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- Title
Ferromagnetism in Electrospun Co-doped SrTiO Nanofibers.
- Authors
Zhang, Wei; Li, He-Ping; Pan, Wei
- Abstract
By employing electrospinning technique, subsequent calcination in air and annealing process in hydrogen, uniform Co-doped SrTiO nanofibers with concentrations of Co between 0 and 0.20 were successfully produced. Their morphologies and detailed structures were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray powder diffraction. And, the chemical states of Co were determined by X-ray photoelectron spectroscopy. It was shown that, after calcination, Co was well incorporated into the perovskite structure of SrTiO, and the nanofibers possessed smooth surface with diameters of 50-100 nm. Magnetic properties of the hydrogen-annealed and -unannealed nanofibers were both measured by physical property measurement system from 50 to 300 K. It was explored that the Co addition and the hydrogen annealing process were both very important to the generation of the observed ferromagnetism in SrTiCoO:H nanofibers. In hydrogen-annealed SrTiCoO:H nanofibers, a saturation magnetization of 0.74 emu/g and an average moment of 0.122 μ/Co were obtained. The origins of the enhanced ferromagnetism in SrTiCoO:H nanofibers were analyzed according to the chemical state of Co and the mediation of oxygen vacancies.
- Subjects
FERROMAGNETISM; STRONTIUM titanate; DILUTED magnetic semiconductors; NANOFIBERS; COBALT; ELECTROSPINNING; SEMICONDUCTOR doping
- Publication
Journal of Materials Science, 2012, Vol 47, Issue 23, p8216
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-012-6717-3