Structure
INSTITUTE OF METAL PHYSICS OF NASU.
Back

 
HISTORY AND RESEARCH ACTIVITY

Joint Magnetic Films Physics Laboratory of Ivano-Frankivsk State Pedagogical Institute and the G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukrainian SSR (hereinafter - Laboratory) was founded in 1988 on the basis of the laboratories of gamma- resonance spectroscopy with analysis of conversion electrons, gamma and X-ray emission and X-ray analysis (National Heritage status in Ukraine since 2011) of Ivano-Frankivsk State Pedagogical Institute. Since the date of its foundation the activity of the Laboratory has been connected with the fulfillment of the projects financing by the Ministry of Defense of the Ukrainian SSR (until 1990) and economic projects of the Ministry of Education and Science of Ukraine.

During the period of the eighties-nineties the researchers of the Laboratory obtained new results relating to the mechanisms of radioactive defects formation in monocrystalline epitaxial ferrite-garnet films (FGF), determined a crystallographic position of ions in the garnet structure before and after thermal annealing, proposed the dynamic model of the structure reduction of the FGF surface layer modified by ion irradiation. The measurements of time-frequency dependences of the electric and magnetic parameters of mono-and polycrystalline ferrite materials were conducted. New approaches to determination of the deformation profiles of the monocrystalline surface layers of magnetic and semiconducting materials based on the dynamic theory of the X-rays scattering were found. It allowed considerably increase the results reliability and to evaluate quantitatively the impact of mechanical stresses on technologically controlled parameters of fine films. The effects of a considerable increase of excitation intensity of the exchangeable spin waves in the field of ultrahigh frequencies in the near-surface layers which were modified by ion implantation and thermal-and-radioactive annealing of FGF were grounded. A nondestructive layer-by-layer metrology of structural and magnetic characteristics of monocrystalline ferrite films with heterogeneous field of mechanical stresses with the usage of X-ray, Y- resonance and NMR-methods was proposed. A scientific breakthrough in creation of new and improvement of existing technologies of polycrystalline ferrite materials synthesis with foreseen properties for the deviating systems of the electron-beam devices and other electromagnetic systems was realized. Since the late nineties the vector of the scientific-and-research activities of the Laboratory has been directed on development of methods of new functional nanomaterials obtaining with their further application in the power sources and molecular energy storage systems (supercapacitors) taking into account the world tendencies in science development. The research objectives have become: the technologies of the oxide nanomaterials obtaining, fundamental study and prediction of their physical-and-chemical properties.

At a new stage of the research it was shown that the main types of radiation defects formed in the near-surface layers of monocrystals GGG by ions implantation He+ (Ĺ = 100 keV) within doses 1⋅1015–1⋅1016 sm–2, are point defects and dislocation loops with average sizes 30–70 A. With the increasing of implantation dose the concentration of the dislocation loops increases and their radius decreases. The implantation of Si+ ions within the doses 1⋅1013–2⋅1014 sm–2 within the energy range 100–150 keV into the yttrium-iron garnet (YIG) films causes the formation of the dislocation loops with the radius 5 nm and spherical clusters with radius 10 nm. On the basis of the near-surface layer analysis of YIG films, in which the Si+ ions were implanted, the presence of Fe+ ions and a large amount of non-magnetic iron neighbours were determined using the XPS and KEMS methods.

The researchers of the Laboratory participate in many grants. The STCU project “Development of laser and combined intercalation methods for nanotechnologies of low-sized structures” was realized on the base of the Laboratory in 2004–2006. The execution of the joint Ukrainian-Polish project “Solar elements of the third generation: synthesis and materials properties”, Ukrainian–Chinese project “Nanodispersed rutile: obtaining, structure, electrochemical properties”, scientific-research project “Nanocomposites TiO2 as an active cathode material in power generation devices: Mössbauer reasearches", which was carried out in accordance with the Decree of the President of Ukraine "On granting President grants to support researches of young scientists in 2009", were fulfilled. The three projects funded under the goal-oriented program of fundamental researches NAS of Ukrainian ‘”Fundamental Problems of nanostructural systems, nanomaterials, nanotechnologies” for 2010–2014 are being fulfilled. On the basis of the results obtained in the Laboratory 24 Candidate's dissertations and 4 Doctoral theses were defended.