Magnetiс materials with magnetoelectric
interactions (multiferroics)

Group Leader:
Yuri F. Popov ,
Associate Professor, Ph.D.

Research: The group performs studies of magnetoelectric interactions which provide the unique properties and multiple phase transitions in lanthanide magnetic materials. The main goal is the search of new effects arising due to the influence of magnetoelectric interactions . The main field of research is the study of new effects and types of spin ordering, which result from the interaction of magnetic and electrical subsystems in multiferroics . One of the fundamental problems is the study of the new phenomenon discovered in our group - spontaneous toroidal spin ordering, induced by magnetic field, which manifests itself in multiferroics with special symmetry. We investigate new mechanisms which form non-collinear , non-coplanar and toroidal spin structures in magnetoelectrics. Also we study spontaneous magnetic and structural phase transitions induced by a strong magnetic field up to 300 kOe, which redesign and destroy modulated spin structure and cause dramatic changes in magnetoelectric properties.
Sergey S. Krotov, Prof. Dr. Sci.;
Gennagy P. Vorobyev, senior researcher, Ph.D.; Citation index (WoS)
Dmitry V. Belov, associate Professor, Ph.D.;
Kamil I. Kamilov, senior Lecturer, Ph.D.;
Vladimir I. Zverev, Post-doc, Ph.D. Citation index (WoS)

Scientific collaboration:
General Physics Institute, Russian Academy of Sciences (Moscow);
Institute of Physics SB RAS (Krasnoyarsk) ;
DonIPhT (Donetsk, Ukraine);
CeNSCMR Dept. of Phys. and Astron., Seoul National University, Seoul, South Korea

Support: Russian Fund for Basic Research

Contact Information:
M.V. Lomonosov Moscow State University, Faculty of Physics, CKP, Laboratory of magnetic phenomena physics (119991 Moscow, Lenin Hills , 1, bld 35, room No. 204, 207)
Tel. : 8-495-939-11-42 (45)

Key publications:
A.M. Kadomtseva, Yu.F. Popov, G.P. Vorob'ev, N.V. Kostyuchenko, A.I. Popov, A.A. Mukhin, V. Yu. Ivanov, L.N. Bezmaternykh, I.A. Gudim, V.I. Temerov, A.P. Pyatakov, A.K. Zvezdin, High-temperature magnetoelectricity of terbium aluminum borate: The role of excited states of the rare-earth ion. Physical Review B 89, 014418 (2014 );
Urcelay-Olabarria, E. Ressouche, A.A. Mukhin, V.Yu. Ivanov, A.M. Balbashov, G, P, Vorob'ev, Yu.F. Popov, A.M. Kadomtseva, J.L. Garcia-Munoz and V. Skumryev, Neutron diffraction, magnetic, and magnetoelectric studies of phase transitions in multiferroic Mn0.90Co0.10WO4. Physical Review B 85, 094436 (2012);
A.A. Mukhin , G.P. Vorobyov, V.Yu. Ivanov, A.M. Kadomtseva, A.S. Narizhnaya, A.M. Kuzmenko, Y.F. Popov, L.N. Bezmaternykh, I.A. Gudim, Giant magnetodielectric effect in multiferroics SmFe3(BO3)4. JETP Letters, 93 (5) , 305-311 (2011)

Research results in recent years:
We first reported the magnetoelectric properties of rare-earth ferroborates. For example, in samarium ferroborate we discovered giant magnetodielectric effect (large electric polarization is controlled by the external magnetic field). It is found that, spontaneous electric polarization occurs together with the magnetic field induced electric polarization.
In Eu1-xHoxMnO3 (0 Experimental technique:
- Measurements of magnetic and magnetoelectric properties of crystals in pulsed magnetic fields up to 30 T and in the temperature range 4 - 350 K.
- Measurements of magnetocrystalline anisotropy and thermal expansion in static magnetic fields up to 2 T.
- Measurements of magnetodielectric and magnetoelectric effects by means of dynamic method in fields up to 4 T and in the temperature range 2-350 K.

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