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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