Magnetic Phase Separation in Diluted Magnetic System:Zn1-xFexO
来源期刊：Acta Metallurgica Sinica2017年第6期
论文作者：Archita Mondal Sanchari Sarkar Neepamala Giri Souvik Chatterjee Ruma Ray
文章页码：521 - 527
摘 要：Single-phase diluted magnetic systems Zn1-xFexO have been prepared by chemical route. Structural and spectroscopic（UV–Vis and Mssbauer） studies indicate the incorporation of Fe3+ ions in the lattice sites. The UV–Vis results point to a systematic increase in the band gap with increasing Fe doping. The room temperature magnetization of Zn1-xFexO indicates a paramagnetic behavior which is in accordance with the Mssbauer results, illustrating quadrupolar doublet. At low temperature, the zero-field-cooled（ZFC） magnetization shows a cusp and this temperature increases systematically with decreasing particle size. The weak exchange bias effect manifested by a M–H loop shift is observed for x = 0.03. This shift is accompanied by the enhancement of coercivity. The dc magnetization results suggest the coexistence of ferromagnetic and antiferromagnetic exchange interactions for low doping of Fe, i.e., for x = 0.03.
Archita Mondal1，Sanchari Sarkar1，Neepamala Giri1，Souvik Chatterjee2，Ruma Ray1
1. Department of Physics, Jadavpur University2. UGC-DAE Consortium for Scientific Research,Kolkata Centre
摘 要：Single-phase diluted magnetic systems Zn1-xFexO have been prepared by chemical route. Structural and spectroscopic（UV–Vis and Mssbauer） studies indicate the incorporation of Fe3+ ions in the lattice sites. The UV–Vis results point to a systematic increase in the band gap with increasing Fe doping. The room temperature magnetization of Zn1-xFexO indicates a paramagnetic behavior which is in accordance with the Mssbauer results, illustrating quadrupolar doublet. At low temperature, the zero-field-cooled（ZFC） magnetization shows a cusp and this temperature increases systematically with decreasing particle size. The weak exchange bias effect manifested by a M–H loop shift is observed for x = 0.03. This shift is accompanied by the enhancement of coercivity. The dc magnetization results suggest the coexistence of ferromagnetic and antiferromagnetic exchange interactions for low doping of Fe, i.e., for x = 0.03.
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