Reliable polarization switching of BiFeO3

Title
Reliable polarization switching of BiFeO3
Authors
백승협Eom, Chang-Beom
Keywords
multi-ferroics; epitaxial thin films; monodomain; fatigue; retention
Issue Date
2012-10
Publisher
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Citation
VOL 370, 4872-4889
Abstract
As a room temperature multi-ferroic with coexisting anti-ferromagnetic, ferroelectric and ferroelastic orders, BiFeO3 has been extensively studied to realize magnetoelectric devices that enable manipulation of magnetic ordering by an electric field. Moreover, BiFeO3 is a promising candidate for ferroelectric memory devices because it has the largest remanent polarization (Pr >100 mCcm−2) of all ferroelectric materials. For these applications, controlling polarization switching by an electric field plays a crucial role. However, BiFeO3 has a complex switching behaviour owing to the rhombohedral symmetry: ferroelastic (71◦, 109◦) and ferroelectric (180◦) switching. Furthermore, the polarization is switched through a multi-step process: 180◦ switching occurs through three sequential 71◦ switching steps. By using monodomain BiFeO3 thin-film heterostructures, we correlated such multi-step switching to the macroscopically observed reliability issues of potential devices such as retention and fatigue. We overcame the retention problem (i.e. elastic back-switching of the 71◦ switched area) using monodomain BiFeO3 islands. Furthermore, we suppressed the fatigue problem of 180◦ switching, i.e. loss of switchable polarization with switching cycles, using a single 71◦ switching path. Our results provide a framework for exploring a route to reliably control multiple-order parameters coupled to ferroelastic order in other rhombohedral and lower-symmetry materials.
URI
http://pubs.kist.re.kr/handle/201004/44221
ISSN
1364503x
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE