About Institute
The Center of Shared Research Equipment
Department of Magnetostructural Transformations, Institute of Magnetism

Fields of Research

Department has been engaged in the studies of the phase and structural transformations in magnetic metal systems. The main direction of our investigations performed in last years has been related to the ferromagnetic shape memory alloys (preparation, structure characterization, magnetic and transport measurements, applications).

Main Scientific Results
A number of ferromagnetic shape memory alloys (FSMA) have been developed in recent years. The most popular achievements in this area are the elaboration of new Fe-Ni - based alloys (shape memory steels) and new alloys based on the compound Ni 2MnGa. The structure of Ni-Mn-Ga alloys can be ruled by magnetic field. The magnetic field induced plastic strain was observed for this alloy.
It is worthy to note that the magnetoplastic deformation (up to several per cents) takes place at the moderate fields (H=3 kOe). The first publication devoted to the description of the field induced strain in Ni-Mn-Ga alloy has the citation index 280 on the end of last year (2004). It reflects the significant interest in the world as to the above mentioned results.
In general, the using of ferromagnetic martensitic phases with mobile twin structure promises the wide opportunities for the technical applications.

Selected Papers
  • V.V. Kokorin, A.E. Perekos , T.V. Efimova. Magnetic properties of martensitic phases in Ni-Mn-Ga alloy. - Physics of Metals and Metallography, v.98 (2004), No.2, p.19.
  • V.A. Chernenko, V.A. Lvov, P. Mullner, G. Kostorz, T. Takagi. Magnetic-field-induced superelasticity of ferromagnetic thermoelastic martensites: experiment and modelling. - Phys. Rev. B. 69, (2004), p.134410.
  • V.V. Kokorin, A.N. Titenko, A.E. Perekos, T.V. Efimova. Transformations between martensitic phases in Ni-Mn-Ga alloy in magnetic field. - Physics of Metals and Metallography, v.95, No.6, (2003), p.1.
  • V.A. Chernenko, V.A. Lvov, S.P. Zagorodnyuk, T. Takagi. Ferromagnetism of thermoelastic martensites: theory and experiment. - Phys. Rev. B. 67, (2003), p.064407.
  • V.V. Kokorin, L.E. Kozlova, A.N. Titenko. Temperature hysteresis of martensitic transformation in aging Cu-Mn-Al alloy. - Scripta Materialia, v.47 (2002), p.499.
  • V.V. Kokorin, M. Wuttig. Magnetostriction in ferromagnetic shape memory alloys. - Journal of Magnetism and Magnetic Materials, v.234 (2001), p.25.
  • V.V. Kokorin. Magnetic field induced strain in ferromagnetic shape memory alloys. - Materials Science Forum, v.373-376 (2001), p.41.
  • U. Stuhr, P. Vorderwisch, V.V. Kokorin. Phonon softening in Ni2MnGa with high martensitic transition temperature. - Journal of Physics: Condensed Matter, v.12, (2000), p.7541.
  • H.D. Chopra, C. Ji, V.V. Kokorin. Magnetic field-induced twin boundary motion in magnetic shape-memory alloys. - Phys. Rev. B. 61, No.22 (2000), R 14913.
  • R. Tickle, R.D. James, T. Shield, M. Wuttig, V.V. Kokorin. Ferromagnetic Shape Memory in NiMnGa System. - IEEE Transactions on Magnetics, v.35, No.5 (1999), p.4301.
  • V.V. Kokorin. Structural phase transformations in Ni-Mn-Ga alloys. - Proceedings of Intern.Conf. on Phase Transformations, Kyoto (1999), Japan , Pt.2, p.1100.
  • V.V. Kokorin, L.P. Gunko, E.A. Belavina. Martensitic transformation in heterogeneous austenite. - Phase Transitions, v.69 (1999 ), p.467.
  • S.M. Konoplyuk, V.V. Kokorin. Spontaneous intermartensitiń transformations in Ni-Mn-Ga alloy. - Ukrainian Journal of Physics, v.43, No.10 (1998), c.1275.
  • U. Stuhr, P. Vorderwisch, V.V. Kokorin, P.A.Lindgard. Premartensitic phenomena in the ferro- and paramagnetic phases of Ni2MnGa. - Phys. Rev. B 56, No.22 (1997), p.14360.
  • L. Manosa, A. Planes, V.A. Chernenko, V.V. Kokorin, E. Cesari. Anomalies related to the TA2-phonon mode condensation in the Heusler Ni2MnGa alloy. - Phys. Rev. B 55, No.17 (1997), p.11068.
  • V.V. Kokorin, V.A. Chernenko, J. Pons, C. Segui, E. Cesari. Acoustic phonon mode condensation in Ni2MnGa compound. - Solid State Communications, v.101, No.1, (1997 ), p.7.
  • K. Ullakko , J.K. Huang, S. Kantner, V.V. Kokorin, R.C. O’Handley. Large magnetic-field-induced strain in Ni2MnGa single crystals. - Applied Physics Letters, v.69, No.13 (1996), p.1966.
  • A.N. Vasilyev, S.A. Klestov, R.Z. Levitin, V.V. Kokorin, V.A. Chernenko. Magnetoelastic interaction in Ni2MnGa single crystal. - JETP v.109, No.3 (1996), p.973.