Polarization Switching Behavior of YMnO₃ Thin Film at around Magnetic Phase Transition Temperature

Abstract

The switching behavior of ferroelectric polarization of magnet ferroelectric YMnO₃ epitaxial films at around the Néel temperature was investigated to discuss the effect of antimagnetic ordring on the ferroelectric polarization behavior. The polarization-electric field (P-E) hysteresis loops of the films were measured in the frequency range from 1 Hz to 10 kHz and the temperature was varied from 10 to 150 K. Frequency dependence of coercive electric filed (Ec) accorded with Ishibashi-Orihara's theory at the measured temperature range. On the other hand, temperature dependence of Ec disagreed with Devonshire's theory below 120 K, which was close to the Néel temperature of the YMnO₃ epitaxial film.