Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 72, Issue 11, Pages 2959-2966Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.72.2959
Keywords
ferroelectronics; hexagonal YMnO3; domain wall; counpling of order-parameters; antiferromagnets; triangular lattice
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It has been experimentally confirmed that the ferroelectric (FEL) and anti ferro magnetic (AFM) order-parameter in hexagonal YMnO3 are coupled at the FEL domain boundary. A microscopic model for this clamping of the two order-parameters is proposed. The clamping can be understood as due to the change of exchange integrals induced by the spin-orbit interaction and low symmetry field within the FEL domain boundary and due to spin anisotropy energy which depends on the sign of FEL polarization.
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