Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Multiferroics II: Strain and Composites (jointly with DF, DS, KR, TT)
MA 15.6: Talk
Monday, March 14, 2011, 18:15–18:30, HSZ 04
Magnetoelectric properties of core-shell CoFe2O4-BaTiO3 composites — •Vladimir Shvartsman1, Firas Alawneh2, Morad Etier1, Shiwam Tiwari1, and Doru Lupascu1 — 1Institut für Materilawissenschaft, Universität Duisburg-Essen — 2The Hashemite University, Zarqa, Jordan
In recent years there has been growing interest in materials exhibiting the magnetoelectric (ME) effect. A large ME coupling has been achieved in composites, where a magnetostrictive phase is mechanically coupled to a piezoelectric phase. The magnitude of the ME effect in such systems depends on the properties of the phases and the type of connectivity. In particular, in core/shell-type structures, where the magnetostrictive core is surrounded by the piezoelectric shell, a large well-defined interface area should enhance the ME coupling.
We report on results of synthesis and ME characterization of CoFe2O4 - BaTiO3 composites with the core-shell structure. The ceramic samples were prepared by covering cobalt ferrite nanoparticles by a shell of BaTiO3 using a sol-gel technique. Scanning probe microscopy studies confirm formation of the core-shell structure with a magnetic core and piezoelectric shell. The ME effect was measured using a modified SQUID susceptometer. Though the relatively high conductivity of the samples prevents an efficient poling of the ferroelectric component, the obtained ME coefficients are comparable to those reported for similar systems. Effects of the microstructure and ratio between piezoelectric and magnetostrictive phases on ME performance are analysed.