[Zurück]

V. Giap, R. Grössinger:
"Effect of preparation conditions on magnetoelectric properties of CoFe₂O₄-BaTiO₃ magnetoelectric composites";
Journal of Magnetism and Magnetic Materials, 316 (2007), S. e624 - e627.

Effect of preparation conditions on magnetoelectric properties of CoFe₂O₄-BaTiO₃ magnetoelectric composites

Giap V. Duong a, b and R. Groessinger a,

a Institute for Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
b Faculty of Chemical Engineering, Hanoi University of Technology, Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam

Abstract

The preparation conditions affect the microstructure of the samples and influence the coupling between the magnetostrictive and piezoelectric phases in magnetoelectric composites. In this work, the optimum conditions for preparing CoFe₂O₄-BaTiO₃ core-shell structure magnetoelectric composites were investigated. For pressing the composite powders, an optimum pressure of 6 tons/cm² was found. For the sintering process, to sinter the sample at 1250°C for 4 h was best suited. By changing the preparation conditions, the magnetoelectric effect (ME) coefficients of the studied samples may change 20 times, from 0.18 to 3.53 and 0.1 to 2.23 mV/cm Oe for longitudinal and transverse measurements, respectively. This shows the preparation conditions, which mean that the microstructure plays an important role for the magnetoelectric effect in CoFe₂O₄-BaTiO₃ magnetoelectric composites.

Magnetoelectric effect; Multiferroic composite; Preparation condition; Barium titanate; Cobalt ferrite

http://dx.doi.org/10.1016/j.jmmm.2007.03.142

http://dx.doi.org/10.1016/j.jmmm.2007.03.142