Name M.S. Ramachandra Rao (Ph.D,IIT, Kharagpur, 1988) Designation Professor Group Phone +91-44-2257 4872 Room MSRC 113 Research Interests Electronic and Magnetic Materials. Thin films and bulk Oxide electronics, Magnetotransport studies in manganites and SPINTRONICS Email msrrao at physics.iitm.ac.in Alternative Email msrrao at iitm.ac.in Personal Home Page http://www.physics.iitm.ac.in/~msrrao

Recent Publications 

• Shubra singh ,E .Senthil Kumar and M .S. Ramachandra Rao
  Microstructural opticaland electrical properties of Cr doped ZnO
  Scripta Materialia58 ,866-869 (2008)


• Shubra Singh ,Bhaskar Reddy ,S.Kotaisamy and M.S. Ramachandra Rao
  Formation of ZnO Nano Brushes in direct atmosphere using carbon catalyst and Zn metal source
  Accepted in Nano (Press)


• K .Moahankant ,K.Sethupathi and M.S. Ramachandra Rao
  Role of oxide barrier in integranular tunnel junctions :An enhanced magnetoresistnace in SiO₂and
  ZnO-coated Fe₃O4 nanopartilces compacts
  J Appl.Phys103,07F318(2008)


• K .Moahankant ,K. Sethupathi and M.S. Ramachandra Rao
  Tuning the magentization dyanmics of silica-coated Fe₃O₄ core-shell nanoparticles by shell thickness control
  J.Appl .Phy103 ,07D5012828574(2008)


• Shubra Singh , N .Rama ,K.Sethupathi and M.S. Ramachandra Rao
  Correlation between elctrical transport .optical and magnetic properties of transition metal ion doped ZnO
  J .Appl. Phys 103,07D108(2008)


• N .Rama ,V .Sankaranaranyanan and M.S. Ramachandra Rao
  Electrical resistivity ,thermoelectric power and electron spin resonance onPr_1-xSr_xMnO₃ (x=0.2,0.26 and 0.3 )
  J.Alloys and Compounds (2007 ,In Press)


• Shubra Singh and M.S.Ramachandra Rao
  Structural and physical properties of undoped and vanadium doped ZnO films
  J.Nanoscience and Nanotchnology (2007 ,inpress).


• Shubra Singh ,P. Thiyagarajan,K. Mohan Kant ,Tirupathiah, B. Tiwari,N. Rama,M.M.K. Samy and M .S .Ramachandra Rao
  Topical Review ,Structural and physical properties of ZnO based materials in various forms: Bulk ,thin film and nano
  J.Phys.D:Applied Physics40,6312-6327(2007)


• Maneesh Chandran ,K. Mohan Kant,N.Rama and M.S.Ramachandra Rao
  PLD Growth of CNTs using a Nanostructured Ni Buffer Layer : Dependence of H2 partial Pressure
  MRS porceedings , 0951-E06-15 (2007).


• P.Thiyagarajan ,M.K. Kottaisamy and M .S. Ramachandra Rao
  Pulsed laser deposited oxide green emitting thin film phosphors:optimization of growth conditions
  Mater.Res.Soc.Symp.Proc.,0988-QQ06-12(2007)


• N.Rama ,J.B .Philipp ,M. Opel ,V. Sankaranarayanan , R. Gross and M . S .Ramachandra Rao
  Effects of substrate on the electrical transport property of Ba₂ FeNbO₆ double perovskite thin films .
  J.Phy. D: Appl.Phys. 40 ,1430 (2007)


• S .Bahskar Reddy ,K. Prasad Rao and M . S. Ramachandra Rao
  Nanocrystalline barium zinconate titanate synthesized at low temperature by an aques co-precipitation technique
  Scripta Materialia 57 ,7 591-594 (2007)


• M .Mangamma ,K. Mohan Kant , M. S. R.Rao, S. Kalavathy ,M.Kamruddin , S.Dash and A.K. Tyagi
  SPM Characterization of pulsed Laser Deposited Nanocrystalline CrN Hard Coatings
  J .Nanosci. Nanotechnology ,7,2176 -2181 (2007)


