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Magnetic and Structural Properties of Co doped ZnO Nanoparticles
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ashraf, Robina Riaz, Saira Bashir, Mahwish Naseem, Shahzad |
| Copyright Year | 2013 |
| Abstract | Semiconductor materials with dilute doping of transition metals are of great interest in spintronic applications. In order to investigate the magnetic properties of these diluted magnetic semiconductors, Co-doped Zinc Oxide nanoparticles and thin films are prepared by simple, economic and application oriented sol-gel method. Zinc acetate dihydrate and Cobalt nitrate are used as precursor materials. It is worth mentioning here that all the synthesis is carried out at room temperature. Thin films have been deposited by spin coating technique on glass substrates. Cobalt composition is varied in a range from 0-9wt%. The deposited thin films with the thickness of 80nm are then magnetically annealed at 300°C for 1 hour. XRD results show that Cobalt is successfully doped in zinc oxide crystal lattices while preserving the ZnO wurtzite structure. With increasing cobalt concentration peak broadening is observed in (101) peak which is high intensity peak. Surface morphology is studied by SEM and it indicates that the particle size less than 20 nm in case of nanoparticles and wrinkle network like structure with uniform distribution of size is clearly seen in case of thin films. With increasing cobalt concentration size of the nanostructure decreases well. The effect of cobalt doping on magnetic properties of the synthesized nanoparticles and thin films has been investigated by using VSM. Room temperature ferromagnetism is observed in almost all the samples. It is observed that the doping of cobalt plays important role in the presence of ferromagnetism as the difference in the radii of high spin cobalt (0.58 Å) and divalent Zinc (0.60 Å) is small. It is also observed that strong magnetic properties and crystal quality is obtained by doping with 1% to 10% Cobalt in ZnO to obtain diluted magnetic semiconductors while lower doping percentage results in the lower magnetization and higher doping percentage results in the presence of the secondary phase. Interaction of the transition metal (Cobalt in this case) and free carriers results in the ferromagnetism. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.i-asem.org/publication_conf/anbre13/M5A.7.MS541_1022F.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
