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Development of Novel Multiferroic Composites Based on BaTiO3 and Hexagonal Ferrites

Published online by Cambridge University Press:  31 January 2011

D. V. Karpinsky
Affiliation:
karpinski@ua.pt, University of Aveiro, Aveiro, Portugal
E. K. Selezneva
Affiliation:
ekaterina.selez@gmail.com, University of Aveiro, Aveiro, Portugal
Igor Bdikin
Affiliation:
bdikin@ua.pt, UA, Aveiro, Aveiro, 3810-193, Portugal
F. Figueiras
Affiliation:
ffigueiras@ua.pt, University of Aveiro, Aveiro, Portugal
K. E. Kamentsev
Affiliation:
kamentsev@mirea.ru, MIREA, Moscow, Russian Federation
Yuri Fetisov
Affiliation:
fetisov@mirea.ru, MIREA, Moscow, Russian Federation
R. C. Pullar
Affiliation:
r.pullar@imperial.ac.uk, Imperial College, London, United Kingdom
J. Krebbs
Affiliation:
krebbs@imperial.ac.uk, Imperial College, London, United Kingdom
N. M. Alford
Affiliation:
alford@imperial.ac.uk, Imperial College, London, United Kingdom
A. L. Kholkin
Affiliation:
kholkin@gmail.com, University of Aveiro, CICECO, Campus de Santiago, Aveiro, 3810-193, Portugal
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Abstract

A new multiferroic composite ceramics with the general formula (x)Ba(Sr)Fe12O19-(1-x)BaTiO3 (x=0.1, 0.5) was synthesized via a simple solid-state reaction technique. Crystal structure analysis performed for both materials revealed the presence of two crystalline phases pertinent to the initial composite components. X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to testify the crystallinity, microstructure, and local magnetoelectric interactions between ferroelectric and ferromagnetic grains. Magnetic measurements revealed that the saturation magnetization is proportional to the volume fraction of ferrite phase. Dielectric studies demonstrated strong frequency relaxation due to space charge polarization and high conductivity loss making macroscopic magnetoelectric measurements difficult. Novel nanoscale magnetoelectric effect observed by AFM is discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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