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Effect of Diamagnetic A2+ Substitution on the Magnetic and Ferroelectric Properties of the Bi1−xAxFeO3 Multiferroics

Published online by Cambridge University Press:  01 February 2011

V. A. Khomchenko ,
D. A. Kiselev ,
J. M. Vieira ,
Li Jian ,
A. M. L. Lopes ,
Y. G. Pogorelov ,
J. P. Araujo  and
A. L. Kholkin
V. A. Khomchenko
Affiliation:
khomchenko@cv.ua.pt, University of Aveiro, Department of Ceramics and Glass Engineering & CICECO, -, Aveiro, 3810-193, Portugal, +351 234 370 354, +351 234 425 300
D. A. Kiselev
Affiliation:
dmitry@ua.pt, University of Aveiro, Department of Ceramics and Glass Engineering & CICECO, Aveiro, 3810-193, Portugal
J. M. Vieira
Affiliation:
jvieira@ua.pt, University of Aveiro, Department of Ceramics and Glass Engineering & CICECO, Aveiro, 3810-193, Portugal
Li Jian
Affiliation:
lijian@ua.pt, University of Aveiro, Department of Ceramics and Glass Engineering & CICECO, Aveiro, 3810-193, Portugal
A. M. L. Lopes
Affiliation:
allopes@fis.ua.pt, University of Porto, IFIMUP/ Department of Physics, Rua Campo Alegre 687, Porto, 4169-007, Portugal
Y. G. Pogorelov
Affiliation:
ypogorel@fc.up.pt, University of Porto, IFIMUP/ Department of Physics, Rua Campo Alegre 687, Porto, 4169-007, Portugal
J. P. Araujo
Affiliation:
jearaujo@fc.up.pt, University of Porto, IFIMUP/ Department of Physics, Rua Campo Alegre 687, Porto, 4169-007, Portugal
A. L. Kholkin
Affiliation:
kholkin@ua.pt, University of Aveiro, Department of Ceramics and Glass Engineering & CICECO, Aveiro, 3810-193, Portugal
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Abstract

Investigation of crystal structure, magnetic and local ferroelectric properties of the diamagnetically-doped Bi1−xAxFeO3 (A= Ca, Sr, Pb, Ba; x= 0.2, 0.3) ceramic samples has been carried out. It has been shown that the solid solutions have a rhombohedrally distorted perovskite structure described by the space group R3c. Piezoresponse force microscopy data have revealed the existence of the spontaneous ferroelectric polarization in the samples at room temperature. Magnetization measurements have shown that the magnetic state of these compounds is determined by the ionic radius of the substituting elements. A-site substitution with the biggest ionic radius ions has been found to suppress the spiral spin structure of BiFeO3 and to result in the appearance of weak ferromagnetism. The magnetic properties have been discussed in terms of doping- induced changes in the magnetic anisotropy.

Keywords

ferroelectricitymagnetic propertiesscanning probe microscopy (SPM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1034 , 2007 , 1034-K10-76
Copyright
Copyright © Materials Research Society 2008

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