Study of giant magnetization reversal in Bi2FeMnO6, a room temperature magnetodielectric double perovskite
We have recently synthesized Bi2FeMnO6, a novel multiferroic compound belonging to the class of bismuth-based double perovskites, in high temperature/high pressure conditions. Single-crystal diffraction allowed the determination of the crystal structure on the basis of an orthorhombic Pnam cell with lattice parameters a=5.573 Å, b= 11.206 Å and c=15.743 Å. The magnetic characterizations indicate an unconventional magnetic behavior as a function of temperature: due to the concomitant presence of competitive interactions, the material undergoes a complex ferrimagnetic transition around 500 K followed, at lower temperatures, by a field-dependent giant reversal of the magnetization. Furthermore, the study of the electric permittivity reveals the presence of magnetodieletric effects, suggesting the intriguing possibility of magnetoelectricity in Bi2FeMnO6. We consider neutron diffraction the best technique to accurately investigate the nuclear structure of the system –in particular for what concerns the Fe/Mn distribution- and, on the other side, to understand the complex magnetic behavior of the compound as a function of temperature.
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MEZZADRI FRANCESCO; DELMONTE Davide; GILIOLI Edmondo and RITTER Clemens. (2012). Study of giant magnetization reversal in Bi2FeMnO6, a room temperature magnetodielectric double perovskite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2252