[17p-M_278-1~16] 6.1 Ferroelectric thin films

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[17p-M_278-1] [The 59th Young Scientist Presentation Award Speech] Domain-wall Pinning Effect on Pyroelectricity in Ferroelectrics

〇Jun Usami¹, Yuki Okamoto¹, Hisashi Inoue¹, Yoshiomi Hiranaga², Takeshi Kobayashi¹, Hiroyuki Yamada¹ (1.AIST, 2.Tohoku Univ.)

Keywords:

Ferroelectricity,Pyroelectric effect,Electrocaloric effect

We measured voltage-dependent hysteresis loops of the pyroelectric and electrocaloric responses in ferroelectric PZT thin films and observed pronounced asymmetric shifts along both the voltage axis and the polarization axis. Analysis of the loop evolution under bipolar triangular pulses and subsequent aging demonstrates that these asymmetries originate from defect-induced domain-wall pinning that suppresses polarization switching. We also confirm a similar effect in single-crystal LiTaO₃ depending on the degree of Li deficiency, and report the impact of domain-wall behavior on the pyroelectric and electrocaloric effects.