Magnetization and structural studies of Mn doped ZnO nanoparticles: Prepared by reverse micelle method
| Autor: | Ajayan Vinu, Onattu D. Jayakumar, Ramakant Mahadeo Kadam, Anjana Asthana, Avesh K. Tyagi, I. K. Gopalakrishnan |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Materials science
Rietveld refinement Analytical chemistry Magnetic semiconductor Condensed Matter Physics Ferromagnetic resonance Nanocrystalline material law.invention Inorganic Chemistry Magnetization law Materials Chemistry Selected area diffraction Electron paramagnetic resonance High-resolution transmission electron microscopy |
| Zdroj: | Journal of Crystal Growth. 300:358-363 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/j.jcrysgro.2006.12.030 |
| Popis: | Single phase Mn (2.5 at%) doped ZnO nanocrystalline samples were synthesized by reverse micelle method as characterized by Rietveld refinement analysis of X-ray diffraction data, high resolution transmission electron microscopy and selected area electron diffraction analyses. The X-ray photoelectron spectroscopy and electron paramagnetic resonance (EPR) studies indicated that manganese exist as Mn 2+ in ZnO lattice. DC magnetization measurements as a function of field and temperature, of 2.5 at% Mn doped ZnO nanoparticles annealed at 675 K, showed room temperature ferromagnetism (RTF). This observation is further confirmed by the EPR spectrum of the sample, which shows a distinct ferromagnetic resonance signal at room temperature. These results indicate that the observed RTF in Mn-doped ZnO may be attributed to the substitutional incorporation of Mn at Zn sites. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect