Multiferroic domain dynamics in strained strontium titanate.
Multiferroicity can be induced in strontium titanate by applying biaxial strain. Using optical second harmonic generation, we report a transition from 4/mmm to the ferroelectric mm2 phase, followed by a transition to a ferroelastic-ferroelectric mm2 phase in a strontium titanate thin film. Piezoelectric force microscopy is used to study ferroelectric domain switching. Second harmonic generation, combined with phase-field modeling, is used to reveal the mechanism of coupled ferroelectric-ferroelastic domain wall motion. These studies have relevance to multiferroics with coupled polar and axial phenomena.
Vasudevarao
A
A
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Kumar
A
A
Tian
L
L
Haeni
J H
JH
Li
Y L
YL
Eklund
C-J
CJ
Jia
Q X
QX
Uecker
R
R
Reiche
P
P
Rabe
K M
KM
Chen
L Q
LQ
Schlom
D G
DG
Gopalan
Venkatraman
V