Title: Magnetic states in Fe-doped Bi₂Se₃ topological insulators nano-crystallites

Authors: Somaya M. Al-Hindawey; Amany M. El Nahrawy; Ahmed I. Ali; Hamdia A. Zayed

Addresses: Physics Department, Faculty of Science, Art and Education for Women, Ain Shams University, 11722 Cairo, Egypt ' Solid-State Physics Department, Physics Research Division, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt ' Basic Science Department, Faculty of Education and Technology, Helwan University, Sary El-Qopa, P.O. 11281, Cairo, Egypt ' Physics Department, Faculty of Science, Art and Education for Women, Ain Shams University, 11722 Cairo, Egypt

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.

Keywords: composite; Bi₂Se₃; Fe-doping Bi₂Se₃; sol-gel method; magnetic properties; topological insulators.

DOI: 10.1504/IJMATEI.2021.120420

International Journal of Materials Engineering Innovation, 2021 Vol.12 No.4, pp.325 - 336

Received: 03 Jan 2021
Accepted: 27 Jan 2021
Published online: 19 Jan 2022 *

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