Theoretical Consideration on the 90° Domain Walls in Tetragonal Ferroelectrics

Abstract

A theory of 90° domain walls in tetragonal ferroelectrics is proposed. It is argued that the depolarizing field discerns the stable head-to-tail wall from the unstable head-to-head wall energetically. The relation between the free energy function and the effect of the depolarizing field is discussed.

Keywords:

• Ferroelectrics
• 90° domain wall
• depolarization field

Acknowledgement

The present work is partially supported by the Grant-in-Aid from the Ministry of Education and Sciences of Japan (No. 12134208 and No. 14540312).