Abstract
We investigated the magnetic interaction of carbon (C)-transition (Cr/Fe) and rare-earth Gadolinium (Gd) metal co-doped bismuth telluride (BT) systems (CrxCyBi12−xTe18−y, FexCyBi12−xTe18−y and GdxCyBi12−xTe18−y (x = 1, y = 1) supercell structures) by using the density functional theory based on the full-potential linear augmented plane wave method via inclusion of spin polarized calculation. Addition of metal dopant ions in bismuth telluride enhanced the total spin magnetic moment of the entire system (Mtot), which was further increased by the presence of the carbon ion. However, spin magnetic moment of individual dopant ions (MS) was found to be increased or decreased depending upon the position of the metal-carbon dopants relative to each other. This increase in MS is explained by Zener exchange mechanism. C showed a weak MS, in its addition in the BT system. Gd-C co-doping showed highest Mtot and MS compared to Fe-C doped (BT) system. The spin magnetic moment of the system and that of individual dopant ions is influenced by varying the position of C relative to metal dopant ions in BT system. This understanding over the changes in the value of magnetic moment with respect to the position of C ion compared to other dopant ions in the material will lead to the future improvement of magnetic data storage devices.
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We would like to thank the Solar Energy Laboratory, Department of Applied Physics, Indian Institute of Technology (ISM), Dhanbad, Jharkhand, India, for providing computational facilities.
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Kaleemullah, N.S., Malaidurai, M., Thangavel, R. et al. Effect of carbon co-doping on magnetic properties of transition and rare-earth metal-doped bismuth telluride. Bull Mater Sci 45, 234 (2022). https://doi.org/10.1007/s12034-022-02808-z
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DOI: https://doi.org/10.1007/s12034-022-02808-z