Electrical Engineering

Indian Institute of Technology Bombay

People

People

Faculty

Ashwin A. Tulapurkar
Qualifications

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

Research Interests

• Spintronics
• Physics of nano-devices
• Spin-current induced magnetization switching
• RF properties of spintronic devices
• Noise
• Thermoelectric effects

Work Experience

• Professor, IIT. Bombay, India, 2015-present
• Associate Professor, IIT. 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 Papers


  1. Debasis Das, Ashwin Tulapurkar, and Bhaskaran Muralidharan, "Scaling Projections on Spin-Transfer Torque Magnetic Tunnel Junctions", IEEE Transactions on Electron Devices, vol. 65, pp. 724-732, Feb. 2018. [DOI]
  2. A. A. Tulapurkar and Y. Suzuki, "Boltzmann approach to dissipation produced by a spin-polarized current", Phys. Rev. B, vol. 83, 2011.
  3. A. A. Tulapurkar and Y. Suzuki, "Contribution of electron-magnon scattering to spin-dependent Seebeck effect in a ferromagnet", Solid State Communications (special issue on Spin-caloritronics), vol. 150, pp. 466, 2010.
  4. T. Maruyama, Y. Shiota, T. Nozaki, K. Ohta, N. Toda, M.Mizuguchi, A. A. Tulapurkar, T. Shinjo, M. Shiraishi, S. Mizukami, Y. Ando, Y. Suzuki, "Large voltage-induced magnetic anisotropy change in a few atomic layers of iron", Nature Nanotechnology, vol. 4, pp. 158-161, Jan. 2009.
  5. Takeshi Seki, Hiroyuki Tomita, Ashwin A. Tulapurkar, Masashi Shiraishi, Teruya Shinjo, and Yoshishige Suzuki, "Spin-transfer-torque-induced ferromagnetic resonance for Fe/Cr/Fe layers with an antiferromagnetic coupling field", Appl. Phys. Lett., vol. 94, 2009.
  6. 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. Stohr, "Direct Observation of Spin-Torque Driven Magnetization Reversal through Nonuniform Modes", Physical Review Letters, vol. 100, 2008.
  7. Yamaguchi, H. Miyajima, T. Ono, Y. Suzuki, S. Yuasa, A. Tulapurkar, and Nakatani, "Rectification of radio frequency current in ferromagnetic nanowire", Applied Physics Letters, vol. 90, 2007.
  8. Suzuki Y, Tulapurkar A, Yagami K, Devolder T, Fukushima A, Kubota H, Yuasa S, Crozat P, Chappert C, "Ultrahigh speed spin-transfer magnetization switching in magnetic multilayers", Japanese Journal of Applied Physics, vol. 45, 2006.
  9. Yagami K, Tulapurkar AA, Fukushima A, Suzuki Y, "Inspection of intrinsic critical currents for spin-transfer magnetization switching", IEEE Transactions on Magnetics, vol. 41, pp. 2615, 2005.
  10. T. Devolder, P. Crozat, C. Chappert, J. Miltat, A. Tulapurkar, Y. Suzuki, K.Yagami, "Instability threshold versus switching threshold in spin-transfer-induced magnetization switching", Physical Review B, vol. 71, 2005.
  11. T. Devolder, C. Chappert, P. Crozat, A. Tulapurkar, Y. Suzuki, J. Miltat, K.Yagami, "Precharging strategy to accelerate spin-transfer switching below the nanosecond", Applied Physics Letters, vol. 86, 2005.
