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URVASHI VERMA
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Volume 45 All articles Published: 8 February 2022 Article ID 0032
Cobalt (Co)-doped zinc oxide (ZnO) diluted magnetic semiconductor thin films were grown using a low-cost spray pyrolysis technique. X-ray diffraction (XRD) studies show that the films crystallize in the pure wurtzite structure.No evidence of the formation of secondary phases like Co clusters, CoO or Co$_3$O$_4$ were detected from XRD studies. Scanning electron microscopy studies show uniform growth over the substrates and energy dispersive analysis of X-ray studies confirm the presence of Co in ZnO. The absorption bands peaked at the wavelength ${\sim}$658, 613 and 567 nm in the optical transmission spectra show that the Co enters the tetrahedral sites of the wurtzite structure in the desired Co$^{2+}$ oxidation state. The strong optical absorption in the band tail region indicates the existence of magnetic ion-induced charge-transfer states (CTSs) just below the band edge. The photoluminescence from ZnO is found to be completelyquenched on Co doping due to the occurrence of CTSs. Magnetic studies show that all the films possess ferromagnetism at room temperature with Curie temperature well above the room temperature. The grown films have potential applications in spintronic devices.
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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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