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.
Homepage of
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
1. Dr. Subhankar Bedanta is the chief coordinator of Centre for Interdisciplinary Sciences(CIS). He has initiated the idea of CIS at NISER. He has mainly coordinated the proposal for DAE and defended the project to the program advisory committe of DAE and then to secretary, DAE. Funding of ~ Rs. 50Cr have been sanctioned for setting up the CIS in NISER. Dr. Bedanta has coordinated the infrastructure development and many state-of-art equipment have been installed.
For details please refer to the website of CIS:
https://www.niser.ac.in/CIS/
2. Dr. Bedanta has been the faculty-in-charge of the auditorium and Guest house for a period of 3.5 years. During this period many infrastructural developments have been made in the A-type guest house in NISER. Further he has been instrumental in the infrastructure development and furnishing of the Pathani Samanta Auditorium Complex.
