Contact Information

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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

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) “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

2) “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

3) “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) 4) “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)

5) “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

6) “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)

7) “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)

8) “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

9) “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

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

11) “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)

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

13) “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)

14) “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)

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

16) “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)

17) “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)

18) “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)

19) “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)

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

21) “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)

22) “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)

23) “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)

24) “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)

25) “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)

26) “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)

27) “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)

28) “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)

29) “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)

30) “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)

31) “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)

32) “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)

33) “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)

34) “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)

35) “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)

36) “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)

 
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