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

I am looking for a good Ph.D. student who is interested in working in the area of nano-scale thermoelectric effects (including spin-dependent thermoelectric effects.)

* Spintronics * Physics of nano-devices * Spin-current induced magnetization switching * RF properties of spintronic devices * Noise *thermoelectric effects (looking for a good Ph.D. student in this area)

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

* Associate Professor, Indian Institute of Technology, Bombay, India, 2009-Present. * 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

A. SPIN-POLARIZED TRANSPORT AND RELATED PHENOMENA

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

* Contribution of electron-magnon scattering to spin-dependent Seebeck effect in a ferromagnet A. A. Tulapurkar and Y. Suzuki,Solid State Communications (special issue on Spin-caloritronics),150, 466 (2010)

* Spin-transfer-torque-induced ferromagnetic resonance for Fe/Cr/Fe 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)

* Large voltage-induced magnetic anisotropy change in a few atomic layers of iron- 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 , Nature Nanotechnology 4, 158-161 (18 Jan 2009)

* 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. Stohr, Physical Review Letters, 100, 247201 (2008)

* 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)

* 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)

* 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)

* 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) * 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)

* 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)

* 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)

* 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)

* 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)

* 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)

* 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)

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

B. CORRELATED MATERIALS : SUPERCONDUCTIVITY AND COLOSSAL MAGNETORESISTANCE

* Structural, magnetic and magnetotransport properties of the La0.67Ca0.33Mn0.9Fe0.1O3 perovskite Kundaliya D.C., Vij R., Kulkarni R.G., Tulapurkar A.A., Pinto R., Malik S.K., Yelon W.B., Journal of Magnetism and Magnetic Materials, 264, 62 (2003)

* Giant magnetoresistance properties of the La1-2xRxAxMnO3 (R=Nd, A=Ca) perovskites Darshan C. Kundaliya, A. A. Tulapurkar, S. R. Shinde, R. Pinto,W. B. Yelon, R. G. Kulkarni, and S. K. Malik, Journal of Applied Physics, 93, 8086 (2003)

* Comparison of the history effects in magnetization in weakly pinned crystals of high Tc and low Tc superconductors 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 , Superconducting Science and Technology, 15, 254-257 (2002)

* Peak effect studies in 2H-NbS2, A. Tulapurkar, A. K. Grover, S. Ramakrishnan, A. Niazi, A. K. Rastogi, Physica B, 312, 118-119 (2002)

* Temperature hysteretic effect and its influence on colossal magnetoresistance of La0.33Nd0.33Ca0.33MnO3 Kundaliya DC, Vij R, Tulapurkar AA, Vaidya U, Pinto R, Kulkarni RG, Pramana-Journal of Physics, 58, 1041 (2002)

* Enhanced temperature-independent magnetoresistance below the metal-insulator transition temperature of epitaxial La0.2Nd0.4Ca0.4MnO3 thin films ,Kundaliya DC, Tulapurkar AA, John J, Pinto R, Kulkarni RG, Pramana-Journal of Physics, 58, 1089 (2002)

* A comparative study of magnetotransport and magnetization in epitaxial La0.6Nd0.2Ca0.2MnO3 unirradiated and heavy ion irradiated thin films, Kundaliya D.C., Tulapurkar A.A., Pinto R., Kumar R., Kulkarni R.G., Solid state Communications, 122 , 419(2002)

* Giant magnetoresistance in perovskite-like La0.6Nd0.2Ca0.2MnO3 thin films ,D. C. Kundaliya, A. A. Tulapurkar, J. John, R. Pinto, R. G. Kulkarni, Physica B, 312, 745-746 (2002)

* Elucidation of the stable state vortex state across the peak effect region in CeRu2 , A.Tulapurkar, D. Heidarian, S. Sarkar, S. Ramakrishnan, A. K. Grover, E.Yamamoto, Y. Haga, M. Hedo, Y. Inada and Y. Onuki, Physica C 355, 59 (2001).

* Critical current density from magnetization hysteresis data using the critical-state model, A. Tulapurkar ,Physical Review B 64, 014508, (2001).

* Role of Ca in enhancing the superconductivity of YBa2Cu3O7-y , V. P. S. Awana , Ashwin Tulapurkar, S. K. Malik and A. V. Narlikar, Physical Review B 50, 594 (1994).

C. LOCAL MAGNETISM WITH HYPERFINE FIELD MEASUREMENTS

* Local magnetism of Fe in Ag nanoparticles, S.N. Mishra, P. Taneja, P. Ayyub, A. A. Tulapurkar, Physica B, 312,162-164 (2002)

* Spin fluctuations in Y1-xScxMn2 and Y(M n1-xAlx)2 observed by perturbed-angular correlation spectroscopy , S. Demuynch, S.N. Mishra, A.A. Tulapurkar, S. Cottenier, J.Meersschaut, M. Rots, Physica B 293, 376, (2001).

* Local magnetism of isolated Mo atoms at substitutional and interstitial sites in Yb metal: Experiment and theory ,A.Tulapurkar, S.N. Mishra, R.G. Pillay, H. Salunke, G. P. Das and S. Cottenier, Physical Review Letters, 85, 1978 (2000).

* Local magnetism of Ce in CeNi2B2C: A PAC study , A. Tulapurkar, S. N. Mishra and Z. Hossain, Hyperfine Interactions, 120/121, 225 (1999).

* Local magnetism of Ce in the Kondo lattice compound CeFeGe3 , A. Tulapurkar, S. N. Mishra, E. V. Sampathkumaran, Hyperfine Interactions, 120/121, 199 (1999).

* Magnetic and quadrupole interaction studies at 111Cd in GdMn2 and TbMn2, A.Tulapurkar and S. N. Mishra, Hyperfine Interactions,120/121, 247, (1999).

* Quadrupole and magnetic interaction studies at 111Cd in YMn2, A.Tulapurkar, V. V. Krishnamurthy, S. N. Mishra and S. H.Devare, Hyperfine Interactions, C 1, 100 (1996).

* TDPAC Study of Ce Local Susceptibility in the Kondo Insulator System CeNi1-xCoxSn, V.V. Krishnamurthy, A. A. Tulapurkar, S. N. Mishra, S. K. Malik, D. T. Adroja, B. D. Rainford, Physica B 223&224, 262 (1996).

* “Spin Injection Phenomena and applications” by Y. Suzuki, A. A. Tulapurkar and C. Chappert in “Nanomagnetism and Spintronics” edited by T. Shinjo (Elsevier 2009).