Discovery of Polarization Flop Transition and Simultaneous Measurements of Magnetic Ordering and Dielectric Properties of TmMn<SUB>2</SUB>O<SUB>5</SUB>
Access this Article
We have performed simultaneous measurements of magnetic neutron diffraction, ferroelectric <I>D</I>–<I>E</I> hysteresis loops and permittivity along the <I>b</I>- and <I>a</I>-axes of multiferroic TmMn<SUB>2</SUB>O<SUB>5</SUB> down to 2.5 K. It was confirmed that the permittivity peak coincides with an increase in both the polarization along the <I>b</I>-axis and a magnetic commensurate phase, which agrees with a previous similar experiment on ErMn<SUB>2</SUB>O<SUB>5</SUB>. We also discovered a polarization flop from the <I>b</I>-axis to the <I>a</I>-axis below 5 K coincident with a magnetic phase transition from one incommensurate phase to another incommensurate phase, which was confirmed by the simultaneous measurements. Although both phases are almost equivalent in the magnetic propagation wave vector, different magnetic structures induce a completely different ferroelectricity. Ferroelectric hysteresis loops along both the <I>b</I>- and <I>a</I>-axes were clearly observed by the double-wave method.
- Journal of the Physical Society of Japan
Journal of the Physical Society of Japan 77(9), 094711-094711, 2008
THE PHYSICAL SOCIETY OF JAPAN