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Magnetism and Spin Electronics
Dr. M. Venkatesan
department of Physics

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MANSE



venkatemDr. M. Venkatesan
append @tcd.ie

Home: Madras (Chennai), India

Education:
B.Sc. Physics - 1992
Presidency College, University of Madras, India

M.Sc. Physics - 1994
School of Physics, University of Madras, India

Ph.D.
Indian Institute of Technology (IIT) Madras, India
Area of Research : Advanced Magnetic Materials/Permanent Magnets
Title of Thesis : Synthesis, Structure and Magnetic properties of (R1R2)Fe17-xGax { (R1R2) = (Ho,Er), (Tm, Pr), (Nd, Sm) and (Sm, Pr)} compounds and their carbides.


Specialties: Spin Electronics: Magnetic semiconductors, half-metallic ferromagnets, magnetotransport, permanent magnetic materials, soft magnetic materials, interstitially modified intermetallics, Mössbauer spectroscopy, etc.

Projects:
High Temperature Magnets (HITEMAG)
Advanced Magnetic Oxides for Responsive Engineering (AMORE)
MicroElectroMechanical Systems (M2EMS)

Activities/Interests: Wicket-keeping batsman in TCD Cricket team

Venky joined TCD in December 1998 after completing his Ph.D. in Indian Institute of Technology, (I.I.T.) Madras (1994-1998). He is currently working on magnetic semiconductors, novel d0 ferromagnets, half metallic oxides and intermetallics, magnetotransport, hard and soft magnetic materials etc.

Ten significant publications:

  1. Donor impurity-band exchange in dilute ferromagnetic oxides,
    J.M.D. Coey, M. Venkatesan and C.B. Fitzgerald
    Nature Materials 4, 173-6 (2005). (PDF)
  2. Unexpected magnetism in a dielectric oxide,
    M. Venkatesan, C. B. Fitzgerald, J.M.D. Coey
    Nature 430, 630 (2004). (PDF)
  3. Anisotropic ferromagnetism in substituted zinc oxide,
    M. Venkatesan, C.B. Fitzgerald, J.G. Lunney and J.M.D. Coey
    Phys. Rev. Lett., 93, 177206 (2004). (PDF)
  4. Ferromagnetism in Fe-doped SnO2 thin films,
    J.M.D. Coey, A.P. Douvalis, C.B. Fitzgerald and M. Venkatesan
    Appl. Phys. Lett., 84, 1332 (2004). (PDF)
  5. Ferromagnetism of graphite nodules from the Canyon Diablo meteorite
    J.M.D. Coey, M. Venkatesan, C. B. Fitzgerald, A. P. Douvalis and I.S. Sanders
    Nature, 420,156 (2002). (PDF)
  6. Mössbauer spectrometry of A2FeMoO6 (A = Ca, Sr, Ba): Search for antiphase domains.
    J.M. Greneche, M. Venkatesan, R. Suryanarayanan and J.M.D. Coey
    Phys. Rev. B. 63, 17 4403 (2001). (PDF)
  7. 57Fe Mössbauer spectroscopy of HoErFe17-xGaxCy compounds.
    M. Venkatesan, U.V. Varadaraju and K.V.S. Rama Rao
    Phys. Rev. B . 64, 09 4427 (2001). (PDF)
  8. Half-metallic ferromagnetism: The example of CrO2.
    J.M.D. Coey and M. Venkatesan
    J. Appl. Phys., 91, 8345 (2002). (PDF)
  9. Half-metallic oxide point contacts.
    J.M.D. Coey, J. Versluijs and M. Venkatesan
    J. Phys. D: Appl. Phys . 35, 2457 (2002). (PDF)
  10. Magnetism in dilute magnetic oxide thin films based on SnO2.
     C.B. Fitzgerald, M. Venkatesan, L.S. Dorneles, R. Gunning, P. Stamenov, J.M.D. Coey
    Phys. Rev. B. 74, 115307 (2006). (PDF)

 

Publications in Refereed International Journals:

  1. C.B. Fitzgerald, M. Venkatesan, L.S. Dorneles, R. Gunning, P. Stamenov, J.M.D. Coey
    Magnetism in dilute magnetic oxide thin films based on SnO2
    Phys. Rev. B. 74, 115307 (2006).
  2. R.D. Gunning, M. Venkatesan, D.H. Grayson and J.M.D. Coey
    Magnetic properties of CNx whiskers
    Carbon, 44, 3213 (2006).
  3. S. Balakrishnan, Y.K. Gun'ko, T.S. Perova, R.A. Moore, M. Venkatesan, A.P. Douvalis and P. Bourke
    Dendrite-like self-assembly of magnetite nanoparticles on porous silicon
    SMALL 2, 864 (2006).
  4. S. Krishnamurthy, C. McGuinness, L.S. Dorneles, M. Venkatesan, J.M.D. Coey , J.G. Lunney , C.H. Patterson , K.E. Smith , T. Learmonth , P.A. Glans , T. Schmitt and J.H. Guo
    Soft-x-ray spectroscopic investigation of ferromagnetic Co-doped ZnO
    J. Appl. Phys. 99, 08M111 (2006).
  5. P. Stamenov , M. Venkatesan, L.S. Dorneles , D. Maude and Coey JMD
    Magnetoresistance of Co-doped ZnO thin films
    J. Appl. Phys. 99, 08M124 (2006).
  6. C.B. Fitzgerald , M. Venkatesan , A.P. Douvalis and J.M.D. Coey
    Magnetic properties of carbonado diamonds
    J. Magn. Magn. Mater., 300, 368 (2006).
  7. D. O'Mahony , C. Smith , C. Budtz-Jorgensen , M. Venkatesan, J.G. Lunney , J.F. and J.M.D. Coey
    Optical and magnetic properties of europium sulphide thin films grown by pulsed laser deposition
    Thin Solid Films, 488, 200 (2005).
  8. J. M. D. Coey, M. Venkatesan, P. Stamenov, C. B. Fitzgerald and L. S. Dorneles
    Magnetism in hafnium dioxide
    Phys. Rev. B, 72, 024450 (2005).
  9. K. Nakajima , G. Fen , C. Caillol , L.S. Dorneles , M. Venkatesan and J.M.D. Coey
    Tunnel magnetoresistance of disordered, low-moment Co2MnSi Heusler alloy thin films J. Appl. Phys. 97, 10C904 (2005).
  10. L.S. Dorneles , D. O'Mahony, C.B. Fitzgerald , F. McGee , M. Venkatesan , I. Stanca , J.G. Lunney and J.M.D. Coey
    Structural and compositional analysis of transition-metal-doped ZnO and GaNPLD thin films
     Appl. Surf. Sci., 248, 406 (2005).
  11. S. Balakrishnan , Y.K. Gun'ko , T.S. Perova , M. Venkatesan , E.V. Astrova and R.A. Moore Magnetic nanoparticles - porous silicon composite material Physica Status Solidi A-Applications and Materials Science, 202, 1698 (2005).
  12. C.B. Fitzgerald , M. Venkatesan , J.G. Lunney , L.S. Dorneles and J.M.D. Coey
    Cobalt-doped ZnO - a room temperature dilute magnetic semiconductor
    Appl. Surf. Sci. 247, 493 (2005).
  13. J.M.D. Coey, M. Venkatesan, C.B. Fitzgerald, L.S. Dorneles, P. Stamenov, J.G. Lunney
    Anisotropy of the magnetization of a dilute magnetic oxide
    J. Magn. Magn. Mater., 290, 1405 (2005).
  14. J.M.D. Coey, M. Venkatesan and C.B. Fitzgerald Donor impurity-band exchange in dilute ferromagnetic oxides Nature Materials, 4, 173 (2005).
  15. L. S. Dorneles, M. Venkatesan, M. Moliner, J. G. Lunney and J. M. D.
    Coey Ferromagnetism in thin films of CaB6 and SrB6
    Appl. Phys. Lett., 85, 6377 (2004).
  16. D. O'Mahony , F. McGee , M. Venkatesan , J.G. Lunney and J.M.D. Coey
    Room-temperature ferromagnetism in (Ga, Mn)N thin films grown by pulsed laser deposition
     Superlattices and Microstructures, 36, 403 (2004).
  17. B. Vengalis, V. Lisauskas, K. Sliuziene , V. Petrauskas , S. van Dijken , M. Bari , M. Venkatesan and J.M.D. Coey
    Growth and investigation of oxide heterostructures containing half-metallic Fe3O4 Solid State Phenomena, 99, 133 (2004).
  18. M. Venkatesan, C.B. Fitzgerald, J.G. Lunney and J.M.D. Coey
    Anisotropic ferromagnetism in substituted zinc oxide
    Phys. Rev. Lett., 93, 177206 (2004).
  19. M. Venkatesan, C.B. Fitzgerald and J.M.D. Coey
    Unexpected magnetism in dielectric oxide
    Nature, 430, 630 (2004).
  20. J.M.D. Coey, A.P. Douvalis, C.B. Fitzgerald and M. Venkatesan
    Ferromagnetism in Fe-doped SnO2 thin films
    Appl. Phys. Lett ., 84, 1332 (2004).
  21. M. Venkatesan, P. Velasco, J. Alonso, J. L. Martínez and J.M.D. Coey
    Powder magnetoresistance of Tl2Mn2O7 and related compounds
     J. Phys. C: Condens. Matter., 16, 3465-3480 (2004).
  22. E. Clifford, M. Venkatesan, R. Gunning and J.M.D. Coey
    Magnetoresistance in point contacts of the Heusler alloy
    Co2Fe0.6Cr0.4 Al
    Solid State Communications 131, 61 (2004).
  23. S.A.  Corr, Y.K. Gun'ko, A.P. Douvalis, M. Venkatesan and R.D. Gunning
    Magnetite nanocrystals from a single source metallorganic precursor: metallorganic chemistry vs. biogeneric bacteria J. Mater. Chem.
    (Communications), 14, 944 (2004).
  24. C.B. Fitzgerald, M. Venkatesan, A.P. Douvalis, S. Huber, J.M.D. Coey and T. Bakas
    SnO2 doped with Mn, Fe or Co: Room temperature dilute magnetic semiconductors
    J. Appl. Phys., 95, 7390 (2004).
  25. E. Clifford, M. Venkatesan and J.M.D. Coey
    Magnetoresistance in MnBi nanocontacts
    J. Magn. Magn. Mater., 272, 1614 (2004).
  26. M. Venkatesan, J. Buschbeck, F.M.F. Rhen and J.M.D. Coey
    Effect of annealing on magnetic properties of sputtered Nd-Fe-B films
    J. Magn. Magn. Mater ., 272-276, e881 (2004).
  27. M. Venkatesan, S. Nawka, S.C. Pillai and J.M.D. Coey
    Enhanced magnetoresistance in nanocrystalline magnetite
    J. App. Phys ., 93, 8023-8025 (2003).
  28. M. Venkatesan, S. Nawka, S.C. Pillai and J.M.D. Coey
    Enhanced magnetoresistance in nanocrystalline magnetite
    J. App. Phys., 93, 8023 (2003).
  29. F.M.F. Rhen, M. Venkatesan, I.R. Harris and J.M.D. Coey
    Effect of ZrB2 additions on SmCo-1:7 high temperature magnets
    J. App. Phys ., 93, 8683 (2003).
  30. A.P. Douvalis, M. Venkatesan, P. Velasco, C.B. Fitzgerald and J.M.D. Coey
    Combustion synthesis of magnetoresistive double perovskite Ba1.6Sr0.4FeMoO6
    J. App. Phys ., 93, 8071 (2003).
  31. J.M.D. Coey, M. Venkatesan, C. B. Fitzgerald, A. P. Douvalis and I.S. Sanders
    Ferromagnetism of graphite nodules from the Canyon Diablo meteorite
    Nature, 420, 156 (2002).
  32. A.P. Douvalis, M. Venkatesan and J.M.D. Coey
    57Fe Mössbauer studies of Sr2-xCax FeReO6 double perovskite compounds
    Hyperfine Interactions, 144, 267 (2002)
  33. A.P. Douvalis, M. Venkatesan, J.M.D. Coey, M. Grafoute, J.M. Greeneche, R. Suryanarayanan Mössbauer, magnetization and crystal structure studies of the double perovskite Sr2FeMo1-xWxO6
    J. Phys. C: Condens. Matter., 14, 12611 (2002).
  34. J.M.D. Coey, J. Versluijs and M. Venkatesan
    Half-metallic oxide point contacts
    J. Phys. D: Appl. Phys . 35, 2457 (2002).
  35. M. Venkatesan, C.B. Fitzgerald, U.V. Varadaraju and J.M.D. Coey
    Enhanced magnetoresistance in electron doped Sr2FeMoO6
    IEEE Trans. Magnetics, 38, 2919 (2002).
  36. M. Venkatesan, F.M.F. Rhen, R. Gunning and J.M.D. Coey
    Effect of Fe, Cu, Zr and Ti on the magnetic properties of SmCo 1:7 magnets.
    IEEE Trans. Magnetics, 38, 2919 (2002).
  37. M. Venkatesan, U.V. Varadaraju, A.P. Douvalis, C.B. Fitzgerald, F.M.F. Rhen and J.M.D. Coey Enhanced Magnetoresistance in Sr2FeMoO6 by combustion synthesis
    J. Materials Chemistry (Communications) 12, 2184 (2002).
  38. K. Gallagher, A.L'Gouil, M. Venkatesan and J.M.D. Coey
    Structural and magnetic properties of SmZr(CoFe) hard magnets
    IEEE Trans. Magnetics, 38, 2916 (2002).
  39. M. Venkatesan, Chengbao Jiang and J.M.D. Coey
    1:7 alloys produced by mechanical milling
    J. Magn. Magn. Mater ., 242-245, 1350 (2002).
