Department of Magnetism

Magneto-optical group



Members of the group:

  1. Gnatchenko S.L., Doctor of Sciences, professor, academician of NAS of Ukraine, head of the group
  2. Bedarev V.A., Candidate of Sciences (Ph.D), senior researcher
  3. Kachur I.S., Candidate of Sciences (Ph.D), senior researcher
  4. Merenkov D.N., Candidate of Sciences (Ph.D), researcher
  5. Piryatinskaya V.G., Candidate of Sciences (Ph.D), researcher
  6. Pashchenko M.I., Candidate of Sciences (Ph.D), junior researcher.

Main fields of research:

  • magneto-optical investigations of spontaneous and magnetic-field induced phase transitions, spin reorientation processes in magnetically ordered dielectrics, metallic magnetic superlattices and nanostructures;
  • magneto-optical and visual investigations of magnetically inhomogeneous states formed in the processes of phase transitions;
  • optical spectroscopy of magnetic dielectrics;
  • investigations of photoinduced phenomena in magnetic crystals;

The most important results:

  • observation of inhomogeneous states in the vicinity of magnetic-field induced phase transitions in antiferromagnets and ferrimagnets, investigation of their static and dynamic properties;
  • discovery of photoinduced linear birefringence and absorption in antiferromagnetic and paramagnetic manganese garnets; observation of photoinduced phase transitions in manganese oxides;
  • discovery of surface and bulk noncollinear structures induced by magnetic field in multilayer nanostructure films and superlattices;
  • discovery of the peculiarities of exciton-magnon optical absorption fine structure, caused by high density of states near the bottom of spin-wave band, in low-dimensional antiferromagnets.

Experimental equipment:

  • experimental magneto-optical setup for measuring linear and circular optical birefringence and visual investigation of domain structure in a visible spectral range in magnetic fields up to 50 kOe and at temperatures 5-300 K;
  • experimental magneto-optical setup for measuring polar and longitudinal Kerr effect in magnetic fields up to 50 kOe at temperatures 10-300 K with light wavelength 633 nm;
  • experimental setup for investigation of optical absorption spectra in the wavelength range 250-1200 nm at temperatures 1.7-300 K in stationary magnetic fields up to 70 kOe.

International collaboration:
Institute of Physics Polish Academy of Sciences, Warsaw, Poland; Argonne National Laboratory, Argonne, USA; University of Basque Country, San Sebastian, Spain; Kirensky Institute of Physics of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russia.

Recent publications:

