Electric-field control of local ferromagnetism using a magnetoelectric multiferroic.
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.
Chu
Ying-Hao
YH
Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, USA.
Martin
Lane W
LW
Holcomb
Mikel B
MB
Gajek
Martin
M
Han
Shu-Jen
SJ
He
Qing
Q
Balke
Nina
N
Yang
Chan-Ho
CH
Lee
Donkoun
D
Hu
Wei
W
Zhan
Qian
Q
Yang
Pei-Ling
PL
Fraile-Rodríguez
Arantxa
A
Scholl
Andreas
A
Wang
Shan X
SX
Ramesh
R
R