Optical nonlinearity in multiferroic bismuth ferrite
作者： P. Nisha Francis , S. Dhanuskodi , M. Muneeswaran , Anitta Rose Thomas , N.V. Giridharan
DOI: 10.1016/J.JALLCOM.2016.07.094
关键词: Z-scan technique 、 Magnetization 、 Ferromagnetism 、 Dielectric 、 Analytical chemistry 、 Nuclear magnetic resonance 、 Multiferroics 、 Orthorhombic crystal system 、 Bismuth ferrite 、 Materials science 、 Ferroelectricity
摘要: Abstract Bismuth ferrite (BFO) nanoparticles were synthesized via sol-gel route with malic acid as a chelating agent. Structural characterization by XRD reveals the formation of single phase rhombohedral BFO and FTIR (433, 546 cm−1) confirms molecular structure. FESEM exhibits an agglomerated spherical morphology average particle size 119 nm. The first second order structural transitions have been detected at 821 (rhombohedral – orthorhombic) 932 °C (orthorhombic cubic) DTA. Strong visible light absorption band gap 1.92 eV defect related emissions blue (417,450 nm) green (521 nm) regions observed. Multiferroic properties room temperature show weak ferromagnetism remnant magnetization (Mr) 0.179 emu/gm ferroelectric behavior polarization (Pr) 0.08 μC/cm2. Dielectric measurements function frequency (100 Hz–5 MHz) (30–450 °C) illustrate evidence for magnetoelectric coupling peak 350 °C indicating magnetic transition. Third nonlinear optical property studied open aperture Z-scan technique (Nd: YAG, 532 nm, 5 ns) shows reverse saturable (RSA) based limiting behavior.
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