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
Invited lectures given at research institutes and universities
Plenary and Keynote talks:
1) Plenary talk at 56th DAE Solid State physics symphosium at SRM university, Chennai, India in December 2011.
2) Keynote talk at symposium “supermagnetism” at National Institute of Materials Science (NIMS), Tsukuba, Japan in May 2013.
3) Plenary talk at MLZ neutron conference held at Muenich, Germany in June 2019.
Title: New routes towards spintronics with organic semiconductors, topological insulators and antiferromagnets
4) Chief guest at the Science Day at Centurion University, Jatni, Odisha: “Magnetic nanotechnology- Past, present and future”
5) Keynote speaker at “IEEE Magnetics Symposium”, Singapore, 2020
Title: Spin pumping in heterostructures with heavy metals, topological insulators and antiferromagnets
6) Panelist at “VAIBHAV summit”, Quantum Materials and Devices, 2020 at IIT Bombay. This meeting was organized by the principal scientific advisor of the Government of India.
7) Plenary talk at “National e-seminar (discovering the small World)”, 2020 hosted by The Neotia University, Kolkata
Title: Excitements in Nanomagnetism
8) Plenary lecture at “World Nanotechnology Marathon, organized by IEEE Nanotechnology”, November 2021
Title: Spintronics with Heavy Metals, Topological Insulators and Antiferromagnetics
9) Plenary speaker at “Around-the-Clock Around-the-Globe Magnetics (AtC-AtG 2021) Conference”, organized by IEE Magnetic Society, August 2021
Title: Spintronics with Fullerene
10) Chief guest and plenary speaker at the Science Day at Centurion University, Jatni, Odisha,
Title: Magnetic nanotechnology- Past, present and future
Invited talks:
1) In conference at School of technology, Banaras Hindu University, India in February 2011
2) International conference on Functional Materials at Harish Chandra research institute, Allahabad, India in April 2011
3) International workshop on functional materials at NIST, Berhampur, India, December 2011.
4) ICMAGMA-2013 (international conference on magnetism and magnetic materials) held at IIT Guwahati, India in 2015.
5) UK-India workshop on magnetization processes held at Durham University, UK in March 2015.
6) ICMAGMA-2015 (international conference on magnetism and magnetic materials) held at VIT, Vellore, India in December 2015.
7) Conference on Emerging materials (CEMAT-2016) held at IISc, Bangalore in July 2016.
Title: Effect of anisotropy, interactions and interface on domains and domain walls in ferromagnetic films
8) Indo-Japan workshop held at Tohoku University, Japan in December 2016.
Title: Effect of anisotropy, interactions and interface on domains and domain walls in ferromagnetic films
9) Nano India 2017 conference held at IIT Delhi in March 2017.
Title: Exploring Nanomagnetism
10) Indian National Science Academy (INSA) annual meeting held at NISER, Bhubaneswar in December 2016.
Title: Exploring Nanomagnetism
11) DAE Solid state physic s symposium (SSPS-2016) held at KIIT University in December 2016.
Title: Effect of anisotropy, interactions and interface on domains and domain walls in ferromagnetic films
12) International Union for material research society for young researchers (IUMRS 2016) held at IISc, Bangalore in December 2016.
Title: Creating magnetic Fullerene at the interface between Fe/C60 thin films
13) Conference of Emerging trends in physics held at North Odisha University held in March 2017.
Title: Effect of anisotropy, interactions and interface on domains and domain walls in ferromagnetic films
14) Faculty orientation programme held at Utkal University in March 2017.
Title: Exploring Nanomagnetism via Architecture and Interface
15) Conference “Bringing the nanoworld together (BTNT-2017) held at University of Hyderabad, India.
Title: Exploring Nanomagnetism
16) Conference “Recent trends in condensed matter physics (RTCMP-2018)” held at Indian Association for cultivation of sciences (IACS), Kolkata.
Title: Spinterface with Fullerene
17) Conference “Current trends in material science and engineering (CTMSE-2018)” held at S. N. Bose center for Basics Sciences (SNBCBS), Kolkata.
Title: Interface induced magnetism and spin pumping
18) Odisha Physical Society annual convention held at BJB College, Bhubaneswar.
Title: Exploring Nanomagnetism
19) Meeting on Condensed Matter Physics held at NISER.
Title: Magnetization static and dynamics in dots and antidot lattices
20) International conference on Microscopy 2018, Bhubaneswar
Title: “Magnetic domain imaging via magneto-optic Kerr microscopy”.
21) “Discussion meeting on Recent Advances in Magnetism(DMRAM-2019)” held at IIT Mandi
Title: Magnetization Reversal in magnetic dot and antidot lattices.
22) The Indo-Singapore meeting organized by Institute of Physics, Bhubaneswar in March 2019.
Title: Inverse spin Hall effect in electron bean evaporated topological insulator Bi2Se3 thin film.
23) 2nd Annual meeting on “Physics of Strongly correlated electron systems” held at IIT Delhi.
Title: Inverse Spin Hall Effect in Electron Beam Evaporated Topological Insulator Bi2Se3Thin Film
24) Conference “Progress in Material Science Research (PMSR 2020) during February 2020 at Dibrugarh University, Assam
Title: Exploring Nanomagnetism via Architecture and Interface
25) Conference “Recent Advances in Magnetism (RAM 2019)" held at IIT Mandi in May 2019.
Title: Magnetization reversal in dots and antidot lattices
26) “Quantum Material symposium” held at NISER, Bhubaneswar in May 2019
Title: Magnetism at the nanoscale
27) Conference on Quantum Matter Heterostructures (QMH 2020) held in February 2020 organized by Institute of Physics, Bhubaneswar.
Title: Inverse spin Hall effect in systems with heavy metals, topological insulators and antiferromagnets
28) Talk at NISER SPS day 2019.
Title: Exploring Nanomagnetism via Architecture and Interface
29) “Frontiers of Material Science and Photonics: Issues and Developments (NCFMSP-2020) held at Purulia University, Purulia, India in March 2020.
Title: Excitements in nanomagnetism
30) “Functional Materials for Emerging Technology; FMET-2020” held at Silicon Institute of Technology, Bhubaneswar, in February 2020.
Title: Can we modify magnetism via architecture and interface engineering?
31) “ICEE, 2020” held at IIT Delhi, held in November 2020
Title: Spinterface with fullerene
32) “ETRMCMMSN”, 2020 held at The Neotia University, Kolkata in December 2020
Title: Exploring Nanomagnetism via interactions, architecture and interface engineering
33) Webinar Series on “Recent Advances in Physics” organised by Department of Physics, NIT Meghalaya, 2020
Title: Tuning magnetic properties via architecture and interface
34) “QMAT 2020”, 2020 held at S. N. Bose Center for Basic Sciences, Kolkata in September 2020
Title: Spin pumping and inverse spin Hall effect with topological insulators and antiferromagnets
35) “Progress in Material Science Research (PMSR 2020)” held at Dibrugarh University, Assam, February 2020
Title : Exploring Nanomagnetism via Architecture and Interface
36) “International Conference on Advanced Physics (IEMPHYS), held by IEM, Kolkata, 2021
Title: Inverse spin Hall effect in system either heavy metals, topological insulators and antiferromagnets
37) “Functional Materials for Emerging Technology (FMET-2021)” held at Silicon Institute of Technology, Bhubaneswar in March 2021.
Title: Exploring Nanomagnetism via anisotropy, architecture and interface engineering
38) “National Conference on Low Dimensional Systems: Properties and Applications (LDSPA-2021)”, 2021 held at SOA University, Bhubaneswar.
Title: Spinterface physics: making non-magnetic organic semiconductors magnetic
39) “Materials Oceania”, 2021 organized by The University of Queensland, Australia
Title: High Spin Mixing Conductance and Spin Interface Transparency at the interface of a Co2Fe0.4Mn0.6Si Heusler Alloy and Pt
40) “Recent advances in magnetism and spintronics (NS – MagSpin – 2021)”, held at IIT Hyderabad in December 2021
Title: Organic Spintronics with Fullerene
41) “UGC sponsored faculty orientation program” organized by Mumbai University, 2021
Title: Nanomagnetism in dots and antidot lattices
42) “Symposium- Semiconductor devices for Quantum Technologies- 2021” held at IIT Delhi in December 2021
Title: Spintronics with organic semiconductors, topological insulators, and chalcogenides
43) “UGC sponsored faculty orientation program”, organized by Mumbai University, 2021
Title: Exploring magnetism via interface engineering
44) “National Conference on Functional Materials: Synthesis, Properties and Applications, 2022” held at Aligarh Muslim University, Aligarh in February 2022
Title: Organic spintronics – a new playground for exciting physics
45) “Indo-Japan workshop on interface phenomena in Spintronics (IJW-IPS 2022)” held at NISER Bhubaneswar in March 2022.
Title: Organic spintronics – a new playground for exciting physics
46) HBNI Interaction Meeting on Condensed Matter Physics held at SINP, Kolkata in June 2022
Title: Spintronics with fullerene
47) "One Day Hybrid Workshop on Advanced Magnetic Materials and Applications" organized by IIT Hyderabad in July 2022.
Title: Interface Magnetism
48) "4th International Conference on Current Trends in Materials Science and Engineering (CTMSE 2022)" organized by department of basic science and humanities, Institute of Engineering & Management, Kolkata in July 2022.
Title : Study of Domain wall dynamics and interfacial Dzyaloshinskii-Moriya interaction in HM/FM multilayer thin film
Invited talks at Universities/Institutions
-
Physics seminar at Indian Institute of Technology, Patna in February 2011
-
Physics seminar Indian Institute of Technology, Bombay in February 2011
-
Physics seminar Physics Department, Utkal University, Bhubaneswar in March 2011
-
Physics Colloquium at solid state physics division at BARC, Mumbai in July 2011.
-
Physics seminar at condensed matter physics division at TIFR, Mumbai in July 2011.
-
Physics seminar at Institute of material research (IMR), Tohoku University, Sendai, Japan in June 2012.
-
Physics seminar at S. N. Bose institute for basic science, Kolkata in August 2012.
-
Institute Colloquium at National Institute of Technology (NIT), Rourkela, Odisha in September 2012
-
Physics seminar at department of physics at Sambalpur University, Sambalpur, Odisha in September 2012
-
Physics seminar at department of physics at University Duisburg-Essen, Duisburg, Germany in December 2012.
-
Physics seminar at IGCAR, Kalpakkam in 2013
-
Physics seminar at physics department in IIT Kharagpur in 2013.
-
Physics seminar at Inter-University accelerator center (IUAC), New Delhi in 2013.
-
Physics seminar at University of Mainz, Germany in 2013.
-
Physics seminar at Forschungszentrum Rosendorf, Germany in 2014.
-
Physics seminar at IFW, Dresden, Germany in 2014.
-
Physics seminar at Forschungszentrum Juelich, Germany in 2014.
-
Physics seminar at IISER, Pune in 2014.
-
Physics seminar at Ravenshaw University, Cuttack in 2014.
-
Physics seminar at Saha Institute of Nuclear Physics (SINP), Kolkata in May 2014
-
Physics seminar at Forschungszentrum Rosendorf, Germany in May 2014.
-
Physics seminar at S. N. Bose Center for Basic Science Kolkata in May 2014
-
Physics seminar at Indian Association for Cultivation of Sciences (IACS), Kolkata in February 2015
-
Physics seminar at the physics department of physics, Indian Institute of Technology (IIT, Delhi) in January 2016.
-
Physics Seminar at the Institute of Physics Polish Academy of Sciences, Warsaw, Poland in February 2016.
-
Physics colloquium at physics department of University of Bialystok, Bialystok, Poland in March 2016.
-
Department of metallurgical enginnering, IIT Bombay in July 2016.
Title: Magnetization reversal in dot, antidot and multilayer systems
28. Department of physics at IIT Delhi in December 2016.
Title: Engineering magnetic domains and domain walls
29. IISER, Mohali in October 2016.
Title: Effect of anisotropy, interactions and interface
on domains and domain walls in ferromagnetic films
30. Trident Institute of Technology, Bhubaneswar in August 2016.
Title: Magnetic Nanotechnology, Past, Present and Future.
31. Defense Metallurgical research laboratory (DMRL), Hyderabad in March 2017.
Title: Effect of anisotropy, interactions and interface on domains and domain walls in ferromagnetic films
32. Sikshya O Anusandhan University (SOA), Bhubaneswar in October 2017
Title: Exploring Nanomagnetism
33. Physics Colloquium at IIT, Guwahati, India in January 2018
Title: Exploring Nanomagnetism
34. Utkal University in Faculty orientation program 2018
Title: Magnetic thin films and multilayers
35. Invited lecture series at Faculty orientation program organized by Indian National Science Academy (INSA)
Titles: (i) Vacuum Technology and Nanotechnology, (ii) Survey of various thin film deposition techniques, (iii) Surface tipography imaging via scanning probe microscopy and scanning tunneling microscopy
36. Forschungszentrum Juelich, Germany 2018
Title: Magnetism due to and at interfaces
37. Institute of Nanoscience and Technology (INST), Chandigarh
Title: Manipulating and/or creating magnetism by architecture and interface
38. Delhi University, New Delhi:
Title: Nanomagnetism in dots and antidot lattices
39. IIT Madras,India 2018
Title: Magnetism at the interfaces and in nanostructures
40. Forschungszentrum Juelich, Germany
Title: Magnetism due to and at interfaces
41. Laboratory of Solids of University of Paris-Sued, France in 2018
Title: Interface induced Magnetism and spin pumping
42. Delhi University in May 2019
Title: Nanomagnetism in dots and antidot lattices
43. University Duisburg-Essen (Campus-Essen) in June 2019.
Title: Manipulating and/or creating magnetism via architecture and interface
44. IISER Berhampur in October 2019.
Title: Exploring Nanomagnetism via architechture and interface
45. Institute of Material Science, Tohoku University, Sendai, Japan in July 2019.
Title: Inverse spin Hall effect in systems with heavy metals, topological insulators and antiferromagnets
46. Institute of Nanoscience and Technology (INST), Mohali in May 2019.
Title: Manipulating and/or creating magnetism by architecture and interface
47. University Paris-Saclay in November 2019.
Title: Inverse spin Hall effect in systems with heavy metals, topological insulators and antiferromagnets
48. The Neotia University, Kolkata in July 2019.
Title: Exploring Nanomagnetism.
49. National Institute of Material Science (NIMS), Tsukuba, Japan in July 2019.
Title: Inverse spin Hall effect in systems with heavy metals, topological insulators and antiferromagnets
50. Strasbourg University, Strasbourg, France in November 2019.
Title: Spinterface with Fullerene.
51. Utkal University, Bhubaneswar in November 2019.
Title: The excitements in nanomagnetism.
52. S. N. Bose Center for Basic Science, Kolkata in February 2020.
Title: Exploring Nanomagnetism via architechture and interface engineering
53. BK Mohanty memorial lecture at Ravenshaw University in February 2020.
Title: Excitements in Nanomagnetism.
54. NPL, Delhi, 2021
Title: Exploring Nano magnetism via architecture and interface engineering
55. S. N. Bose National Center for Basic Sciences, Kolkata in June 2022
Title: Spin to charge conversion with heavy metals, topological insulators and antiferromagnets
56. Interaction meeting on condensed matter physics of HBNI constituent institutes held at SINP, Kolkata in June 2022
Title: Spintronics with Fullerene
Contributory:
1) Contributed talk at the international conference “Metallic multilayers (MML) 2013 in May 2013 in Kyoto, Japan.
2) “International conference on Metallic multilayers (MML 2016)” held at Uppsala University, Sweden, June 2016
Title: Formation of 360 degree domain walls: a competing effect of uniaxial and random anisotropy
3) Contributory talk at International Conference on Magnetism (Intermag 2018)” held at Singapore
Title: “Spinterface induced magnetic properties in Fe or Co thin films
4) Talk at NISER SPS day 2019
Title: Exploring Nanomagnetism via Architecture and Interface
5) “Trends in Magnetism (TMAG-2021)”, 2021 held in Italy.
Title: Spinterface with Fullerene