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Electric-field control of local ferromagnetism using a magnetoelectric multiferroic.

TitleElectric-field control of local ferromagnetism using a magnetoelectric multiferroic.
Publication TypeJournal Article
Year of Publication2008
AuthorsChu Y-H, Martin LW, Holcomb MB, Gajek M, Han S-J, He Q, Balke N, Yang C-H, Lee D, Hu W, Zhan Q, Yang P-L, Fraile-Rodríguez A, Scholl A, Wang SX, Ramesh R
JournalNat Mater
Volume7
Issue6
Pagination478-82
Date Published2008 Jun
ISSN1476-1122
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.

DOI10.1038/nmat2184
Alternate JournalNat Mater
PubMed ID18438412