title: Multiferroic domain dynamics in strained strontium titanate.
abstract: 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.
authors.affiliation: Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: A
authors.initials: A
authors.lastname: Vasudevarao
authors.forename: A
authors.initials: A
authors.lastname: Kumar
authors.forename: L
authors.initials: L
authors.lastname: Tian
authors.forename: J H
authors.initials: JH
authors.lastname: Haeni
authors.forename: Y L
authors.initials: YL
authors.lastname: Li
authors.forename: C-J
authors.initials: CJ
authors.lastname: Eklund
authors.forename: Q X
authors.initials: QX
authors.lastname: Jia
authors.forename: R
authors.initials: R
authors.lastname: Uecker
authors.forename: P
authors.initials: P
authors.lastname: Reiche
authors.forename: K M
authors.initials: KM
authors.lastname: Rabe
authors.forename: L Q
authors.initials: LQ
authors.lastname: Chen
authors.forename: D G
authors.initials: DG
authors.lastname: Schlom
authors.forename: Venkatraman
authors.initials: V
authors.lastname: Gopalan