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
Resume of
Prof. Subhankar Bedanta
Personal Information:
Prof. Dr. Subhankar Bedanta
Professor
School of Physics
National Institute of Science Education and Research (NISER)
Po-Bhimpur-Padanpur
Via-Jatni; Dist-Khurda
Odisha 752050, India
Email: sbedanta@niser.ac.in
sbedanta@gmail.com
Phone: +91-(0) 674- 2494232 (office)
+91-(0) 674- 2494232 (lab)
Fax: +91- (0) 674- 2494004
homepage:- http://www.niser.ac.in/~sbedanta
-
Date of Birth: 21.02.1980
-
Marital Status: Married, one son and one daughter
Background:
(a) Educational:
(i) 2002-2006: Ph.D. (Dr. rer. nat.) in applied physics, University of Duisburg-Essen, Duisburg, Germany, Grade: “very good”
(ii) 1999-2001: Masters of Science, Utkal University, Bhubaneswar, India, Result: First class.
(iii) 1996-1999: Bachelor of Science, Salipur College, Salipur, India, Result: First class with distinction.
(iv) 1994-1996: Intermediate, Salipur College, Salipur, India, Result: First Class.
(v) 1991-1994: High school, Banahara Highschool, Banahara, India, Result: First Class.
(b) Postdoctoral research experience:
(i) December 2006- December 2009: Postdoctoral researchers at University of Duisburg-Essen, Duisburg, Germany in the group of Prof. Wolfgang Kleemann.
(ii) 2009: Postdoctoral research associate in the department of physics at Princeton University, Princeton, USA.
(c) Inventions:
“A new sample holder construction for high temperature measurements in superconducting quantum interference device (SQUID) magnetometers” has been made with the co-operation of Prof. W. Kleemann, Dr. O. Petracic, and Mr. M. Aderholz [see Publication 4].
(d) Grants and Fellowships:
(i) DAE Young Achiever Award (YAA 2020) for the year 2020.
(ii) Visiting researcher for one month in the year 2019 at the International Center for Collaborative center of Institute of Material Research (ICC-IMR) at Tohoku University, Sendai, Japan
(iii) DAAD Research award to visit Forschungszentrum Juelich, Germany 2018
(iv) Visiting researcher for one month in the year 2015 at the International Center for Collaborative center of Institute of Material Research (ICC-IMR) at Tohoku University, Sendai, Japan
(v) “Young scientist award 2014” by Odisha Physical Society, Odisha, India.
(vi) Visiting associate professor for the year 2014 at the International Center for Collaborative center of Institute of Material Research (ICC-IMR) at Tohoku University, Sendai, Japan
(vii) Visiting researcher for one month in the year 2012 at the International Center for Collaborative center of Institute of Material Research (ICC-IMR) at Tohoku University, Sendai, Japan
(viii) Graduate college fellowships from the graduate college “Structure and Dynamics of heterogeneous systems” from May 2002 till April 2005.
(e) Employment experience:
-
Professor (1st July 2022 till present) at NISER, Bhubaneswar
-
Associate Professor (July 2016 - June 2022) at NISER, Bhubaneswar
-
Reader F (October 2012 - June 2016) at NISER, Bhubaneswar
-
Assistant professor (July 2010 - October 2012) at NISER, Bhubaneswar
-
Guest scientist (January - June 2016) at Forschungszentrum Juelich, Germany
Experience:
(a) Research Experience:
Working in the field of magnetism and main interests are magnetic nanoparticles, magnetic thin films, multiferroics and semiconductor quantum dots.
(b) Instrumentation Experience:
-
SQUID magnetometry and ac susceptometry
-
Magneto-optic Kerr effect (MOKE) magnetometry and (MOKE) microscopy
-
Polarized neutron reflectometry (PNR) and small angle neutron scattering (SANS)
-
Transmission X-ray microscopy (TXM)
-
Photoemission electron microscopy (PEEM)
-
Pulsed laser deposition (PLD)
-
Dielectric spectroscopy
-
Photolithography
-
E-beam lithography
-
Scanning electron microscopy (SEM)
-
Wirebounder
-
Little experiences with atomic and magnetic force microscopies (AFM, MFM), transmission electron microscopy (TEM), Mössbauer spectroscopy, and X-ray diffraction (XRD) analysis
(c) Academic and Professional Interests:
Condensed matter physics
(d) Publications: 100 (Total citations: ~ 3450)
For the list of publications please refer to the "publication" page