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Ashwin A. Tulapurkar
Department of Electrical Engineering
IIT Bombay, Powai
Mumbai 400076, India
Email: ashwin [AT] ee.iitb.ac.in
Phone:91-22-25767405

http://www.ee.iitb.ac.in/~spintronics/

Research Interests

My research interest are spintronics, quantum physics of nano-devices, spin torques, spin based oscillators, noise, thermoelectric effects etc.

Academic Background

* Ph.D., Tata Institute of Fundamental Research (TIFR), Mumbai, India 1999 * B. Tech. (Engineering Physics), Indian Institute of Technology, Mumbai,1992.

Work Experience

Professor, Indian Institute of Technology, Bombay, India, 2015-present
Associate Professor, Indian Institute of Technology, Bombay, India, 2009-2015
Osaka University, Osaka, Japan 2008-2009
Stanford Linear Accelerator Center, Stanford University, USA 2005-2008
National Institute for Advanced Industrial Science and Technology (AIST), Tsukuba, Japan 2002-2005
Tata Institute of Fundamental Research (TIFR), Mumbai, India 2000-2002

Journal Publications since 2004:

1) “Recent advances in the spin Nernst effect”, Arnab Bose and Ashwin A. Tulapurkar, Journal of Magnetism and Magnetic Materials, 491, 165526 (2019).

2) “Skyrmion based spin-torque nano-oscillator”, Debasis Das, Bhaskaran Muralidharan and Ashwin Tulapurkar, Journal of Magnetism and Magnetic Materials, 491, 165608 (2019).

3) “Mutual Synchronization of Spin-Torque Nano-Oscillators Via Oersted Magnetic Fields Created by Waveguides”, Hanuman Singh, S. Bhuktare, A. Bose, A. Fukushima, K. Yakushiji, S. Yuasa, H. Kubota, and Ashwin A. Tulapurkar, Phys. Rev. Applied 11, 054028 (2019).

4) “Direct observation of the reciprocity between spin current and phonon interconversion” , Swapnil Bhuktare, Ambika Shanker Shukla, Hanuman Singh, Arnab Bose, and Ashwin A. Tulapurkar, Appl. Phys. Lett. 114, 052402 (2019); https://doi.org/10.1063/1.5083207 (Selected as a featured article)

5) “Effects of Elastic Dephasing on Scaling of Ultra-Small Magnetic Tunnel Junctions”, Debasis Das , Ashwin Tulapurkar, and Bhaskaran Muralidharan, IEEE Transactions on Magnetics, 55, 1400404 (2019)

6) “Effect of B-site bismuth doping on magnetic and transport properties of La0.5Ca0.5Mn1−xBixO3 thin films”, Himanshu Sharma, Deepak Kumar, Ashwin Tulapurkar, CV Tomy, Journal of materials science, 52,130 (2019)

7) “Control of magnetization dynamics by spin-Nernst torque”, Arnab Bose, Ambika Shanker Shukla, Sutapa Dutta, Swapnil Bhuktare, Hanuman Singh, and Ashwin A. Tulapurkar, Phys. Rev. B 98, 184412 (2018).

8) “Self-Injection Locking of a Spin Torque Nano-Oscillator to Magnetic Field Feedback”, Hanuman Singh, A. Bose, S. Bhuktare, A. Fukushima, K. Yakushiji, S. Yuasa, H. Kubota, and Ashwin A. Tulapurkar, Phys. Rev. Applied 10, 024001 (2018).

9) “Observation of Anomalous Spin Torque Generated by a Ferromagnet”, Arnab Bose, D. D. Lam, S. Bhuktare, S. Dutta, H. Singh, Y. Jibiki, M. Goto, S. Miwa, and A. A. Tulapurkar, Phys. Rev. Applied 9, 064026 (2018).

10) “Direct detection of spin Nernst effect in platinum”, A. Bose, S. Bhuktare, H. Singh, S. Dutta, V. G. Achanta and A. A. Tulapurkar, Applied Physics Letters, 112, 162401 (2018); doi: 10.1063/1.5021731 (Featured on the cover page of vol 112, issue 16) cover_page_apl.jpg

11) “Band-pass Fabry-Perot magnetic tunnel junctions“, Abhishek Sharma, Ashwin A. Tulapurkar, and Bhaskaran Muralidharan, Applied Physics Letters, 112, 192404 (2018). https://doi.org/10.1063/1.5023159

12) “Sign Reversal of Fieldlike Spin-Orbit Torque in an Ultrathin Cr/Ni Bilayer”, Arnab Bose, Hanuman Singh, Varun Kumar Kushwaha, Swapnil Bhuktare, Sutapa Dutta, and Ashwin A. Tulapurkar, Phys. Rev. Applied 9, 014022 (2018)

