[17a-B3-1~8] 6.1 Ferroelectric thin films

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[17a-B3-2] Fabrication of freestanding PbTiO₃/SrTiO₃ artificial superlattice films with vortex polarization

〇Kohei Takahashi¹, Shinya Kondo², Syunya Murai³, Rai Kou³, Masahito Yoshino¹, Takanori Nagasaki¹, Tomoaki Yamada^1,4 (1.Nagoya Univ., 2.Okayama Univ., 3.AIST, 4.Tokyo Tech. MDX)

Keywords:

artificial superlattice

In 2016, it was reported that in PbTiO₃(PTO)_n/SrTiO₃(STO)_n artificial superlattices, a vortex polarization structure forms in the PTO layer when the number of unit cells in each layer is controlled within a specific range. This vortex polarization is caused by an exquisite balance between the elastic energy due to lattice distortion of the PTO, the electrostatic energy at the interface, and the gradient energy to rotate the polarization. We hypothesized that the vortex polarization property may change when the artificial superlattice is detached from the substrate and made into a freestanding film, altering the above energy balance.