• S.Bhaskar Reddy ,M.S. Ramachandra Rao and K Prasad Rao
  Obesrvation of high permittivity in Ho substituted BaZr_0.1Ti_0.9O₃ ceramics
  Appl.Phy.Lett.91 ,022917 (2007)


• S .Bhaskar Reddy , M.S. Ramachandra Rao ,K Prasad Rao
  Structural and dielectric characterization of Sr substituted Ba (Zr,Ti)) ₃ based functional materials
  Applied Physics A: Materials Science & Processing , A89 .1011-1015 (2007)


• N. Rama , V .Sankaranarayanan , M.Opel, R.Gross and M. S . Ramachandra Rao.
  Influnece of disorder on the low and high temperature magnetization and magnetoresistance in
  Pr_0.6R_0.1Sr_0.3MnO₃ (R =Tb,Y,Ho and Er ) manganite .
  Journal of Alloys and Compounds , 443 ,7- 10 (2007)


• P.Thiyagarajan,M .Kottaisamy and M.S. Ramachandra Rao
  Structural and luminescence properties of pulsed laser deposited green emitting Zn₂SiO₄:Mn phosphor thin films
  Scripta Materials57(5),433 - 436 (2007)


• P. Thiyagarajan , M. Koattaisamy and M. S. Ramachandra Rao
  Improved luminescent properties of Zn₂SiO₄:Mn green phosophor prepared from a gel combustion synthesized ZnO:Mn-SiO₂
  J . Electrochem. Soc . 154 (4), H297-H303 (2007)


• P.Thiyagarajan, M.Kottaisamy and M. S. Ramachandra Rao
  Luminescent properties of near UV excitable Ba₂ZnS₃:Mn red emitting phosphor blend for white LED and display applications
  Journal of Physics D: Applied Physics – 39,2701 - 2706 (2006).


• P Thiyagarajan ,M .Kottaisamy and M .S.Ramachandra Rao
  Influence of sulphur and charge compenstor on tth luminescent properties of SrS:Ce prepared from SrSO4:Ce(SO4)₂
  Master .Res. Bull 42(4),753-761 (2006)


• Shubra Singh, N. Rama and M. S. Ramachandra Rao
  Influence of d-d transition bands on electrical resistivity in Ni-doped polycrystalline ZnO
  Applied Physics Letters 88, 222111(2006)


• N. Rama, V. Sankaranarayanan and M.S. Ramachandra Rao .
  Role of double exchange interaction on the magnetic and electrical properties of
  Pr_0.8Sr_0.2MnO₃ ferromagnetic insulating manganite.
  J.Appl.Phys 99 08Q315 (2006).
  
  
• N. Rama, K. Mohan Kant, V. Sankaranarayanan and M.S. Ramachandra Rao
  Effect of Ar annealing on the magnetic and transport properties of Pr_0.7Sr_0.3MnO₃.
  J. Magn. Magn. Mater. 302 e342-e346 (2006)
  
  
• S. Bhaskar Reddy, K. Mohan Kant, M. Opel,K. Prasad Rao, R. Gross and M.S.Ramachandra Rao
  Ferroelectric and magnetic property study of Ho₂CuTiO₆ double perovskite.
  J. Magn. Magn. Mater. 303(2),  e332-e334 (2006)
  
  
• M. S. Ramachandra Rao, Darshan C. Kundaliya, S. J. Welz, S. B. Ogale, Abhijit S. Ogale, L. Fu, V. Zaitsev, B. Varughese,
  C. A. Cardoso, A. Curtin, S. Dhar, S. R.Shinde, S. E. Lofland, Steven Schwarz, N. D. Browning, and T. Venkatesan  
  Search for ferromagnetism in undoped and cobalt-doped HfO_2-d  
  Applied Physics Letters 88, 142505 (2006)
  
  
• S. Dhar, M. S. Ramachandra Rao, S. B. Ogale, Darshan C. Kundaliya, S. R. Shinde, and T. Venkatesan S. J. Welz and R. Erni and N. D. Browning 
  Growth of highly oriented HfO₂ thin films of monoclinic phase on yttrium-stabilized ZrO₂ and Si substrates by pulsed-laser deposition 
  Appl Phys Lett 87, 241504 (2005)
  
  
• W. Ramadan, S. B. Ogale, S. Dhar, L. F. Fu, S. R. Shinde, D. C. Kundaliya,
  M. S. R. Rao, N. D. Browning and T. Venkatesan
  Electrical properties of epitaxial junctions between Nb:SrTiO3 and optimally doped,
  underdoped and Zn-doped YBa₂Cu₃O_7-
  Phys.Rev.B 72, 205333 (2005)
  
  
• Imteyaz Ahmad Md, M. Kottaisamy, N. Rama, M.S. Ramachandra Rao and S.S.Battacharya.
  Thin film luminescence of ZnGa2O₄:Mn deposited by PLD.
  Scritpta Materialia 54 237-240 (2006).
  
