Open AccessMagnetic properties of BiMnO3nanoparticles in SBA-15 mesoporous silica
Author(s) -
Takayuki Tajiri,
Manabu Harazono,
Takanori Kitamura,
Hiroyuki Deguchi,
Shigemi Kohiki,
Masaki Mito,
Atsushi Kohno,
Seishi Takagi
Publication year - 2009
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/150/4/042198
Subject(s) - superparamagnetism , antiferromagnetism , materials science , monoclinic crystal system , ferromagnetism , nanoparticle , mesoporous silica , magnetization , condensed matter physics , scherrer equation , mesoporous material , nanotechnology , crystallography , crystal structure , chemistry , magnetic field , physics , organic chemistry , catalysis , quantum mechanics
Nanoparticles of multiferroic material BiMnO3 were synthesized in the pores of the mesoporous silica SBA-15 and their magnetic properties were investigated. The powder X-ray diffraction pattern for the nanoparticles at room temperature was similar to that for bulk crystals with monoclinic symmetry. The particle size of the nanocrystals was estimated to be about 14 nm using Scherrer\u27s equation. The temperature dependence of the DC susceptibilities for the nanoparticles showed superparamagnetic behavior. The susceptibility and thermoremanent magnetization exhibited the ferromagnetic feature and the ferromagnetic transition temperature was almost same to that for bulk crystals, approx 100 K. However, the Weiss temperature Θ was evaluated as the negative value and the magnetization curve showed antiferromagnetic behavior. The results suggest the antiferromagnetic properties appeared prominently in the nanoparticles.Proceedings of the 25th International Conference on Low Temperature Physics (LT 25), August 6-13, 2008, Amsterdam, Netherland