About the reason of electric polarization flop in TbMnO3

The phenomenological analysis of incommensurate magnetic states in multiferroic TbMnO3 in magnetic field along the modulation wave vector is provided. The incommensurate state of manganese spins after the polarization flop (reorientation of electric polarization by 90°) is assumed. The key role of m...

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Bibliographic Details
Published in:Applied physics letters 2013-10, Vol.103 (18)
Main Authors: Chupis, I. E., Kovtun, H. A.
Format: Article
Language:English
Subjects:
Anisotropy
Electric polarization
Magnetic fields
Manganese
Mathematical analysis
Modulation
Phase diagrams
Polarization
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Summary:The phenomenological analysis of incommensurate magnetic states in multiferroic TbMnO3 in magnetic field along the modulation wave vector is provided. The incommensurate state of manganese spins after the polarization flop (reorientation of electric polarization by 90°) is assumed. The key role of magnetic anisotropic energy of the fourth order in polarization flop and existence of tricritical point on the phase diagram is shown. The competition between different terms of the fourth order of anisotropic energy is a reason of the reorientation of spin cycloid plane, leading to polarization flop. Calculated phase diagram is in a good agreement with the experimental data.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4824929