School of Physics

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Trinity College Dublin
Dublin 2
Ireland

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physics@tcd.ie Gaeilge

Dr. M. Venkatesan

Portrait of Dr. M. Venkatesan

Email: venkatem(at)tcd.ie
Phone: +353 1896 2171

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.

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.

Research and Publications

ZEMS (Zero-moment spin electronics) SFI (2018 -2021)

The overarching aim of ZEMS is to develop new spintronic materials that will advance communication rates from GHz to THz, and demonstrates the functionality required for generating terrahertz radiation electrically in ambient conditions. The research is based on a new class of magnetic materials, the zero-moment half metals (ZHMs), which we have pioneered. The oriented basic research in ZEMS can potentially have a serious impact on the business of these companies in the medium/long term. The impact of ZEMS will shift from the academic to the industrial beneficiaries, and then to the public domain. The development of a compact materials system for generating and detecting electromagnetic radiation in the proposed frequency range, based on the ZMHM thrust of ZEMS has the potential to revolutionize areas as different as information and telecommunication technology, safety and security screening as well as monitoring of air quality and pollution.

ROMEO (Replacement and Original Magnet Engineering Options)

In accordance with EU objectives to remove, or greatly reduce, the need for heavy rare earths in permanent magnets, ROMEO will first research and develop several novel microstructural-engineering strategies that will dramatically improve the properties of magnets based purely on light rare earths elements, especially the coercivity, which will enable them to be used for applications above 100°C. ROMEO's second ambitious goal is to develop a totally rare-earth-free magnet; aiming to drastically reduce Europe's dependence on Chinese imports while shifting emphasis in magnet manufacturing from a raw-materials-dependent business to one that is essentially knowledge-based, and flourishing in Europe. The ROMEO consortium assembles the best European academic expertise in permanent magnetism together with world-leading magnet manufacturers and European companies who are eager to exploit these newly developed materials, especially within the "green energy" sector, while associates in the USA and Japan bring special expertise and global reach to the ROMEO consortium.

NISE (Nanoscale Interfaces and Spin Electronics)

The basic question underlying the research proposed in NISE is 'How do interfaces influence spin currents, and how can they be controlled by interface engineering? The name coined for this subfield is 'spinterface science'. We aim to understand and control spin transport and scattering at interfaces involving metals, oxides and organic materials. The basic premise is that interfaces are critical to the control of magnetic behaviour. A specific working hypothesis, relating to d0 magnetism, is that the grain boundary interfaces are the seat of high-temperature Stoner-like ferromagnetism. Devices with novel and optimized interfaces will be developed, including magnetic sensors that can be applied to problems such as contactless imaging of neural activity.

MANSE (MAgnetic Nanostructures and Spin Electronics)

A four-year platform research program in nanoscale magnetism and spin electronics (MANSE) is proposed, following the establishment of a suitable skills and equipment base during the successful CINSE program (2001-2006). MANSE involves materials development, device conception and evaluation, and interdisciplinary initiatives associating nanoscale magnetism with electrochemistry and cell biology.

CINSE (Conception and Implementation of Nanoscale Spin Electronics)

A major program on Spin Electronics, CINSE is focused on spin polarised electron transport in magnetic nanostructures. CINSE covers investment in a new nanoscience facility, support for staff students and a wide ranging scientific program.

M2EMS Magnetic Micro Electro Mechanical Systems)

The aim of this project is the development of new permanent magnet film based devices which could be used in micro-motors, micro-generators, sensors and read heads and help to significantly reduce the size, weight, and cost of these devices. The proposal focuses first on the development of nanostructured magnetic materials with low temperature processes compatible with microelectronics environment.

AMORE (Advanced Magnetic Oxides for Responsive Engineering)

AMORE will develop a new generation of ferromagnetic half-metallic oxides and demonstrate their potential in patented nanoscale magneto resistance. The key idea is to exploit the high degree of spin polarisation of these chemically stable oxides to achieve large magneto resistive effects in the practical temperature range up to 120�C. For this, an understanding of spin transport at grain boundaries and interfaces in these materials is required. Having selected the most suitable of the new double perovskite oxides, the aim is to evaluate the technical and economic feasibility of magneto-resistive elements fabricated from them by two routes

  1. Screen printing - low-cost technique suitable for making contact-less ^potentiometers for the auto industry among others, and
  2. Epitaxial thin-film growth for planar tunnel junctions suitable as magneto electronic elements.

A new generic materials technology for sensitive, robust, low-cost components will be launched, which will boost European competitiveity in a fast-changing field.