13) “Scaling effects on spin transfer torque magnetic tunnel junctions”, D. Das, A. A. Tulapurkar and B. Muralidharan, IEEE Trans on Elec. Dev., 65, 724-732, (2018)

14) “Effect of external magnetic field on locking range of spintronic feedback nano oscillator”, Hanuman Singh, K. Konishi, A. Bose, S. Bhuktare, S. Miwa, A. Fukushima, K. Yakushiji, S. Yuasa, H. Kubota, Y. Suzuki, and A. A. Tulapurkar, AIP Advances 8, 056010 (2018); https://doi.org/10.1063/1.5007324

15) “Role of phase breaking processes on resonant spin transfer torque nano-oscillators”, Abhishek Sharma, Ashwin A. Tulapurkar, and Bhaskaran Muralidharan, AIP Advances 8, 055913 (2018); https://doi.org/10.1063/1.5007325

16) “Integer, Fractional, and Sideband Injection Locking of a Spintronic Feedback Nano-Oscillator to a Microwave Signal”, Hanuman Singh, K. Konishi, S. Bhuktare, A. Bose, S. Miwa, A. Fukushima, K. Yakushiji, S. Yuasa, H. Kubota, Y. Suzuki, and A. A. Tulapurkar, Phys. Rev. Applied 8, 064011 (2017)

17) “Resonant Spin-Transfer-Torque Nano-Oscillators”, Abhishek Sharma, Ashwin A. Tulapurkar, and Bhaskaran Muralidharan, Phys. Rev. Applied 8, 064014 (2017)

18) “Sensitive measurement of spin-orbit torque driven ferromagnetic resonance detected by planar Hall geometry”, Arnab Bose, Sutapa Dutta, Swapnil Bhuktare, Hanuman Singh, and Ashwin A. Tulapurkar, Appl. Phys. Lett. 111, 162405 (2017); doi: 10.1063/1.4999948

19) “Gyrator Based on Magneto-elastic Coupling at a Ferromagnetic/Piezoelectric Interface”, Swapnil Bhuktare, Arnab Bose, Hanuman Singh & Ashwin A. Tulapurkar, Scientific Reports (2017) | 7: 840 | DOI:10.1038/s41598-017-00960-9

20) “Characterization of Au/PbTi0.5Fe0.5O3/Si structure for possible multiferroic based non-volatile memory applications”, S. Nawaz, S. Roy, A. A. Tulapurkar, and V. R. Palkar, Journal of Applied Physics 121, 114105 (2017); doi: 10.1063/1.4978703

21) “Spintronic oscillator based on spin current feedback using the spin Hall effect”, Swapnil Bhuktare, Hanuman Singh, Arnab Bose, and Ashwin A. Tulapurkar, Physical Review Applied 7, 014022 (2017)

22) “Electric field controlled magnetization and transport properties of La0.7Ca0.3MnO3 ultrathin film”, Himanshu Sharma, Ashwin Tulapurkar, C.V. Tomy, Materials Chemistry and Physics, 186, 523-527 (2017)

23) “Possible spin gapless semiconductor type behaviour in CoFeMnSi epitaxial thin films”, Varun K. Kushwaha, Jyoti Rani, Ashwin Tulapurkar, and C. V. Tomy, Appl. Phys. Lett. 111, 152407 (2017). https://doi.org/10.1063/1.4996639

24) “Abrupt p-n junction using ionic gating at zero-bias in bilayer graphene”, Grover S, Joshi A, Tulapurkar A, Deshmukh M M, Scientific Reports. (2017) ;7:3336. doi:10.1038/s41598-017-03264-0.

25) “Electric field controlled magnetization and charge-ordering in Pr0.6Ca0.4MnO3”, Himanshu Sharma, M.R. Lees, G. Balakrishnan, D. McK. Paul, A. Tulapurkar, C.V. Tomy, Materials Chemistry and Physics, 194, 142-146 (2017). https://doi.org/10.1016/j.matchemphys.2017.03.029

26) “Ultrasensitive Nanoscale Magnetic-Field Sensors Based on Resonant Spin Filtering”, Abhishek Sharma; Ashwin Tulapurkar; Bhaskaran Muralidharan, IEEE Transactions on Electron Devices, 63, 4527 (2016). DOI: 10.1109/TED.2016.2606354

27) “Coherent microwave generation by spintronic feedback oscillator”, Dinesh Kumar, K. Konishi, Nikhil Kumar, S. Miwa, A. Fukushima, K. Yakushiji, S. Yuasa, H. Kubota, C. V. Tomy, A. Prabhakar, Y. Suzuki, A. Tulapurkar, Scientific Reports 6, 30747 (2016)