  1. V.V. Eremenko, S.L. Gnatchenko, I.S. Kachur, V.G. Piryatinskaya, A.M. Ratner, and V.V. Shapiro. Photoproduction and relaxation of long-lived active charges in Ca3Mn2Ge3O12 garnet revealed through optical absorption. Phys. Rev. B, 2000, 61, N 16, pp. 10671-10676.
  2. A.B. Chizhik, K. Fronc, S.L. Gnatchenko, D.N. Merenkov, and R. Zuberek. Formation of noncollinear spin configurations during magnetization reversal Fe/Si films. J. Magn. Magn. Mater., 2000, 213, pp. 19-24.
  3. V.V.Eremenko, V.A.Karachevtsev, I.S.Kachur, N.Yu.Nedbailo, V.G. Piryatinskaya, V.V.Slavin, V.V.Shapiro. Absorption and luminescence of CsMnCl32H2O crystals doped with Cu2+. Journal of Luminescence, 2001, 92, pp.35-42.
  4. V.V. Eremenko, S.L. Gnatchenko, I.S. Kachur, V.G. Piryatinskaya, M.B. Kosmyna, B.P. Nazarenko, and V.M. Puzikov. Photoinduced optical absorption in Ca3Ga2Ge3O12:Mn garnet. Appl. Phys. Lett., 2001, 79, N 6, pp. 734-736.
  5. V.V. Eremenko, S.L. Gnatchenko, V.A. Bedarev, M. Baran, R. Szymczak, and H. Szymczak. Effect of light illumination on magnetic phase transitions in manganese oxides. Material Science Forum, 2001, 373 376, pp. 51-56.
  6. I.O. Shklyarevskiy, A.B. Chizhik, S.L. Gnatchenko, P.J.M. van Bentum, P.C.M. Christianen, J.C. Maan, K.V. Kamenev, G. Balakrishnan and D. McK Paul. Domain structure of the antiferromagnetic insulating state in Nd0.5Sr0.5MnO3. J. Magn.Magn. Mat., 2002, 238, N 2-3, pp. 140-144.
  7. M. Baran, V.A. Bedarev, J.-M. Desvignes, V.I. Gapon, S.L. Gnatchenko, H. Le Gall, and R. Szymczak. Photoinduced change of metamagnetic phase transition field in Ca3Mn2Ge3O12 garnet. Europhys. Lett., 2002, 57, N 6, pp. 898-903.
  8. A.B. Chizhik, S.L. Gnatchenko, M. Baran, K. Fronc, R. Szymczak, and R. Zuberek. Spontaneous and field induced magnetic configurations in a Fe/Si/Fe trilayer with ferromagnetic interlayer exchange. J. Phys.: Condensed Matter, 2002, 14, N 39, pp. 8969-8977.
  9. V.V. Eremenko, S.L. Gnatchenko, I.S. Kachur, V.G. Piryatinskaya, A.M. Ratner, M.B. Kosmyna, B.P. Nazarenko, V.M. Puzikov. Photoproduction of long-lived holes and electronic processes in intrinsic electric fields seen through photo-induced absorption and dichroism in Ca3Mn2Ge3O12 garnets. J. Phys.:Cond.Met., 2003, 15, N 23, pp. 4025-4044.
  10. D.N. Merenkov, A.B.Chizhik, S.L.Gnatchenko, Yu.A. Shakhayeva, M.Baran, R.Szymczak, V.O.Vas'kovskiy, A.V.Svalov. Coerciv properties of Gd/Si/Co multilayer with a compensation point. Fiz. Nizk. Temp., 2004, 30, N 2, pp. 193-197 (Low Temp. Phys., 2004, 30, N 2, pp. 140-143).
  11. P. Aleshkevych, M. Baran, .. , .. , .. , .. , .. , R. Szymczak, H. Szymczak. Pr0.6La0.1Ca0.3MnO3. Fiz. Nizk. Temp., 2004, 30, N 12, pp. 1261-1271 (Low Temp. Phys., 2004, 30, N 12, pp. 948-955).
  12. V.V. Eremenko, S.L. Gnatchenko, I.S. Kachur, V.G. Piryatinskaya, A.M. Ratner, M.B. Kosmyna, B.P. Nazarenko, V.M. Puzikov. Anomalous manifestation of long-lived photoinduced dichroism in NaCa2Mn2V3O12 garnet. Phys. Rev. B, 2004, 69, 23, p. 233102.
  13. D.N. Merenkov, S.L. Gnatchenko, A.N. Bludov, Yu.A. Shakhayeva, V.V. Pishko, M. Baran, R. Szymchak, V.A. Novosad. Asymmetrically shaped hysteresis loop in exchange-biased FeNi/FeMn film. J. Magn. Magn. Mat., 2006, 307, N 12, 263-267.
  14. D.N. Merenkov, S.L. Gnatchenko, A.N. Bludov, M. Baran, R. Szymchak, V.A. Novosad. Exchange anisotropy FeNi/FeMn films with hsteresis loop asymmetry. Fiz. Nizk. Temp., 2007, 33, N 11, pp. 1260-1270 (Low Temp. Phys., 2007, 33, N 11, pp. 957-964).
  15. A.V. Malakhovskii, I.S. Edelman, A.E. Sokolov, V.L. Temerov, S.L. Gnatchenko, I.S. Kachur, V.G. Piryatinskaya. Low temperature absorption spectra of Tm3+ ion in TmAl3(BO3)4 crystal. J. Alloys Comp., 2008, 459, 1-2, pp. 87-94.