Magnetic states in Fe-doped Bi₂Se₃ topological insulators nano-crystallites
by Somaya M. Al-Hindawey; Amany M. El Nahrawy; Ahmed I. Ali; Hamdia A. Zayed
International Journal of Materials Engineering Innovation (IJMATEI), Vol. 12, No. 4, 2021

Abstract: The effect of Fe-doping on FexBi₂-xSe₃ (x = 0, 0.4, 1.0 and 1.4) nano-crystallites was experimentally investigated. X-ray diffraction (XRD) results showed that the structure of these samples had changed from amorphous structure for pure Bi₂Se₃ to polycrystalline structure with doping Fe₂O₃. Both SEM and TEM confirmed a combination of nanorods and nanospheres in soft accumulation of the samples with an average particle nano-size nearly 30 nm-33 nm. Thermal analysis for all samples have been recorded and exhibited a weight loss at 500°C corresponds to the crystallisation of pure Bi₂Se₃. In addition, magnetic moment-field dependence confirmed an antiferromagnetic state in the composite. The magnetic moment and the saturation values were increased with increasing the Fe₂O₃ levels of doping. Experimental data confirmed that adding Fe-ions can creates a magnetic state in an insulator Bi₂Se₃ for applications of the next-generation of electronic devices including; spintronics, topological quantum computation and dissipation less topological electronics.

Online publication date: Wed, 19-Jan-2022

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