Contact Address

Dr. Suryanarayana Jammalamadaka
Associate Professor
Department of Physics
Indian Institute of Technology Hyderabad
Ordinance Factory
Yeddumailaram, Hyderabad - 502205
India
Phone: 040 - 2301 7085
Email: surya@iith.ac.in; jsurya.iit@gmail.com

Education:

Master of Science: University of Hyderabad (2002)
Doctor of Philosophy (PhD) : Indian Institute of Technology Madras (2008)
Postdoctoral experience

Sept 2007 - Dec 2008 Visiting Fellow, Tata Institute of Fundamental Research, Mumbai
Jan 2009 - Jan 2010 Research Fellow, National University of Singapore, Singapore
June 2010 - June 2012, Methusalem Postdoctoral Research fellow, Katholic University of Leuven, Belgium

 
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Understanding the physics behind various nanoscopic, mesoscopic and bulk magnetic materials and realization of their usage in practical devices such spin-electronics, opto-electronics, semiconducting devices, nano-electronics, ultrasonics and bioscience is one of the aims  of my present research. Fundamentally, novel properties emerge in magnetic elements as the material dimensions become comparable to or smaller than certain characteristic length scales, such as spin diffusion length, carrier mean free path, magnetic exchange length, domain wall width, etc. When the size of magnetic  material reduces, the magnetic properties of them would alter based on their dimensions.  Such a strong dependence on the geometry allows one then to tailor the magnetization configuration by appropriately engineering the geometry. In addition, under extreme conditions such as very low temperatures, high magnetic fields and high pressures, one can realize quantum effects. Under these extreme and normal conditions understanding the structural, magnetic, electrical and optical properties are of great interest.

Dr. J. Suryanarayana
Magnetic Materials and Device Physics Laboratory
Department of Physics
Indian Institute of Technology Hyderabad
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Recent Publications




Full publication list
Selected publications

15. Spin - orbit coupling and Lorentz force enhanced efficiency of TiO2 based dye sensitized solar cells
      Physica status solidi A1600691 (2017)  (With U. M. Kannan)

14. Magnetostrictive Fe73Ga27 nanocontacts for low-field conductance switching
      Appl. Phys. Lett. 108, 242408 (2016) (With U. M. Kannan)

13. Band gap tuning and orbital mediated electron - phonon coupling in HoFe1-xCrxO3
     J. Appl. Phys. 118, 124101 (2015) (With Ganesh Kotnana)
     
12. Remote control of magnetostriction-based nanocontacts at room temperature
      S. Narayana Jammalamadaka, S. Kuntz, Oliver Berg, W. Kittler, U. M. Kannan, J. Arout Chelvane, and Christoph Surgers
      Scientific Reports 5, 13621 (2015)

11. Spin reversal in Fe8 under fast pulsed magnetic fields
      S. Narayana Jammalamadaka, S VÚlez, J Vanacken, V V Moshchalkov, L Chibotaru, J Tejada and F MaciÓ
      New Journal of Physics 17, 073006 (2015)

10. Resistive switching in ultra-thin La0.7Sr0.3MnO3/SrRuO3 superlattices
      S. Narayana Jammalamadaka, J. Vanacken and V. V. Moshchalkov
      Appl. Phys. Lett., 105, 033505 (2014)

09. Dynamic response of exchange bias in graphene nanoribbons
      S. Narayana Jammalamdaka, SRINIVASA SINGAMANENI RAO , Johan Vanacken, Victor V. Moshchalkov ,
      Wei Lu , James M. Tour
      Appl. Phys. Lett 101, 142402 (2012)

08. Ferromagnetism in Graphene Nanoribbons: Split versus Oxidative Unzipped Ribbons
      S. S. Rao*, S. Narayana Jammalamadaka*, A. Stesmans, and V. V. Moshchalkov ,
      J. van Tol , D. V. Kosynkin, A. Higginbotham-Duque, and J. M. Tour
      Nano Lett. 12, 1210 (2012) (*equal contribution)

07. Exchange bias and training effects in antiferromagnetically coupled La0.7Sr0.3MnO3/SrRuO3
      superlattices
      S. Narayana Jammalamadaka, J. Vanacken and V. V. Moshchalkov
      Europhysics Letters 98 17002 (2012)

06. S. Narayana Jammalamadaka, G. Markandeyulu and Krishnan Balasubramaniam
      Magnetostriction and anisotropy compensation in TbxDy0.9-xNd0.1Fe1.93 [0.2 ? x ? 0.4]
      Appl. Phys. Lett. 97, 242502 (2010)

05. S. Narayana Jammalamadaka, Niharika Mohapatra, Karthik K. Iyer and E. V. Sampathkumaran
      Enhancement of positive magnetoresistance following a magnetic-field-induced ferromagnetic  transition in the
      intermetallic compoundTb5Si3
      Phys. Rev. B Rapid communications 79, 060403 (2009)

04. Sitikantha D. Das, S. Narayana Jammalamadaka and E. V. Sampathkumaran
      Magnetic ordering in the fine particles of some bulk Pauli-paramgnets
      Phys. Rev. B 80, 024401 (2009)

03. S. Narayana Jammalamadaka, E. V. Sampathkumaran, V. Satya Narayana Murthy and G. Markandeyulu
      Room temperature soft ferromagnetism in the nanocrystalline form of YCo2 - a well-known bulk Pauli paramagnet
      Appl. Phys. Lett. 92, 192506 (2008)

02. S.Narayana Jammalamadaka, G.Markandeyulu, Elankumarn Kannan and Krishnan Balasubramaniam
      Development of 100 kHz high power ultrasonic magnetostrictive transducer for Non-Destructive Testing.
      Appl. Phys. Lett. 92, 044102 (2008)

01. Niharika Mohapatra, S. Narayana Jammalamadaka, Sitikantha D. Das and E.V. Sampathkumaran
      Magnetic anomalies in Nd6Co1.67Si3: Surprising first order transitions in the low-temperature isothermal magnetization (2008)
      Phys. Rev. B 78, 054442 (2008)

















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