28) “Observation of thermally driven field-like spin torque in magnetic tunnel Junctions”, Arnab Bose , Amit Kumar Shukla , Katsunori Konishi , Sourabh Jain , Nagarjuna Asam, Swapnil Bhuktare , H. Bana , Duc Duong Lam , Yuya Fujii , Shinji Miwa , Yoshishige Suzuki , Ashwin A. Tulapurkar, Appl. Phys. Lett. 109, 032406 (2016)

29) “Sign reversal of angular dependence of Planar Hall Effect in La0.7Ca0.3MnO3/SrTiO3 ultrathin film”, Himanshu Sharma, Hanuman Bana, Ashwin Tulapurkar, C.V. Tomy , Materials Chemistry and Physics 180 (2016) 5-8

30) “Planar Nernst and Hall effect in patterned ultrathin film of La0.7Sr0.3MnO3”, Himanshu Sharma, Hanuman Bana, Ashwin Tulapurkar, C.V. Tomy, Materials Chemistry and Physics 180 (2016) 390-395

31) “Proposal for a Domain Wall Nano-Oscillator driven by Non-uniform Spin Currents”, Sanchar Sharma, Bhaskaran Muralidharan & Ashwin Tulapurkar, Scientific Reports 5, 14647 (2015).

32) “Sign reversal of anisotropic magnetoresistance in La0.7Ca0.3MnO3/SrTiO3 ultrathin films”, Himanshu Sharma, A. Tulapurkar and C. V. Tomy, Applied Physics Lett., 105 , 222406, (2014)

33) “Enhancement of Spin-transfer torque switching via resonant tunnelling”, Niladri Chatterji, Ashwin. A. Tulapurkar and Bhaskaran Muralidharan, Appl. Phys. Lett., 105, 232410 (2014)

34) “Optimization of La0.7Sr0.3MnO3 thin film by pulsed laser deposition for spin injection”, Sourabh Jain, Himanshu Sharma, Amit Kumar Shukla, C.V. Tomy, V.R. Palkar, Ashwin Tulapurkar, Physica B: Condensed Matter, 448, 103 (2014)

35) “Magneto-Seebeck effect in spin-valve with in-plane thermal gradient”, S. Jain, D. D. Lam, A. Bose, H. Sharma, V. R. Palkar, C. V. Tomy, Y. Suzuki, and A. A. Tulapurkar, AIP Advances 4, 127145 (2014). (Selected as Editor’s pick)

36) “Photonic crystal-based polarization selector for planar architectures”, Richa Goel, Ashwin Tulapurkar ; Achanta Venu Gopal , Journal of Nanophotonics 8(1), 083891 (2014)

37) “Radio-frequency amplification property of the MgO-based magnetic tunnel junction using field-induced ferromagnetic resonance”, K. Konishi, D. K. Dixit, A. A. Tulapurkar, S. Miwa, T. Nozaki, H. Kubota, A. Fukushima, S. Yuasa, and Y. Suzuki, Appl. Phys. Lett. 102, 162409 (2013)

38) “Spintronic oscillator based on magnetic field feedback”, D. Dixit, K. Konishi, C. V. Tomy, Y. Suzuki, and A. A. Tulapurkar, Appl. Phys. Lett. 101, 122410 (2012)

39) “Spin control by application of electric current and voltage in FeCo-MgO junctions”, Suzuki Yoshishige, Kubota Hitoshi, Tulapurkar Ashwin, Takayuki Nozaki, Philosophical Transactions of the Royal Society of Mathematical Physical and Engineering Sciences, 369, 3658 (2011)

40) “Images of a Spin-Torque-Driven Magnetic Nano-Oscillator”, X. W. Yu, V. S. Pribiag, Y. Acremann, A. A. Tulapurkar, T. Tyliszczak, K. W. Chou, B. Bräuer, Z.-P. Li, O. J. Lee, P. G. Gowtham, D. C. Ralph, R. A. Buhrman, and J. Stöhr, Phys. Rev. Lett. 106, 167202, (2011)

41) “Boltzmann approach to dissipation produced by a spin-polarized current”, A. A. Tulapurkar and Y. Suzuki, Phys. Rev. B 83, 012401 (2011)

42) “Contribution of electron–magnon scattering to the spin-dependent Seebeck effect in a ferromagnet”, A. A. Tulapurkar and Y. Suzuki, Solid State Communications (Special issue on Spin-caloritronics) 150, 466, March (2010)

43) “Spin-transfer-torque-induced ferromagnetic resonance for Fe/Cr/Fe layers with an antiferromagnetic coupling field layers with an antiferromagnetic coupling field”, Takeshi Seki, Hiroyuki Tomita, Ashwin A. Tulapurkar, Masashi Shiraishi, Teruya Shinjo and Yoshishige Suzuki, Appl. Phys. Lett. 94, 212505 (2009)