  
• N. Rama, V. Sankaranarayanan and M.S. Ramchandra Rao
  Study of percolative nature of thermoelectric power and resistivity in
  Pr_0.66R_0.04Sr_0.3MnO₃ (R = Tb, Y, Ho and Er) manganites.
  MRS (Materials Research Society) proc. 848 (2005) FF9.22.1-22.6.
  
  
• P.Thiyagarajan, M.Kottaisamy, K. Sethupathi and M.S.Ramachandra Rao
  Preparation and Luminescence properties of SrS:Ce by addition of sulphur and
  Co-activator in SrSO4:Ce(SO4)2.4H2O by carbothermal reduction
  MRS (Materials Research Society) proc. 829 , (2005) B2.33.1 to 7.
  
  
• M.S.R. Rao, Darshan C. Kundaliya, S. Dhar, Claudio Cardoso, S. Welz,
  S.B. Ogale, S.Lofland, N.D. Browning, and T. Venkatesan.
  Magnetism in Co and Fe-doped HfO₂ thin films for potential spintronic applications,
  MRS (Materials Research Society) proc. 830 (2005) D6.13.1-14 .
  
  
• N.Rama, M.Opel, V.Sankaranarayanan, R Gross, S.B. Ogale, T.Venkatesan and M.S.Ramachandra Rao
  A-site dependent percolative thermopower and Griffiths phase in Pr_(0.7-x)Ho_xSr_0.3MnO₃(x = 0, 0.04, 0.08 and 0.1)
  J.Appl Phys 97 (2005) 10H713- 10H715.
  
  
• K. Mohan Kant, S.B.Ogale, T.Venkatesan, K. Sethupathi and M.S. Ramachandra Rao.
  Magnetic and optical properties of rare earth doped Sn_0.95RE_0.05O_2-(RE=Gd, Dy, Er).
  App. Phys 97 (2005) 10A925-10A927
  
  
• N.Rama, V.Sankaranarayanan and M.S.Ramachandra Rao
  Effect of A-site disorder on the percolative transport properties of Pr_{(0.7- y)}HoySr_0.3MnO₃ (y = 0, 0.04, 0.08 and 0.1)
  J.Magn Magn Mater 292 (2005) 468-475
  
  
• N. Rama, V. Sankaranarayanan, P.Majewski, S.Gepraegs, M. Opel, R. Gross and M.S. Ramachandra Rao
  A-site disorder dependent percolative transport and Griffiths phase in doped manganites.
  Phys Rev B 70 (2004) 224424/ 1-5 .
  
  
• N. Rama, J.B. Philipp, M Opel, A.Erb, V. Sankaranarayanan, R. Gross and M.S. Ramachandra Rao.
  Effect of rare earth ion substitution on the magnetic and
  transport properties of Pr_0.7RE_0.04Sr_0.26MnO₃ (RE= Er, Tb and Ho).
  Eur Phys J.B 38 (2004). 553-557
  
  
• N.Rama, J.B.Philipp, M.Opel, K. Chandrasekaran,
  V.Sankaranarayanan, R.Gross and M.S.Ramachandra Rao
  Study of Magnetic properties of A₂B'NbO₆, Sr, (BaSr); and B'= Fe and Mn) double perovskites.
  J App Phys 95 ,(2004) 7528-7530
  
  
• V. Ravindranath, R. Suryanarayanan, G. Rangarajan and M.S. Ramachanda Rao.
  Evidence for phase separation in Er3+ doped La_0.8Sr_0.2MnO₃.
  Appl. Phys. Lett . 82 (2003 )2865-2867.
  
