Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 86: Ferroics and Multiferroics (joint session KFM/TT/MA)
TT 86.1: Vortrag
Donnerstag, 15. März 2018, 09:30–09:50, EMH 225
A piezoresponse force microscopy study of Bi(Fe,Sc)O3 multiferroic ceramics — •Vladimir Shvartsman1, Andrei Salak2, Dmitry Khalyavin3, and Doru Lupascu1 — 1Institute for Material Science, University of Duisburg-Essen, Essen, Germany — 2Department of Materials and Ceramic Engineering/CICECO, University of Aveiro, Aveiro, Portugal — 3ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, UK
Bismuth ferrite (BFO) has attracted an immense attention as a rare room-temperature single-phase multiferroics. The magnetic and ferroelectric structure of BFO can be tuned by cationic substitutions. In particular, using the high-pressure synthesis method BiFe(1-x)Sc(x)O3 ceramics can be sintered. The material appears in different polymorphs. The phase obtained by quenching under pressure is antipolar, but can be irreversibly turned into a polar one by thermal cycling at normal pressure. The resulting modification is a rare example of coexistence of canted ferroelectric and ferromagnetic states. We have addressed ferroelectric properties of these materials by piezoresponse force microscopy (PFM). The post-annealed Bi(Fe0.5Sc0.5)O3 ceramics show a strong PFM signal and posses a well-developed domain pattern typical of a ferroelectric state. The quenched ceramics, however, demonstrate no piezoresponse that is in line with its antiferroelectric state. We found that this state can be transferred to a ferroelectric one by application of a strong enough electric field. The temporal and temperature stability of the induced states are studied.