Pulse magnetic field

Research in pulse magnetic field

Volodymyr M. Savytskyi savitsky@ilt.kharkov.ua	Head of group, Research Fellow, Candidate of Sciences (PhD).
Volodymyr M. Khrustalyov khrustalyov@ilt.kharkov.ua	Junior Research Fellow, Candidate of Sciences (PhD).

Low temperature studies of magnetic field induced spin-orientational phase transitions in antiferromagnets with strong magnetic anisotropy.
Experimental studies of magnetic and electric properties of multiferroic compounds under high pulsed magnetic field.

The phase (Н,Т)-diagrams of magnetic states for LiCoPO₄ in magnetic field up to 285 kOe has been constructed. The second high-field phase (H > H₂) has been found to be non-centrosymmetrical with magnetoelectric response (V.M. Khrustalyov, V.N. Savytsky, and M.F. Kharchenko, "(H,T_i)-diagram of magnetic transformations induced by a pulsed magnetic field in antiferromagnetic LiCoPO₄", Low Temp. Phys. V.43, 1332 (2017)).
The new high-field magnetic phase in LiCoPO₄ has been found within the field interval 21-28.5 T and was showed that transition from antiferromagnetic to saturated paramagnetic state occurs through three phase transitions. The possible magnetic structures formed in LiCoPO₄ in high-field phases (H > H₁) are proposed within the framework of the simplified two-dimensional collinear model (N.F. Kharchenko, V.M. Khrustalev, and V.N. Savitskii, "Magnetic field induced spin reorientation in the strongly anisotropic antiferromagnetic crystal LiCoPO₄, Low Temp. Phys. V.36, No6, 558 (2010)).
The five phase transitions has been found in LiNiPO₄ during pulse magnetization in the field up to 285 kOe. The phase (Н,Т)-diagrams in magnetic field up to 285 kOe has been constructed (V.M. Khrustalyov, V.N. Savitsky, N.F.Kharchenko, "Multi-step-like magnetization of LiNiPO₄ in a pulse magnetic field", Czechoslovak Journal of Physics. Suppl., V.54, No4, 27 (2004)).

The pulse magnet with field strenght up to 300 kOe within the hole diameter 27 mm (copper wired multilayer coil with liquid nitrogen cooling) for magnetization (differential magnetic susceptibility) and magnetoelectric effect measurements. Magnetic field pulse diration 30 ms. Sample temperature intervals: 1,6-4,2 К (liquid helium), 14-20,4 К (liquid hydrogen).
DC superconducting magnet with field up to 6 Т for magnetization and magnetic susceptibility measurement in the tempereture interval 1.6 - 300 K.
DC water-cooled magnet with field up to 1.5 T for magnetic properties measurements at room and helium temperatures.