  
• M.S. Ramachandra Rao, V. Ravindranath and R. Gross..
  Evidence for reduction in spin disorder by Ho³⁺ doping in La_0.7Ca_0.3MnO₃.
  Phil.Mag. 83 (2003 )1631-1637.
  
  
• V. Ravindranath, Abhijat Goel, C.V. Gokularathnam and M.S. Ramachandra Rao.
  Effect of addition of 5wt% PbO on the microstructure
  and electrical transport of La0.7Ca0.3MnO3.
  Tran. Indian Inst.Metals. 56 (2003) 347-350
  
  

Conferences :

• K. Mohan Kant, N. Rama, K. Sethupathi and M. S.Ramachandra Rao  
  Magnetization studies on 4f studies on 4f elements doped Sn_0.95RE_0.05O₂ (RE = Gd, Dy, Er) magnetic semiconductor. 
  50th Golden Jubilee DAE Solid State Physics Symposium held in Mumbai during Dec. 5-9, 2005.
 

• N. Rama, V. Sankaranarayanan and M.S. Ramachandra Rao 
  Electron Spin Resonance Studies on Pr_1-xSr_xMnO₃ (x = 0.2, 0.26 and 0.3) 
  50th Golden Jubilee DAE Solid State Physics Symposium held in Mumbai during Dec. 5-9, 2005.
  
  
• Shubra Singh, N Rama and M.S.Ramachandra Rao  
  Physical properties of doped ZnO thin films grown by Pulsed Laser Deposition 
  DAE BARNS 3^rd National Symposium on Pulsed Laser Deposition of the thin films and nanostructured materials held at Tirupathi, Nov 7-8^th, 2005
 

• K. Mohan Kant, K. Sethupathi and M.S.Ramachandra Rao  
  PLD grown nanostructured n-Carbon/p-Si thin film interfaces. 
  DAE BARNS 3^rd National Symposium on Pulsed Laser Deposition of the thin films and nanostructured materials held at Tirupathi, Nov 7-8^th, 2005. 
  
  
• M.Kottiasamy, P.Thiyagarajan and M.S.Ramachandra Rao. 
  Pulsed laser deposited Y₃Al₅O₁₂ :Ce phosphor thin films for blue light converted white light emitting diodes 
  DAE BARNS 3^rd National Symposium on Pulsed Laser Deposition of the thin films and nanostructured materials held at Tirupathi, Nov 7-8^th, 2005.
 

• P.Thiyagarajan, M.Kottiasamy and M.S.Ramachandra Rao.  
  Pulsed laser deposited Ca₃MgSi₂O₈:Ce phosphor thin films for near UV LED converted blue light emission 
  DAE BARNS 3^rd National Symposium on Pulsed Laser Deposition of the thin films and nanostructured materials held at Tirupathi, Nov 7-8^th, 2005
 

• Shubra Singh, N. Rama and M.S. Ramachandra Rao 
  Electrical and magnetic properties of Zn_1-xDy_xO 
  International conference on Electronic and Photonic Materials, Devices and Systems-2006 held at Kolkata Jan 4-6^th, 2006
 

• P.Thiyagarajan M.M.K.Samy and M.S.R.Rao  
  Synthesis and luminescence properties of Ca₃MgSi₂O₈: Eu phosphor for near UV LED converted green light emission 
  International Conference on Optoelectronic Materials and Thin films for Advanced Technology, OMTAT-2005 held at Kochi, Kerala, India during October 24-27, 2005.
 

• N.Rama , V.Sankaranarayanan and M.S.Ramachandra Rao  
  Role of double exchange interaction on the magnetic and electrical properties of Pr_0.8Sr_0.2MnO₃ ferromagnetic insulating manganite 3MnO₃.  
  50th Annual conference on magnetism and Magnetic Materials held at San Jose California USA.
 

• K. Mohan Kant, N. Rama, K. Sethupathi, M.S.Ramachandra Rao  
  Morphological and magnetic studies of CoFe₂O₄ thin films grown by Pulsed laser deposition.  
  International Symposium of Physics of Magnetic Materials (ISPMM 2005) held in Singapore during September 14-16 2005.
 