  12. T. Devolder, A. Tulapurkar, Y. Suzuki, C. Chappert, P. Crozat, and K. Yagami, "Temperature study of the spin-transfer switching speed from dc to 100 ps", Journal of Applied Physics, vol. 98, 2005.
  13. K. Yagami, A. A. Tulapurkar, A. Fukushima, and Y. Suzuki, "Estimation of thermal durability and intrinsic critical currents of magnetization switching for spin-transfer based magnetic random access memory", Japanese Journal of Applied Physics, vol. 97, 2005.
  14. Devolder T., Tulapurkar A., Yagami K., Crozat P., Chappert C., Fukushima A., Suzuki Y, "Ultra-fast magnetization reversal in magnetic nano-pillars by spin-polarized current", Journal of Magnetism and Magnetic Materials, vol. 286, 2005.
  15. Akio Fukushima, Kojiro Yagami, Ashwin A. Tulapurkar, Yoshishige Suzuki, Hitoshi Kubota, Atsushi Yamamoto, and Shinji Yuasa, "Peltier Effect in Sub-micron-Size Metallic Junctions", Japanese Journal of Applied Physics, vol. 44 (Part 2), 2005.
  16. A. Tulapurkar, Y. Suzuki, A. Fukushima, H. Kubota, H. Maehara, K. Tsunekawa, D. D. Djayaprawira, N. Watanabe, and S. Yuasa, "Spin-torque diode effect in magnetic tunnel junctions", Nature, 2005.
  17. K. Yagami, A. A. Tulapurkar, A. Fukushima, and Y. Suzuki, "Low-current spin-transfer switching and its thermal durability in a low-saturation-magnetization nanomagnet", Applied Physics Letters, vol. 85, 2004.
  18. A. Tulapurkar, T. Devolder, K. Yagami, P. Crozat, C. Chappert, A.F ukushima, Y. Suzuki, "Subnanosecond magnetization reversal in magnetic nanopillars by spin angular momentum transfer", Applied Physics Letters, vol. 85, 2004.
  19. Kundaliya D.C., Vij R., Kulkarni R.G., Tulapurkar A.A., Pinto R., Malik S.K., Yelon W.B., "Structural, magnetic and magnetotransport properties of the La0.67Ca0.33Mn0.9Fe0.1O3 perovskite", Journal of Magnetism and Magnetic Materials, vol. 264, pp. 62, 2003.
  20. Darshan C. Kundaliya, A. A. Tulapurkar, S. R. Shinde, R. Pinto,W. B. Yelon, R. G. Kulkarni, and S. K. Malik, "Giant magnetoresistance properties of the La1-2xRxAxMnO3 (R=Nd, A=Ca) perovskites", Journal of Applied Physics, vol. 93, 2003.
  21. S.N. Mishra, P. Taneja, P. Ayyub, A. A. Tulapurkar, "Local magnetism of Fe in Ag nanoparticles", Physica B, vol. 312, pp. 162-164, 2002.
  22. Kundaliya DC, Vij R, Tulapurkar AA, Vaidya U, Pinto R, Kulkarni RG, "Temperature hysteretic effect and its influence on colossal magnetoresistance of La0.33Nd0.33Ca0.33MnO3", Pramana-Journal of Physics, vol. 58, 2002.
  23. Kundaliya DC, Tulapurkar AA, John J, Pinto R, Kulkarni RG, "Enhanced temperature-independent magnetoresistance below the metal-insulator transition temperature of epitaxial La0.2Nd0.4Ca0.4MnO3 thin films", Pramana-Journal of Physics, vol. 58, 2002.
