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dc.contributor.author백승협-
dc.contributor.authorEom, Chang-Beom-
dc.date.accessioned2015-12-03T00:54:55Z-
dc.date.available2015-12-03T00:54:55Z-
dc.date.issued201210-
dc.identifier.citationVOL 370, 4872-4889-
dc.identifier.issn1364503x-
dc.identifier.other38903-
dc.identifier.urihttp://pubs.kist.re.kr/handle/201004/44221-
dc.description.abstractAs 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.-
dc.publisherPHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES-
dc.subjectmulti-ferroics-
dc.subjectepitaxial thin films-
dc.subjectmonodomain-
dc.subjectfatigue-
dc.subjectretention-
dc.titleReliable polarization switching of BiFeO3-
dc.typeArticle-
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