• S. Bhaskar Reddy, K. Mohan Kant, M. Opel, K. Prasad Rao, R. Gross and M.S.Ramachandra Rao  
  Ferroelectric and magnetic property study of Ho2CuTiO6 double pervoskite.  
  International Symposium of Physics of Magnetic materials (ISPMM 2005) held in Singapore during September 14-16 2005.
 

• N.Rama, K. Mohan Kant, V.Sankaranarayanan and M.S.Ramachandra Rao.  
  Effect of Ar annealing on the magnetic and transport properties of Pr_0.7Sr_0.3MnO₃.  
  International Symposium of Physics of Magnetic materials (ISPMM 2005) held in Singapore during September 14-16 2005.
 

• D.C. Kundaliya, S.B. Ogale, S.R. Shinde, M.S.R. Rao, T. Venkatesan and S.E. Lofland.  
  Metastable defect ferromagnetic phases by low temperature interface reactions between transition metal oxides.  
  American Physical Society (APS) meeting, March 21-25, 2005, Los Angeles, CA, USA.
 

• M.S.R. Rao, C.A. Cardoso, D.C. Kundaliya, S.E. Lofland, S.B. Ogale and T. Venkatesan.  
  Room temperature ferromagnetism in thin films of high-k dielectric - HfO₂:Co/Fe. 
  American Physical Society (APS) meeting, March 21-25, 2005, Los Angeles, CA, USA.
 

• W. Ramadan, S.B. Ogale, S. Dhar, S.R. Shinde, M.S.R. Rao and T. Venkatesan.  
  Electrical Properties of epitaxial junctions between Nb:SrTiO₃ and optimally doped. Underdoped and Zn-doped YBa2Cu3O7. 
  American Physical Society (APS) meeting, March 21-25, 2005, Los Angeles, CA, USA.  
  
• Md.ImteyazAhmed, M.Kottaisami, M.S.Ramachandra Rao and S.S.Bhattacharya  
  Effect of deposition parameters on ZnGa₂O₄:Mn phosphor grown by PLD  
  International Symposium of Research Scholars (ISRS200) held in IIT-Madras in December 2004
 

• P.Thiyagarajan, M.Kottaisamy, K. Sethupathi and M.S.Ramachandra Rao  
  Effect of codopants on colour tuning of ZnS:Mn phosphors  
  International Symposium of Research Scholars (ISRS 2004) held in IIT-Madras in December 2004
 

• K. Mohan Kant, K. Sethupathi and M.S.Ramachandra Rao.  
  Magnetic properties of 4f element doped SnO₂ 
  International Symposium of Research Scholars (ISRS2004) held in IIT-Madras in December 2004.
 

• N. Rama, J.B. Philipp, M. Opel, V. Sankaranarayanan, R. Gross and M.S. Ramachandra Rao  
  Influence of A-site disorder on the magnetoresistance in Pr_0.74Sr_0.26MnO₃ and Pr_0.7Ho_0.04Sr_0.26MnO₃ manganites 
  International symposium of research Scholars on materials Science and engineering (ISRS 2004) 
  held in IIT-Madras from December 20-22 2004  
  Won the best poster award for technical content in the Magnetism Session.
 

• P.Thiyagarajan, M.Kottaisamy, K. Sethupathi and M.S.Ramachandra Rao.  
  A new red phosphor Ba doped ZnS:Mn for electroluminiscent display devices. 
  Photonics 2004 held in December 2004 at Cochin, India
 

• Dhar, M. S. R. Rao, D. C. Kundaliya, S. B. Ogale, S. E. Lofland, S. R. Shinde and T. Venkatesan. 
  Correlation between oxygen content and high magnetic moment in Co doped HfO₂. S.  
  MRS fall meeting held in Nov. 29-Dec.3, 2004 in Boston, USA.
 

• M.S.R. Rao, Darshan C. Kundaliya, S. Dhar, Claudio Cardoso, S. Welz, S.B. Ogale, S. Lofland, N.D. Browning, and T. Venkatesan  
  Magnetism in Co and Fe-doped HfO2 thin films: For potential spintronic applications. 
  MRS fall meeting held in Nov. 29-Dec.3, 2004 in Boston, USA.
 

