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Structural Properties and Magnetic Interactions in Al3+ and Co2+ Co-Incorporated CdO: Efficient Act of Hydrogenation on Ferromagnetic Order

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Abstract

Nano-powder samples of cadmium oxide doped with Al-Co ions were synthesized by the sol–gel technique using a mixture of complexes of cadmium acetate dihydrate, gadolinium acetate hydrate, and aluminum nitrate nonahydrate. The mass ratios of Al/Cd and Co/Cd in the investigated samples (CdO:Al, CdO:CO, and CdO:Al;Co) were 0.5% and 1%, respectively. X-ray diffraction studies confirmed the formation of a single-phase crystalline structure. Thus, both Al and Co ions were successfully incorporated into the CdO lattice. The present work aims to investigate the possible creation of room-temperature (RT) ferromagnetic properties in host CdO for the field of dilute magnetic semiconductorz (DMS). Annealing in H2 atmosphere under certain conditions was extensively utilized to enhance the Heisenberg interactions between the spins of the incorporated dopant ions which boosted the created FM behavior. Optical measurements revealed the redshift of the bandgap by doping and hydrogenation. RT magnetic measurements disclosed various magnetic properties [diamagnetic, paramagnetic (PM), and FM) at RT depending on the dopant type]. However, the hydrogenation converted all the investigated samples to FM. It was established that the hydrogenation could enhance the saturation magnetisation of CdO:Al:Co nano-powder by ∼ 400 times. Therefore, the system of Al/Co-doped CdO nano-powders, owning these amazingly tunable magnetic properties, can be considered as a potential candidate for many applications such as DMS in addition to its transparent conducting oxide properties.

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Dakhel, A.A., Khunji, M.A. & AlBasri, A.R. Structural Properties and Magnetic Interactions in Al3+ and Co2+ Co-Incorporated CdO: Efficient Act of Hydrogenation on Ferromagnetic Order. J. Electron. Mater. 47, 4855–4862 (2018). https://doi.org/10.1007/s11664-018-6376-5

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  • DOI: https://doi.org/10.1007/s11664-018-6376-5

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