• Physicochemical, structural and induced ferromagnetic properties of Co–In-codoped CdO synthesised via Cd chloride: significant effect of post-treatment hydrogen

• # Fulltext

https://www.ias.ac.in/article/fulltext/boms/039/07/1843-1850

• # Keywords

Co–In-codoped CdO; room-temperature ferromagnetism; hydrogen treatment.

• # Abstract

Nanoparticle solid solution powders of cadmium oxide doped with different concentrations of cobalt and indium ions were synthesised by solvothermal method through CdCl$_2$·H$_2$O precursor route. The objective of the present work is to study and develop conditions necessary to create stable room-temperature ferromagnets (RTFMs) in transparent conducting oxide (TCO) CdO for applications in the field of dilute magnetic semiconductors (DMSs). To achieve this aim, cobalt (Co$^{2+}$) dopant ions were used as a source of stable FM, while In$^{3+}$ dopant ions supply free electrons that enhance the electronic medium of interaction. The electronic medium in the host CdO lattice,which carries the long-range spin–spin ($S.S$) exchange interaction between localised Co$^{2+}$ (3d) spins of dopant ions, was further developed by annealing in hydrogen gas (hydrogenation). The crystalline structure of the powder samples was investigated by the X-ray diffraction (XRD) method. The optical absorption properties were studied by diffuse reflection spectroscopy (DRS). Magnetic measurements reveal that the Co–In-codoped CdO powder has FM properties superimposed on paramagnetic (PM) behaviour. However, annealing in hydrogen atmosphere strongly boosts the created FMso that the saturation magnetisation increases $\sim$90 times. Physical explanations and discussion are given in the article. Thus, it is proved that the magnetic properties could be tailored to TCO CdO by Co-doping and post-treatment under H$_2$ atmosphere.

• # Author Affiliations

1. Department of Physics, College of Science, University of Bahrain, P.O. Box 32038, Bahrain, Kingdom of Bahrain

• # Bulletin of Materials Science

Volume 44, 2021
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020