  24. Kundaliya D.C., Tulapurkar A.A., Pinto R., Kumar R., Kulkarni R.G., "A comparative study of magnetotransport and magnetization in epitaxial La0.6Nd0.2Ca0.2MnO3 unirradiated and heavy ion irradiated thin films", Solid state Communications, vol. 122, 2002.
  25. D. Pal, S. Sarkar, A. Tulapurkar, S.Ramakrishnan, A. K. Grover, G. Ravikumar, D. Dasgupta, Bimal K. Sarma, C. V. Tomy, G. Balakrishnan, D Mck Paul, "Comparison of the history effects in magnetization in weakly pinned crystals of high Tc and low Tc superconductors", Superconducting Science and Technology, vol. 15, pp. 254-257, 2002.
  26. D. C. Kundaliya, A. A. Tulapurkar, J. John, R. Pinto, R. G. Kulkarni, "Giant magnetoresistance in perovskite-like La0.6Nd0.2Ca0.2MnO3 thin films", Physica B, vol. 312, pp. 745-746, 2002.
  27. A. Tulapurkar, A. K. Grover, S. Ramakrishnan, A. Niazi, A. K. Rastogi, "Peak effect studies in 2H-NbS2", Physica B, vol. 312, pp. 118-119, 2002.
  28. S. Demuynch, S.N. Mishra, A.A. Tulapurkar, S. Cottenier, J.Meersschaut, M. Rots, "Spin fluctuations in Y1-xScxMn2 and Y(M n1-xAlx)2 observed by perturbed-angular correlation spectroscopy", Physica B, vol. 293, 2001.
  29. A.Tulapurkar, D. Heidarian, S. Sarkar, S. Ramakrishnan, A. K. Grover, E.Yamamoto, Y. Haga, M. Hedo, Y. Inada and Y. Onuki, "Elucidation of the stable state vortex state across the peak effect region in CeRu2", Physica C, vol. 355, 2001.
  30. A. Tulapurkar, "Critical current density from magnetization hysteresis data using the critical-state model", Physical Review B, vol. 64, 2001.
  31. A.Tulapurkar, S.N. Mishra, R.G. Pillay, H. Salunke, G. P. Das and S. Cottenier, "Local magnetism of isolated Mo atoms at substitutional and interstitial sites in Yb metal: Experiment and theory", Physical Review Letters, vol. 85, 2000.
  32. A.Tulapurkar and S. N. Mishra, "Magnetic and quadrupole interaction studies at 111Cd in GdMn2 and TbMn2", Hyperfine Interactions, vol. 120/121, pp. 247, 1999.
  33. A. Tulapurkar, S. N. Mishra, E. V. Sampathkumaran, "Local magnetism of Ce in the Kondo lattice compound CeFeGe3", Hyperfine Interactions, vol. 120/121, pp. 199, 1999.
  34. A. Tulapurkar, S. N. Mishra and Z. Hossain, "Local magnetism of Ce in CeNi2B2C: A PAC study", Hyperfine Interactions, vol. 120/121, pp. 225-229, 1999.
  35. V.V. Krishnamurthy, A. A. Tulapurkar, S. N. Mishra, S. K. Malik, D. T. Adroja, B. D. Rainford, "TDPAC Study of Ce Local Susceptibility in the Kondo Insulator System CeNi1-xCoxSn", Physica B, vol. 223&224;, pp. 262, 1996.
  36. A.Tulapurkar, V. V. Krishnamurthy, S. N. Mishra and S. H.Devare, "Quadrupole and magnetic interaction studies at 111Cd in YMn2", Hyperfine Interactions, vol. C1, pp. 100, 1996.
  37. V. P. S. Awana , Ashwin Tulapurkar, S. K. Malik and A. V. Narlikar, "Role of Ca in enhancing the superconductivity of YBa2Cu3O7-y", Physical Review B, vol. 50, 1994.

