APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011;
Dallas, Texas
Abstract: L34.00007 : Emergent phenomena at the heterointerface of multiferroic BiFeO$_{3}$ and ferromagnetic La$_{0.7}$Sr$_{0.3}$MnO$_{3}$
3:42 PM–4:18 PM
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Author:
Novel phenomena and functionalities at the heteroepitaxial
complex oxide heterostructures have been attracting much
scientific attention from the fundamental physics as well as the
technological applications. Essentially, the charge and spin
reconstruction at the interface could lead to exotic,
totally unexpected state of matters at the interface, such as
conductive interface between insulating materials and interfacial
ferromagnetism at the proximity of antiferromagnet. In this talk,
I will present a systematic study of the electronic (charge) and
magnetic (spin) interactions in an
all-oxide model heterostructure system consisting of the
ferromagnet (FM) La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ (LSMO) and the
multiferroic (ferroelectric (FE) and antiferromagnetic (AFM))
BiFeO$_{3}$(BFO). The study has demonstrated the existence of
magnetic coupling at this interface, manifested in the form of an
enhanced coercive field as well as an exchange bias. Using x-ray
magnetic circular dichroism, the origin of the significant
exchange bias has been attributed to a novel ferromagnetic state
in the antiferromagnetic BFO sublattice at the interface with
LSMO. Based on this finding, the electrical control of magnetic
coupling has been explored in the field effect geometry. The
magneto-transport measurement clearly demonstrates a reversible
switch/control between two distinct exchange bias states by
isothermally switching the FE polarization of BFO. This is an
important step towards controlling magnetization with electric
fields, which may enable a new class of electrically controllable
spintronic devices and provide a new basis for producing
electrically controllable spin polarized currents. Finally, at
the end of the talk, a generic interpretation will be proposed
for the understanding of magnetoelectric coupling in the current
model system.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.L34.7