title: Electric field-induced magnetization switching in epitaxial columnar nanostructures.
abstract: We present direct evidence for room-temperature magnetization reversal induced by an electric field in epitaxial ferroelectric BiFeO3-ferrimagnetic CoFe2O4 columnar nanostructures. Piezoelectric force microscopy and magnetic force microscopy were used to locally image the coupled piezoelectric-magnetic switching. Quantitative analyses give a perpendicular magnetoelectric susceptibility of approximately 1.0 x 10(-2) G cm/V. The observed effect is due to the strong elastic coupling between the two ferric constituents as the result of the three-dimensional heteroepitaxy.
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA. zavaliche@berkeley.edu
authors.forename: F
authors.initials: F
authors.lastname: Zavaliche
authors.forename: H
authors.initials: H
authors.lastname: Zheng
authors.forename: L
authors.initials: L
authors.lastname: Mohaddes-Ardabili
authors.forename: S Y
authors.initials: SY
authors.lastname: Yang
authors.forename: Q
authors.initials: Q
authors.lastname: Zhan
authors.forename: P
authors.initials: P
authors.lastname: Shafer
authors.forename: E
authors.initials: E
authors.lastname: Reilly
authors.forename: R
authors.initials: R
authors.lastname: Chopdekar
authors.forename: Y
authors.initials: Y
authors.lastname: Jia
authors.forename: P
authors.initials: P
authors.lastname: Wright
authors.forename: D G
authors.initials: DG
authors.lastname: Schlom
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: R
authors.initials: R
authors.lastname: Ramesh