Antiferromagnetic interactions in Er-doped SnO2 DMS nanoparticles |
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| Authors: | S. Sambasivam D. Paul Joseph Jung Hyun Jeong Byung Chun Choi Kwon Taek Lim Sang Su Kim Tae Kwon Song |
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| Affiliation: | (1) Department of Physics, Pukyong National University, Busan, 608-737, South Korea;(2) Center for Condensed Matter Sciences, National Taiwan University, Taipei, 10617, Taiwan;(3) Image System Science & Engineering, Pukyong National University, Busan, 608-737, Korea;(4) Department of Physics, Changwon National University, Changwon, 641-773, Korea;(5) Department of Ceramic Science and Engineering, Changwon National University, Changwon, 641-773, Korea; |
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| Abstract: | Diluted magnetic semiconductor (DMS) nanoparticles of Sn1−x Er x O2 (x = 0.0, 0.02, 0.04, and 0.1) were prepared by sol–gel method. The X-ray diffraction patterns showed SnO2 rutile structure for all samples with no impurity peaks. The decrease in crystallite size with Er concentration was confirmed from TEM measurements (from 12 to 4 nm). The UV–Visible absorption spectra of Er-doped SnO2 nanoparticles showed blue shift in band gap compared to undoped SnO2. The electron spin resonance analysis of Er-doped SnO2 nanoparticles indicate Er3+ in a rutile lattice and also decrease in intensity with Er concentration above x = 0.02. Temperature-dependent magnetization studies and the inverse susceptibility curves indicated increased antiferromagnetic interaction with Er concentration. |
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