• N. Rama, V. Sankaranarayanan and M.S. Ramachandra Rao  
  Study of the percolative nature of thermoelectric power and resistivity in Pr_0.66R_0.04Sr_0.3MnO₃ (R = Tb, Y, Ho and Er ) manganites. 
  MRS fall meeting held in November-December in Boston, USA
 

• P.Thiyagarajan, M.Kottaisamy, K. Sethupathi and M.S.Ramachandra Rao  
  Preparation and Luminiscence properties of SrS:Ce by addition of sulphur 
  and co-activator in SrSO₄:Ce(SO₄)₂.4H₂O by carbothermal reduction 
  MRS fall meeting held in Nov. 29-Dec.3, 2004 in Boston, USA.
 

• J. Sarala Shanthi, K. Sethupathi and M.S.R. Rao  
  Effect of transition metal ion doping on the optical and  
  magnetic properties of Ce_1-xT_xO₂ (T = Fe, Mn, Cr and x = 0.04 and 0.05) 
  49th MMM conference held in November 2004 in Jacksonville, Florida USA
 

• K. Mohan Kant, K. Chandrasekaran, S.B.Ogale, T.Venkatesan, K. Sethupathi and M.S. Ramachandra Rao 
  Magnetic and optical properties of rare earth doped Sn_0.95RE_0.05O_2-δ(RE=Gd, Dy, Er)  
  49th MMM conference held in November 2004 in Jacksonville, Florida USA
 

• N.Rama, M.Opel, V.Sankaranarayanan, R.Gross, S. Ogale, T.Venkatesan and M.S.Ramachandra Rao  
  A-site dependent percolative thermopower and Griffiths phase in Pr_(0.7-x)Ho_xSr_0.3MnO₃ (x = 0, 0.04, 0.08 and 0.1) 
  9^th Annual conference on magnetism and magnetic materials held in Jacksonville Florida from November 7^th to 11^th 2004
 

• M.S.R. Rao, D. Kundaliya, S. R. Shinde, S. Dhar, SaschaWelch, N. D. Browning, 
  S.E. Lofland, R.L. Green, S.B. Ogale and T. Venkatesan 
  Ferromagnetism in 4f-element doped SnO2 Diluted Magnetic Semiconductor system. 
  9^th Annual conference on magnetism and magnetic materials held in Jacksonville Florida from November 7^th to 11^th 2004
 

• N.Rama, V.Sankaranarayanan and M.S.Ramachandra Rao  
  Effect of A site disorder on the magnetism and transport of Pr_0.7-yHo_ySr_0.3MnO₃ (y= 0.04, 0.08 and 0.1)  
  Third international conference on Physics and applications of spin related phenomena in semiconductors held in Santa Barbara, USA on 23rd July 2004
 

• N.Rama, J.B.Philipp, M.Opel, K.Chandrasekaran,V.Sankaranarayanan, R.Gross and M.S.Ramachandra Rao 
  Study of Magnetic properties of A₂B'NbOÂ6 (A=Ba, Sr, (BaSr); and B'= Fe and Mn) double perovskites 
  9th Joint MMM/Intermag conference held on 9th Jan 2004 in Anaheim California.
 

• S. Bhaskar Reddy, V. Ravindranath, M.S. Sivakumar, K. Prasad Rao, K.N. Bhat and M.S. Ramachandra Rao.  
  Study of the ferroelectric properties of PLD grown PLZT thin films for pressure sensor applications. 
  Twelfth International workshop on the Physics of Semiconductor Devices (IWPSD) 
  held during December 16- 20, 2003 at IIT Madras.
 

• N. Rama, V. Ravindranath and M.S. Ramachandra Rao.  
  Tuning of room temperature magnetoresistance using La_0.7Sr_0.3MnO₃/La_0.66Y_0.14Ca_0.3MnO₃/La_0.7Sr_0.3MnO₃ manganite trilayer tunnel junctions. 
  Twelfth International workshop on the Physics of Semiconductor Devices (IWPSD) 
  held during December 16- 20, 2003 at IIT Madras.
 

• Anup Kumar Jha, N. Rama, K. Chandrasekaran, V. Ravindranath and M.S. Ramachandra Rao.  
  Electrical transport and surface morphology studies of PLD grown vanadium dioxide thin films.  
  Twelfth International workshop on the Physics of Semiconductor Devices (IWPSD) 
  held during December 16- 20, 2003 at IIT Madras.