Inverse Spin Hall Effect in Electron Beam Evaporated Topological Insulator Bi2Se3 Thin Film
Braj B Singh et al.
physica status solidi (RRL)–Rapid Research Letters 13 (3), 2018, 1800492
Spintronics exploiting pure spin current in ferromagnetic (FM)/heavy metals (HM) is a subject of intense research. Topological insulators having spin momentum locked surface states exhibit high spin–orbit coupling and thus possess a huge potential to replace the HM like Pt, Ta, W, etc. In this context, the spin pumping phenomenon in Bi2Se3/CoFeB bilayers has been investigated. Bi2Se3 thin films are fabricated by electron beam evaporation method on Si (100) substrate. In order to confirm the topological nature of Bi2Se3, low temperature magnetotransport measurement on a 30 nm thick Bi2Se3 film which shows 10% magnetoresistance (MR) at 1.5 K has been performed. A linear increase in MR with applied magnetic field indicates the presence of spin momentum‐locked surface states. A voltage has been measured at room temperature to quantify the spin pumping which is generated via inverse spin Hall effect (ISHE). For the separation of spin rectification effects mainly produced by the FM CoFeB layer, in plane angular dependence of the dc voltage with respect to applied magnetic field has been measured. Our analysis reveals that spin pumping induced ISHE is the dominant contribution in the measured voltage.
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Prof. Dr. Subhankar Bedanta
Professor in Physics
Chief-Coordinator of Centre for Interdisciplinary Sciences (CIS), NISER
Laboratory for Nanomagnetism and Magnetic Materials (LNMM)
National Institute of Science Education and Research
Editorial Assisance
1) Advisory Editorial Board member in Journal of Magnetism and Magnetic Materials (JMMM) of Elsevier.
2) Associate Editor in Journal of Superconductivity and Novel Magnetism of Springer
3) Associate Editor in Frontiers in Physics
4) Associate Editor in Frontiers in Nanotechnology
Lead Editors in Special Issues:
1) Acted as the Lead editor for one special issue in “Journal of Nanomaterials”- Impact factor of ~1.65
Title of the special issue “Synthesis, Properties, and Applications of Single-Domain Magnetic Nanoparticles”
https://doi.org/10.1155/2013/130180
2) I have been the chief editor in special issues in “Physica B: Condensed Matter”
https://doi.org/10.1016/j.jmmm.2020.167282
3) I have been the chief editor in special issues in J. Magnetism and Magnetism Materials
https://doi.org/10.1016/j.jmmm.2020.167282
4) I have been the chief editor in special issues in J. Superconductivity and Novel Magnetism