Title :
Enhancement of ferromagnetic interactions in multiferric (Tb1-xNax)MnO3 system
Author :
Chan, T.S. ; Liu, R.S. ; Lien, Y.H. ; Yang, C.C. ; Huang, C.Y. ; Lin, J.G.
Author_Institution :
Center for Nano Storage Res., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
The crystal structure, magnetic, and transport properties of (Tb1-xNax)MnO3 (0≤x≤0.3) perovskites prepared by solid-state reaction were investigated. According to powder X-ray diffraction (XRD), the compounds were found to be of orthorhombic crystal structure with a space group Pbnm. The (Tb1-xNax)MnO3 system shows a magnetic transition around 10, 20, and 30 K for x=0,0.15,and0.3, respectively, at a magnetic field of 1000 Oe. Both magnitude and the temperature position of the peak increase with increasing Na content. This behavior points to enhancement of the ferromagnetic interactions. Moreover, a decrease in activation energy from 62 meV (x=0) to 39 meV (x=0.3) was found. This means that Na substitution decreases the activation energy and resistivity in the parent TbMnO3.
Keywords :
ferroelectric materials; ferromagnetism; magnetic transitions; magnetoelectric effects; manganese compounds; sodium compounds; terbium compounds; (Tb1-xNax)MnO3 perovskites; MnO; TbNa; ferroelectric materials; ferromagnetic interactions; ferromagnetism; magnetic transitions; magnetoelectric effects; multiferric (Tb1-xNax)MnO3 system; orthorhombic crystal structure; powder X-ray diffraction; solid-state reaction; Magnetic materials; Magnetic properties; Magnetization; Magnetoelectric effects; Oxidation; Polarization; Powders; Solid state circuits; X-ray diffraction; X-ray scattering; Ferroelectric materials; X-ray; magnetic susceptibility; magnetoelectric effects;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854826