Conference Papers / Book Chapters

  1. A. A. Tulapurkar and Y. Suzuki, "Contribution of electron-magnon scattering to spin-dependent Seebeck effect in a ferromagnet" in Solid State Communications (special issue on Spin-caloritronics), Dec. 2011.
  2. Y. Suzuki, A. A. Tulapurkar and C. Chappert, "Spin Injection Phenomena and applications" in Nanomagnetism and Spintronics, Elsevier, Dec. 2009.

Address
Ashwin A. Tulapurkar
Qualifications

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

Research Interests

• Spintronics
• Physics of nano-devices
• Spin-current induced magnetization switching
• RF properties of spintronic devices
• Noise
• Thermoelectric effects

Work Experience

• Professor, IIT. Bombay, India, 2015-present
• Associate Professor, IIT. 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 Papers


  1. Debasis Das, Ashwin Tulapurkar, and Bhaskaran Muralidharan, "Scaling Projections on Spin-Transfer Torque Magnetic Tunnel Junctions", IEEE Transactions on Electron Devices, vol. 65, pp. 724-732, Feb. 2018. [DOI]
  2. A. A. Tulapurkar and Y. Suzuki, "Boltzmann approach to dissipation produced by a spin-polarized current", Phys. Rev. B, vol. 83, 2011.
  3. A. A. Tulapurkar and Y. Suzuki, "Contribution of electron-magnon scattering to spin-dependent Seebeck effect in a ferromagnet", Solid State Communications (special issue on Spin-caloritronics), vol. 150, pp. 466, 2010.
  4. T. Maruyama, Y. Shiota, T. Nozaki, K. Ohta, N. Toda, M.Mizuguchi, A. A. Tulapurkar, T. Shinjo, M. Shiraishi, S. Mizukami, Y. Ando, Y. Suzuki, "Large voltage-induced magnetic anisotropy change in a few atomic layers of iron", Nature Nanotechnology, vol. 4, pp. 158-161, Jan. 2009.
  5. Takeshi Seki, Hiroyuki Tomita, Ashwin A. Tulapurkar, Masashi Shiraishi, Teruya Shinjo, and Yoshishige Suzuki, "Spin-transfer-torque-induced ferromagnetic resonance for Fe/Cr/Fe layers with an antiferromagnetic coupling field", Appl. Phys. Lett., vol. 94, 2009.
  6. 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. Stohr, "Direct Observation of Spin-Torque Driven Magnetization Reversal through Nonuniform Modes", Physical Review Letters, vol. 100, 2008.
  7. Yamaguchi, H. Miyajima, T. Ono, Y. Suzuki, S. Yuasa, A. Tulapurkar, and Nakatani, "Rectification of radio frequency current in ferromagnetic nanowire", Applied Physics Letters, vol. 90, 2007.
  8. Suzuki Y, Tulapurkar A, Yagami K, Devolder T, Fukushima A, Kubota H, Yuasa S, Crozat P, Chappert C, "Ultrahigh speed spin-transfer magnetization switching in magnetic multilayers", Japanese Journal of Applied Physics, vol. 45, 2006.
  9. Yagami K, Tulapurkar AA, Fukushima A, Suzuki Y, "Inspection of intrinsic critical currents for spin-transfer magnetization switching", IEEE Transactions on Magnetics, vol. 41, pp. 2615, 2005.
  10. T. Devolder, P. Crozat, C. Chappert, J. Miltat, A. Tulapurkar, Y. Suzuki, K.Yagami, "Instability threshold versus switching threshold in spin-transfer-induced magnetization switching", Physical Review B, vol. 71, 2005.
  11. T. Devolder, C. Chappert, P. Crozat, A. Tulapurkar, Y. Suzuki, J. Miltat, K.Yagami, "Precharging strategy to accelerate spin-transfer switching below the nanosecond", Applied Physics Letters, vol. 86, 2005.
  12. T. Devolder, A. Tulapurkar, Y. Suzuki, C. Chappert, P. Crozat, and K. Yagami, "Temperature study of the spin-transfer switching speed from dc to 100 ps", Journal of Applied Physics, vol. 98, 2005.
