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
Group Activities
FIMTA2022 conference @ IMMT Bhubaneswar
Pushpendra receiving best poster award @FIMTA 2022
Akilan and Susree after receiving their MSc degree, Purbasha received her doctorate degree and Swayang received her MSc component of Int. PhD degree on XIth graduation ceremony, NISER, Bhubaneswar
Farewell to Dr. Sagarika Nayak, 2022
Dr. Purbasha Sharangi (2022) after her Ph.D. defence with thesis monitoring committee
My fourth PhD student Sagarika after receiving her degree
Dr. Purbasha Sharangi (2022) after her Ph.D. defence, my fifth Ph.D. student
Shashank, Ashish (MSc Students) and Sagarika (PhD) after receiving their degree (2021)
Ganesh Puja in our Lab
Group picnic at Botanical Garden
Farewell to Dr. Srijani Mallik
My M.Sc. students after receiving their graduation degree (Mr. Gajanan; left and Mr. Bishwajit; right), 2019
At botanical garden during new year picnic 2021
Dr. Srijani Mallick (2019) after her Ph.D. defence, my third Ph.D. student
Dr. Sougata Mallick (2019) after his Ph.D. defence, my second Ph.D. student
ICMAGMA-2018 held at NISER as myself as the convener
My Ph.D. student Ms. Purbasha and Dr. Braj Bhusan (Inspire Faculty) at Neutron beamline @ maria MLZ Germany (2018)
At Puri beach during ICMAGMA 2018
In Konark with Prof. W. Kleemann and Prof. Peter Fischer (2018)
In Konark
In Konark with Prof. K. Takanashi and Prof. T. Seki
In Konark with Prof. T. Brueckel
After spending a beautiful evening with my collaborators and family during ICMAGMA 2018
My first Ph.D. student (Niru, at centre) and M.Sc. students (Swapna, left) and Bikash (right) in 2017
Dr. Niru Chaudhury (2016) after her Ph.D. defence, my first Ph.D. student
Farewell to Dr. Niru Chaudhury
IJWMN -2016, conference dinner
Group picnic at Chilika lake- January 2016
After spending a beautiful evening with LNMM family on 28.07.2016
Indo-Japan workshop held at NISER as myself as the convener in January 2015
Youngest members of family- Sansubh and Sagun