  40. M. Venkatesan, M. Grafoute, A.P. Douvalis, J.-M. Greneche, R. Suryanarayanan and J.M.D. Coey
    Mössbauer studies on Sr2FeMoO6 and related compounds
    J. Magn. Magn. Mater ., 242-245, 744 (2002).
  41. J.M.D. Coey and M. Venkatesan Half-metallic ferromagnetism:The example of CrO2
    J. Appl. Phys ., 91, 8345 (2002).
  42. T.A. Alamelu, U.V. Varadaraju, M. Venkatesan, A.P. Douvalis and JM.D. Coey
    Structural and magnetic properties of Sr2-xCaxFeReO6 compounds
    J. Appl. Phys . 91, 8909 (2002).
  43. K.V.S. Rama Rao, H. Ehrenberg, G. Markandeyulu, U.V. Varadaraju, M. Venkatesan, K.G. Suresh, V.S. Murthy, P.C. Schmidt and H. Fuess
    On the structural and magnetic properties of R2Fe17-x(A,T)x (R = rare earth; A = Al, Si, Ga; T = transition metal) compounds
    Physica Status Solidi A (Applied Research), 189, 373 (2002).
  44. G.B. Biddlecombe, Y.K. Gun'ko, J.M. Kelly, S.C. Pillai, J.M.D. Coey, M. Venkatesan and A.P. Douvalis
    Preparation of magnetic nanoparticles and their assemblies using Fe(II) alkoxide precursor
    J. Materials Chemistry (Communications), 11, 2937 (2001).
  45. A.P. Douvalis, M. Venkatesan and J.M.D. Coey Iron valence in double perovskites . Hyperfine interactions , 5 , 131 (2001).
  46. C.B. Jiang, M. Venkatesan, K.Gallagher and J.M.D. Coey
    Magnetic and structural properties of SmCo7-xTix magnets
    J. Magn. Magn. Mater . 236, 49 (2001).
  47. K. Gallagher, M. Venkatesan and J.M.D. Coey
    Magnetic properties of mechanically-alloyed Sm-Co nanophase hard magnets
    IEEE Trans. Magn., 37, 2528 (2001).
  48. M. Venkatesan, U.V. Varadaraju and K.V.S. Rama Rao
    57Fe Mössbauer spectroscopy of HoErFe17-x2GaxCy compounds
    Phys. Rev. B . 64, 09 4427 (2001).
  49. C. Jiang, M. Venkatesan and J.M.D. Coey
    Transport and magnetic properties of Mn2VAl: Search for half-metallicity
    Solid State Commun . , 118, 513 (2001).
  50. J.M. Greneche, M. Venkatesan, R. Suryanarayanan and J.M.D. Coey
    Mössbauer spectrometry of A2FeMoO6 (A = Ca, Sr, Ba): Search for antiphase domains
    Phys. Rev. B . 63, 17 4403 (2001).
  51. M. Venkatesan, K.V.S. Rama Rao and U.V. Varadaraju
    Magnetic properties of RR'Fe17-xGaxCy [(RR') = (Tm,Pr), (Nd,Sm) & (Sm,Pr)] compounds
     Physica B, 292, 35 (2000).
  52. M. Venkatesan, U.V. Varadaraju and K.V.S. Rama Rao Structural, magnetic and exchange interaction studies on R 2 Fe 17-x Ga x (R = Tm, Er and Sm] compounds Physica B, 291, 159 (2000).
  53. M. Venkatesan, U.V. Varadaraju and K.V.S. Rama Rao
    Magnetic transitions in HoErFe17-xGaxC compounds
    Solid State Commun. , 113, 345 (2000).
  54. M. Venkatesan, U.V. Varadaraju, K.V.S. Rama Rao, H. Luo and W.B. Yelon
    Neutron diffraction studies on (Ho1-xErx)2Fe15Ga2Cy compounds.
    J. Appl. Phys ., 86, 3290 (1999).
  55. M. Venkatesan, U.V. Varadaraju and K. V. S. Rama Rao
    Structural and Magnetic properties of HoErFe17-xGax ( x = 0 - 7) compounds
    J. Magn. Magn. Mater ., 184, 231 (1998).
  56. M. Venkatesan, U.V. Varadaraju, A. Maignan. K.V.S. Rama Rao and B. Raveau
    Observation of magnetic frustration in Dy2Cr2C3 system.
     Solid State Commun ., 105, 169 (1998).
  57. K.V.S. Rama Rao G. Markandeyulu, V.R.Shah, U.V.Varadaraju, M. Venkatesan, Mei-Qui Cheng, K. Sirisha, Mc Henry, V.G. Harris
    Recent developments in 2:17 and 3:29 Permanent magnet materials
    Bull. Mat. Sci ., 22, 509 (1999).
  58. T.S. Sampath Kumar, N.S. Hari, T. Thirumal and M. Venkatesan
    NaNO3 effects on properties of Y and Pb based 1212 ceramic superconductors.
    Trans. Indian Inst. Met . 48, 217 (1995).

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