44) “Time-resolved x-ray imaging of magnetization dynamics in spin-transfer torque devices”, V. Chembrolu, J. P. Strachan, X. W. Yu, A. A. Tulapurkar, T. Tyliszczak, J. A. Katine, M. J. Carey, J. Stöhr, and Y. Acremann, Phys. Rev. B 80, 024417 (2009)

45) “Large voltage-induced magnetic anisotropy change in a few atomic layers of iron”, T. Maruyama, Y. Shiota, T. Nozaki, K. Ohta, N. Toda, M. Mizuguchi1, A. A. Tulapurkar, T. Shinjo, M. Shiraishi, S. Mizukami, Y. Ando & Y. Suzuki, Nature Nanotechnology 4, 158 - 161 (2009)

46) “Direct Observation of Spin-Torque Driven Magnetization Reversal through Nonuniform Modes”, J. P. Strachan, V. Chembrolu, Y. Acremann, X. W. Yu, A. A. Tulapurkar, T. Tyliszczak, J. A. Katine, M. J. Carey, M. R. Scheinfein, H. C. Siegmann, and J. Stöhr, Phys. Rev. Lett. 100, 247201 (2008)

47) “Rectification of radio frequency current in ferromagnetic nanowire”, Yamaguchi, H. Miyajima, T. Ono, Y. Suzuki, S. Yuasa, A. Tulapurkar, and Nakatani, Applied Physics Letters, 90, 182507 (2007)

48) “Ultrahigh speed spin-transfer magnetization switching in magnetic multilayers”, Suzuki Y, Tulapurkar A, Yagami K, Devolder T, Fukushima A, Kubota H, Yuasa S, Crozat P, Chappert C, Japanese Journal of Applied Physics, 45, 3842 (2006)

49) “Spin-torque diode effect in magnetic tunnel junctions”, A. Tulapurkar, Y. Suzuki, A. Fukushima, H. Kubota, H. Maehara, K. Tsunekawa, D. D. Djayaprawira, N. Watanabe, and S. Yuasa, Nature 438, 339 (2005)

50) “Inspection of intrinsic critical currents for spin-transfer magnetization switching”, Yagami K, Tulapurkar AA, Fukushima A, Suzuki Y, IEEE Transactions on Magnetics, 41, 2615 (2005)

51) “Temperature study of the spin-transfer switching speed from dc to 100 ps”, T. Devolder, A. Tulapurkar, Y. Suzuki, C. Chappert, P. Crozat, and K. Yagami, Journal of Applied Physics, 98, 053904 (2005)

52) “Estimation of thermal durability and intrinsic critical currents of magnetization switching for spin-transfer based magnetic random access memory”, K. Yagami, A. A. Tulapurkar, A. Fukushima, and Y. Suzuki, Japanese Journal of Applied Physics 97, 10C707 (2005)

53) “Instability threshold versus switching threshold in spin-transfer-induced magnetization switching”, T. Devolder, P. Crozat, C. Chappert, J. Miltat, A. Tulapurkar, Y. Suzuki, K.Yagami, Physical Review B 71, 184401 (2005)

54) “Precharging strategy to accelerate spin-transfer switching below the nanosecond”, T. Devolder, C. Chappert, P. Crozat, A. Tulapurkar, Y. Suzuki, J. Miltat, K.Yagami, Applied Physics Letters, 86, 062505 (2005)

55) “Peltier Effect in Sub-micron-Size Metallic Junctions”, Akio Fukushima, Kojiro Yagami, Ashwin A. Tulapurkar, Yoshishige Suzuki, Hitoshi Kubota, Atsushi Yamamoto, and Shinji Yuasa, Japanese Journal of Applied Physics, Part 2 44, L12 (2005)

56) “Ultra-fast magnetization reversal in magnetic nano-pillars by spin-polarized current”, Devolder T., Tulapurkar A., Yagami K., Crozat P., Chappert C., Fukushima A., Suzuki Y., Journal of Magnetism and Magnetic Materials, 286, 77 (2005)

57) “Low-current spin-transfer switching and its thermal durability in a low-saturation-magnetization nanomagnet”, K. Yagami, A. A. Tulapurkar, A. Fukushima, and Y. Suzuki, Applied Physics Letters, 85, 5634 (2004)

58) “Subnanosecond magnetization reversal in magnetic nanopillars by spin angular momentum transfer”, A. Tulapurkar, T. Devolder, K. Yagami, P. Crozat, C. Chappert, A. Fukushima, Y. Suzuki, Applied Physics Letters, 85, 5358 (2004)

faculty/ashwin.txt · Last modified: 2019/07/24 05:20 (external edit)