Title :
Giant M-E effect of multiferroic BaTiO3--LaMnO3 ceramic composites
Author :
Ban, Kenichiro ; Gomi, Manabu ; Shundo, Takeshi ; Nishimura, Nobuaki
Author_Institution :
Dept. of Mater. Sci. & Eng., Nagoya Inst. of Technol., Japan
Abstract :
The magnetic and dielectric properties of ceramic composites, in which 10 mol% antiferromagnetic LaMnO3 was added to ferroelectric BaTiO3, have been investigated. X-ray diffraction measurement showed that ceramics sintered in the range of 1050-1150°C are composites containing a small amount of (La, Ba)MnO3 phase along with BaTiO3 phase. These composites were found to be multiferroic materials simultaneously exhibiting ferromagnetic and ferroelectric properties at room temperature. When an electric field of 2.3 kV/mm was applied to the composite sintered at 1200°C, a reduction of spontaneous magnetization as large as 70% was observed at room temperature. This reduction may be ascribed to the decrease of electron transfer interaction of the precipitated ferromagnetic (La, Ba)MnO3 caused by electrostriction of the surrounding BaTiO3 matrix.
Keywords :
barium compounds; composite materials; ferroelectric ceramics; ferromagnetic materials; lanthanum compounds; magnetisation; magnetoelastic effects; sintering; 1050 to 1150 C; 1200 C; LaMnO3; composite materials; dielectric properties; ferroelectric ceramics; ferroelectric properties; ferromagnetic materials; ferromagnetic properties; giant M-E effect; magnetic properties; magnetoelastic effects; multiferroic ceramic composites; multiferroic materials; sintering; spontaneous magnetization reduction; Antiferromagnetic materials; Ceramics; Composite materials; Dielectric measurements; Ferroelectric materials; Magnetic materials; Magnetic properties; Phase measurement; Temperature; X-ray diffraction; Ceramic composite; M-E effect; double-exchange ferromagnet; electrostriction; magneto-electric coupling; multiferroic materials; perovskite;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854773
