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
6) Organizing as convener of the Webinar series on spintronics (W2S-Spintronics) -2020. Via this event every week a webinar is given by an expert working in the field of spintronics. About 200 participants have registered for this series of webinars.
For details please visit: https://www.niser.ac.in/w2s-seminar/
5) Organized as convener of the Indo-Japan workshop on interface phenomenon for spintronics (IJW-IPS 2022). The event was conducted in fully online mode. About 300 participants have registered for the workshop.
4) Organized as convener of the Symposium on Magnetism and Spintronics (SMS-2021). The event was conducted in fully online mode. About 450 participants have registered for the conference. The symposium promoted a stronger interaction between the national and international scientific communities pursuing research and development in the area of magnetism and/or spintronics.
3)Organized as Convener of the International Conference on Magnetic Materials and Applications (ICMAGMA 2018) at NISER Bhubaneswar. About 500 participants attended this event from nearly 22 countries.
2) Organized as Convener an Indo-Japan workshop on Magnetism at Nanoscale (IJWMN-2015) at NISER in January 2015. About 120 participants attended this event.
1) Co-convener an Indo-Japan workshop on Magnetism at Nanoscale (IJWMN-2015) at IMR, Sendai, Japan in January 2016. About 50 participants attended this event.