  13. K. Yagami, A. A. Tulapurkar, A. Fukushima, and Y. Suzuki, "Estimation of thermal durability and intrinsic critical currents of magnetization switching for spin-transfer based magnetic random access memory", Japanese Journal of Applied Physics, vol. 97, 2005.
  14. Devolder T., Tulapurkar A., Yagami K., Crozat P., Chappert C., Fukushima A., Suzuki Y, "Ultra-fast magnetization reversal in magnetic nano-pillars by spin-polarized current", Journal of Magnetism and Magnetic Materials, vol. 286, 2005.
  15. Akio Fukushima, Kojiro Yagami, Ashwin A. Tulapurkar, Yoshishige Suzuki, Hitoshi Kubota, Atsushi Yamamoto, and Shinji Yuasa, "Peltier Effect in Sub-micron-Size Metallic Junctions", Japanese Journal of Applied Physics, vol. 44 (Part 2), 2005.
  16. A. Tulapurkar, Y. Suzuki, A. Fukushima, H. Kubota, H. Maehara, K. Tsunekawa, D. D. Djayaprawira, N. Watanabe, and S. Yuasa, "Spin-torque diode effect in magnetic tunnel junctions", Nature, 2005.
  17. K. Yagami, A. A. Tulapurkar, A. Fukushima, and Y. Suzuki, "Low-current spin-transfer switching and its thermal durability in a low-saturation-magnetization nanomagnet", Applied Physics Letters, vol. 85, 2004.
  18. A. Tulapurkar, T. Devolder, K. Yagami, P. Crozat, C. Chappert, A.F ukushima, Y. Suzuki, "Subnanosecond magnetization reversal in magnetic nanopillars by spin angular momentum transfer", Applied Physics Letters, vol. 85, 2004.
  19. Kundaliya D.C., Vij R., Kulkarni R.G., Tulapurkar A.A., Pinto R., Malik S.K., Yelon W.B., "Structural, magnetic and magnetotransport properties of the La0.67Ca0.33Mn0.9Fe0.1O3 perovskite", Journal of Magnetism and Magnetic Materials, vol. 264, pp. 62, 2003.
  20. Darshan C. Kundaliya, A. A. Tulapurkar, S. R. Shinde, R. Pinto,W. B. Yelon, R. G. Kulkarni, and S. K. Malik, "Giant magnetoresistance properties of the La1-2xRxAxMnO3 (R=Nd, A=Ca) perovskites", Journal of Applied Physics, vol. 93, 2003.
  21. S.N. Mishra, P. Taneja, P. Ayyub, A. A. Tulapurkar, "Local magnetism of Fe in Ag nanoparticles", Physica B, vol. 312, pp. 162-164, 2002.
  22. Kundaliya DC, Vij R, Tulapurkar AA, Vaidya U, Pinto R, Kulkarni RG, "Temperature hysteretic effect and its influence on colossal magnetoresistance of La0.33Nd0.33Ca0.33MnO3", Pramana-Journal of Physics, vol. 58, 2002.
  23. Kundaliya DC, Tulapurkar AA, John J, Pinto R, Kulkarni RG, "Enhanced temperature-independent magnetoresistance below the metal-insulator transition temperature of epitaxial La0.2Nd0.4Ca0.4MnO3 thin films", Pramana-Journal of Physics, vol. 58, 2002.
  24. Kundaliya D.C., Tulapurkar A.A., Pinto R., Kumar R., Kulkarni R.G., "A comparative study of magnetotransport and magnetization in epitaxial La0.6Nd0.2Ca0.2MnO3 unirradiated and heavy ion irradiated thin films", Solid state Communications, vol. 122, 2002.
  25. D. Pal, S. Sarkar, A. Tulapurkar, S.Ramakrishnan, A. K. Grover, G. Ravikumar, D. Dasgupta, Bimal K. Sarma, C. V. Tomy, G. Balakrishnan, D Mck Paul, "Comparison of the history effects in magnetization in weakly pinned crystals of high Tc and low Tc superconductors", Superconducting Science and Technology, vol. 15, pp. 254-257, 2002.
  26. D. C. Kundaliya, A. A. Tulapurkar, J. John, R. Pinto, R. G. Kulkarni, "Giant magnetoresistance in perovskite-like La0.6Nd0.2Ca0.2MnO3 thin films", Physica B, vol. 312, pp. 745-746, 2002.
