title: Electric-field control of local ferromagnetism using a magnetoelectric multiferroic.
abstract: Multiferroics are of interest for memory and logic device applications, as the coupling between ferroelectric and magnetic properties enables the dynamic interaction between these order parameters. Here, we report an approach to control and switch local ferromagnetism with an electric field using multiferroics. We use two types of electromagnetic coupling phenomenon that are manifested in heterostructures consisting of a ferromagnet in intimate contact with the multiferroic BiFeO(3). The first is an internal, magnetoelectric coupling between antiferromagnetism and ferroelectricity in the BiFeO(3) film that leads to electric-field control of the antiferromagnetic order. The second is based on exchange interactions at the interface between a ferromagnet (Co(0.9)Fe(0.1)) and the antiferromagnet. We have discovered a one-to-one mapping of the ferroelectric and ferromagnetic domains, mediated by the colinear coupling between the magnetization in the ferromagnet and the projection of the antiferromagnetic order in the multiferroic. Our preliminary experiments reveal the possibility to locally control ferromagnetism with an electric field.
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, USA.
authors.forename: Ying-Hao
authors.initials: YH
authors.lastname: Chu
authors.forename: Lane W
authors.initials: LW
authors.lastname: Martin
authors.forename: Mikel B
authors.initials: MB
authors.lastname: Holcomb
authors.forename: Martin
authors.initials: M
authors.lastname: Gajek
authors.forename: Shu-Jen
authors.initials: SJ
authors.lastname: Han
authors.forename: Qing
authors.initials: Q
authors.lastname: He
authors.forename: Nina
authors.initials: N
authors.lastname: Balke
authors.forename: Chan-Ho
authors.initials: CH
authors.lastname: Yang
authors.forename: Donkoun
authors.initials: D
authors.lastname: Lee
authors.forename: Wei
authors.initials: W
authors.lastname: Hu
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhan
authors.forename: Pei-Ling
authors.initials: PL
authors.lastname: Yang
authors.forename: Arantxa
authors.initials: A
authors.lastname: Fraile-Rodríguez
authors.forename: Andreas
authors.initials: A
authors.lastname: Scholl
authors.forename: Shan X
authors.initials: SX
authors.lastname: Wang
authors.forename: R
authors.initials: R
authors.lastname: Ramesh