Scientific school of Physics of magnetostructural transformations of V. V. Kokorin
Volodymyr V. Kokorin (1942-2021) – Doctor of Science in Physics and Mathematics (1979), Professor (1989). Laureate of the State Prize of Ukraine in Science and Technology (1993), Kurdyumov Prize of the National Academy of Sciences of Ukraine (2010). He graduated from the Kyiv Polytechnic Institute (1964). From 1964 to 1996 he worked at the G.V. Kurdyumov Institute of Metallophysics of the National Academy of Sciences of Ukraine: 1986-1996 - Head of the Department of High Pressure Physics. Since 1996 he has worked at the Institute of Magnetism of the National Academy of Sciences of Ukraine and the Ministry of Education and Science of Ukraine: 1996-2016 - Head of the Department of Magnetostructural Transformations, 2016-2021 - Principal researcher of the Department of Physics of Meso- and Nanocrystalline Magnetic Structures.
V.V. Kokorin is an outstanding experimental physicist with a wide range of scientific interests in the field of applied metal physics and solid state physics. To summarize his achievements very briefly, it should be noted that he pioneered a new promising field in solid state physics that combines the physics of phase transformations and the physics of magnetic phenomena in alloys. This allowed him to propose a number of fundamentally new materials, including new magnetic alloys based on iron, namely shape memory steels. Previously, it was believed that it was impossible to create conditions for thermoelastic martensitic transformation in steels, but V. Kokorin experimentally proved the existence of such transformation in steels with the chemical composition he invented. He also revealed the nature of the significant tetragonality of the martensite crystal lattice, which is a prerequisite for thermoelastic transformation in iron alloys with a heterogeneous concentration distribution.
Much attention in his work was paid to the search for ferromagnetic alloys with martensitic transformations and shape memory, in which the low-temperature phase has a mobile twin structure with low surface energy of twin boundaries. As a result, a ferromagnetic Ni-Mn-Ga alloy with record-breaking nanotwin mobility was discovered, which gave rise to a new direction based on the phenomenon of twin boundary motion under the influence of a homogeneous magnetic field. It was in such alloys that a group of researchers with his participation discovered magnetoplastic deformation.
The Ni-Mn-Ga alloy invented by V.V. Kokorin has been the subject of many studies in various laboratories around the world, which has led to thousands of publications in leading international physical journals referring to V.V. Kokorin's priority works. He is recognized in the world scientific community as a specialist in the study of ferromagnetic Heusler alloys and their behavior in external fields. By the number of citations of his works, he is among the most cited authors in Ukraine in the field of physics.
V.V. Kokorin had his own scientific style of work, a broad scientific outlook that allowed him to highlight the main scientific ideas and results in the related fields of metal physics and metallurgy. In the last years, international cooperation with scientists from the USA, Germany, Japan, Switzerland and Spain has played an important role in the work of the department he headed. V.V. Kokorin is the author of more than 200 scientific articles and a monograph “Martensitic Transformations in Heterogeneous Solid Solutions”. V.V. Kokorin is a world-class scientist who is well known in the scientific community related to research in the field of applied physics. A significant place in his scientific activity was occupied by the practical use of the results obtained. He is a co-author of 22 certificates and two patents of Ukraine for alloys, technological methods and devices.
Professor Kokorin trained nine PhDs and two Doctors of Science. Subsequently, fate scattered them in different parts of the world, some of them changed their studies to entrepreneurial activities, but none of them was lost.
PhD in Physics and Mathematics:
1. Gunko L.P. (Institute of Magnetism, Ukraine)
2. Cherepov S.V. (Institute of Magnetism, Ukraine)
3. Kozlova L.Ye. (Institute of Magnetism, Ukraine)
4. Minkov O.V. (lives and works in Germany)
5. Zakrevskyi I.G. (Head of the company NSPI (national system of innovation promotion), LLC "ALL BIZ")
6. Shevchenko O.M. (Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine)
7. Konoplyuk S.M. (Institute of Magnetism, Ukraine)
8. Titenko A.M. (Institute of Magnetism, Ukraine)
9. Semenova Yu.S. (Institute of Magnetism, Ukraine)
Doctors of Physical and Mathematical Sciences:
1. Konoplyuk S.M. (Institute of Magnetism, Ukraine)
2. Kolomiets O.V. (Lviv Polytechnic National University)
V.V. Kokorin's entire life was devoted to science. The field of physics of martensitic materials, which he founded, is now being actively developed by his students and colleagues. One of his best students, Volodymyr Chernenko, now works at the University of the Basque Country, Bilbao, Spain. V.V. Kokorin's colleagues, PhDs in Physics and Mathematics Larysa Kozlova, Anatolii Titenko, and Doctors of Science in Physics and Mathematics Volodymyr Golub, Anna Kosogor, and Sergii Konopliuk continue their experimental and theoretical research in the field of physics of phase transformations of ferromagnetic alloys with memory effect, using the basic ideas defined by V.V. Kokorin.