is developed. New methods to study the magnetic valve effect for layered magnetic structures are proposed.

Modern problems of Solid State Physics
Optimal methods to protect the Josephson analyzer head against the intensive electromagnetic radiation are proposed, with the use of magnetic and superconductor materials. Interaction effects of the intensive spin and electromagnetic waves in ferromagnets in vicinity of orientational phase transition are studied and the self-focusing and transverse modulation of electromagnetic waves is predicted in this case. An influence of acoustic waves on the orientational phase transition is shown to can change the type of the phase transition. Statistical-thermodynamics, electronic and strain-induced properties of the lattice systems with the long-range interatomic interactions are specified. Elaboration of the methods for calculations of the interatomic interaction (force and energy) parameters of statistical-thermodynamic description of the lattice system on the basis of the electronic theory (within the cluster modelling by Xa-SW method and FLAPW method for the calculations of the electronic structure of solids) taking into account the lattice distortions caused by the impurity components of system is performed. Calculations of the Fourier components of the interatomic potentials and strain-induced effects in substitutional (e. g. Fe-Cr), interstitial (e. g. Fe-N, Fe-C) and substitutional-interstitial (Fe-Cr-N and Fe-Cr-C) alloys. Calculations of the short-range order parameters and their Fourier components, configuration correlation radii for above-mentioned alloys. Analysis of the relation between the structural and mechanical properties of Fe-based alloys. Investigation of the electronic structure of complex oxides with the perovskite type structure. Interpretation of the experimental results (including XPS and X - ray emission and absorbtion spectra). HTS compounds (YBa2Cu3O7±d); Compounds A1-xMexMnO3 (A=La,Pr; Me=Sr,Ca,K); Compounds ATiO3 (A=Ba,Pb); Superionics compounds La1-xLixTiO3. A new cluster method to calculate the thermodynamic potential of the Ising model is proposed.

New Magnetic Materials
Fundamentals for fabrication of ultrahigh-density magnetic recording media have been developed. Features of the spin-dependent conductivity and tunneling effects in layered metallic magnetics have been specified. Regularities of the evolution of magnetic phase composition of the doped manganite thin films and manganite-based heterostructures have been determined. Magnetoelastic shape memory materials for a new class of acoustic transformers have been developed. Magnetic phase transformations in Cr-based alloys have been investigated.

Mathematical Physics
Theory of phase transition is formulated in terms of stable random variables by Levy. A theory of addition of the Kleinian hyperelliptic functions is developed and then applied to the integrability problem of nonlinear partial differential equations of evolution type. In the long Josephson junction a transmission of two-phase nonlinear electromagnetic waves is studied and the appropriate current-voltage characteristics are built by means of the Riemannian theta-functions.

Studies aimed at reduction of the consequences of Chernobyl nuclear power plant disaster
Program package, which realize multi-dimensional modeling methodology. A tool for 3D-mathematical modeling which is founded on principles of self-organisation allows us to construct sufficiently reliable 3D models of different geochemical and geophysical parameters on data with real level noise. This can be, for instance, a regional 3D model of fields of radionuclei pollutions or distribution of other geophysical parameters. All these sources of information are being included, by applying different confidence weights. These weights must reflect the reliability of data. Arbitrarily oriented sections of the parameters distribution are rather conveniently extracted from 3D model. Thus, the model not only serves as a regional data base for parameters, but also provides a tool for deeper studying of multi-dimensional fields. This would be for instance especially useful for the making of right decisions during the liquidation of the consequences of global catastrophes, such as Chornobyl, which cause the contamination of environment.

INSTITUTE OF MAGNETISM NASU and MESYSU 2013