  27. A. Tulapurkar, A. K. Grover, S. Ramakrishnan, A. Niazi, A. K. Rastogi, "Peak effect studies in 2H-NbS2", Physica B, vol. 312, pp. 118-119, 2002.
  28. S. Demuynch, S.N. Mishra, A.A. Tulapurkar, S. Cottenier, J.Meersschaut, M. Rots, "Spin fluctuations in Y1-xScxMn2 and Y(M n1-xAlx)2 observed by perturbed-angular correlation spectroscopy", Physica B, vol. 293, 2001.
  29. A.Tulapurkar, D. Heidarian, S. Sarkar, S. Ramakrishnan, A. K. Grover, E.Yamamoto, Y. Haga, M. Hedo, Y. Inada and Y. Onuki, "Elucidation of the stable state vortex state across the peak effect region in CeRu2", Physica C, vol. 355, 2001.
  30. A. Tulapurkar, "Critical current density from magnetization hysteresis data using the critical-state model", Physical Review B, vol. 64, 2001.
  31. A.Tulapurkar, S.N. Mishra, R.G. Pillay, H. Salunke, G. P. Das and S. Cottenier, "Local magnetism of isolated Mo atoms at substitutional and interstitial sites in Yb metal: Experiment and theory", Physical Review Letters, vol. 85, 2000.
  32. A.Tulapurkar and S. N. Mishra, "Magnetic and quadrupole interaction studies at 111Cd in GdMn2 and TbMn2", Hyperfine Interactions, vol. 120/121, pp. 247, 1999.
  33. A. Tulapurkar, S. N. Mishra, E. V. Sampathkumaran, "Local magnetism of Ce in the Kondo lattice compound CeFeGe3", Hyperfine Interactions, vol. 120/121, pp. 199, 1999.
  34. A. Tulapurkar, S. N. Mishra and Z. Hossain, "Local magnetism of Ce in CeNi2B2C: A PAC study", Hyperfine Interactions, vol. 120/121, pp. 225-229, 1999.
  35. V.V. Krishnamurthy, A. A. Tulapurkar, S. N. Mishra, S. K. Malik, D. T. Adroja, B. D. Rainford, "TDPAC Study of Ce Local Susceptibility in the Kondo Insulator System CeNi1-xCoxSn", Physica B, vol. 223&224;, pp. 262, 1996.
  36. A.Tulapurkar, V. V. Krishnamurthy, S. N. Mishra and S. H.Devare, "Quadrupole and magnetic interaction studies at 111Cd in YMn2", Hyperfine Interactions, vol. C1, pp. 100, 1996.
  37. V. P. S. Awana , Ashwin Tulapurkar, S. K. Malik and A. V. Narlikar, "Role of Ca in enhancing the superconductivity of YBa2Cu3O7-y", Physical Review B, vol. 50, 1994.

Conference Papers / Book Chapters

  1. A. A. Tulapurkar and Y. Suzuki, "Contribution of electron-magnon scattering to spin-dependent Seebeck effect in a ferromagnet" in Solid State Communications (special issue on Spin-caloritronics), Dec. 2011.
  2. Y. Suzuki, A. A. Tulapurkar and C. Chappert, "Spin Injection Phenomena and applications" in Nanomagnetism and Spintronics, Elsevier, Dec. 2009.

Address

IIT Bombay was established in the year 1957 and the department of Electrical Engineering (EE) has been one of its major departments since its inception.

Contact Us

IIT Bombay was established in the year 1957 and the department of Electrical Engineering (EE) has been one of its major departments since its inception.

Contact Us

IIT Bombay was established in the year 1957 and the department of Electrical Engineering (EE) has been one of its major departments since its inception.

Contact Us

About | IITBEducation | Research | Site Map | Feedback | RTI | Contact Us

© 2023, IITB. All rights reserved.

About | IITBEducation | Research | Site Map | Feedback | RTI | Contact Us

© , IITB. All rights reserved.

About | IITBEducation | Research | Site Map | Feedback | RTI | Contact Us

© 2023, IITB. All rights reserved.