HITEMAG (High Temperature MAGnets)

The aim of this project is the development of new magnetic materials and prototype devices for high temperature applications i.e. up to 450�C working temperature. New standards and measurement protocols will also be developed and defined for high temperature permanent magnets. The discovery of high -performance NdFeB magnets in 1983 has led to an extraordinary development of permanent magnet applications. The annual global production of these materials is presently over 10000 tones. The properties of these materials however rapidly degrade as temperature is increased and they cannot be used above 150�C-180�C. From these temperatures and up to 300�C, the Sm(Co,Cu, Fe, Zr) magnets are preferred to the NdFeb. Above this temperature, no material is available although important potential applications exist in the fields of aeronautics, the space (satellite) industry, electronics, and the automotive (petrol and electric) industry.

At a Glance

  1. S Sanvito, C Oses, J Xue, A Tiwari, M Zic, T Archer, P Tozman, M. Venkatesan et al
    Accelerated discovery of new magnets in the Heusler alloy family
    Science Advances 3 (4)(2017),e1602241.
  2. J.M.D. Coey, K. Ackland, M. Venkatesan and S. Sen
    Collective magnetic response of CeO2 nanoparticles
    Nature Physics 12 (2016) 694.
  3. W. Lu, S. Saha, R. Wang� M. Venkatesan et al Coey
    Long-range magnetic coupling across a polar insulating layer
    Nature Communications 7 (2016) 11015.
  4. P. Tozman, M. Venkatesan, G.A. Zickler, J. Fidler and J.M.D. Coey
    Enhanced energy product in Y-Co-Fe magnets intermediate between Nd-Fe-B and ferrite
    Appl. Phys. Lett. 107 (2015) 032405.
  5. H. Kurt, K. Rode, P. Stamenov, M. Venkatesan et al
    Cubic Mn2Ga Thin films: Crossing the spin gap with ruthenium
    Phys. Rev. Lett., 112 (2014) 027201.
  6. H. Kurt, K. Rode, M. Venkatesan, P. Stamenov and J.M.D. Coey
    High spin polarization in epitaxial films of ferromagnetic Mn3Ga
    Phys. Rev. B. 83, 020405 (2011).
  7. H. Kurt, K. Rode, H. Tokuc, P. Stamenov, M. Venkatesan, and J.M.D. Coey
    Exchange-biased magnetic tunnel junctions with antiferromagnetic Mn3Ga
    Appl. Phys. Lett. 101 232402 (2012).
  8. 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).
  9. J.M.D. Coey, M. Venkatesan and C.B. Fitzgerald
    Donor impurity-band exchange in dilute ferromagnetic oxides
    Nature Materials 4, 173-6 (2005).
  10. M. Venkatesan, C. B. Fitzgerald, J.M.D. Coey
    Unexpected magnetism in a dielectric oxide
    Nature 430, 630 (2004).
  11. 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).
  12. 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).
  13. 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).

  1. J. M.D. Coey and M. Venkatesan
    An introduction to magnetic oxides
    Functional Metal Oxides: New Science and Novel Applications, Ed. T. Venkatesan, M.R. Blamire & S.B. Ogale, Wiley-VCH Weinheim (2013).
  2. M. Venkatesan
    Half metals
    Handbook of Magnetism and Advanced Magnetic Materials. Edited by Helmut Kronmuller and Stuart Parkin. Volume 4: Novel Materials. 2007 John Wiley & Sons, Ltd.
  3. J.M.D. Coey, M. Venkatesan and M.A. Bari
    Half-metallic Ferromagnets
    Lecture notes in Physics, Springer-Verlag Series (2002).

Details of publications in refereed International Journals

120+ scientific publications in well reputed, refereed international journals including 5 in Nature, 1 in Science Advances, several patents, and three book chapters. Citations were currently running at the rate of ~ 800 per year. Top 10 publications were cited more than 3000 times in refereed international journals. h-index= 37.

Total number of citations:10130
h-index: 37
i10 index : 74

Source

  1. A.S. Esmaeily, M Venkatesan, S. Sen, J.M.D. Coey
    d-zero Magnetism in Nanoporous Amorphous Alumina Membranes
    Physical Review Materials, 2 (2018) 054405.
  2. F. Eskandari, S.B. Porter, M. Venkatesan, P. Kameli, K. Rode, J.M.D. Coey
    Magnetization and anisotropy of cobalt ferrite thin films
    Physical Review Materials, 1 (7) (2017) 074413.
  3. S.B. Porter, M. Venkatesan, P. Dunne, B. Doudin, K. Rode, J.M.D. Coey
    Magnetic Dead Layers in La0.7Sr0.3MnO3 Revisited
    IEEE Transactions on Magnetics, 53 (11) (2017) 6000904.
  4. K.E. Siewierska, G. Atcheson, K. Borisov, M. Venkatesan, K. Rode, J.M.D. Coey
    Study of the Effect of Annealing on the Properties of Mn2RuxGa Thin Films
    IEEE Transactions on Magnetics, 53 (11) (2017) 2600505.
  5. A. Rostamnejadi, M. Venkatesan, H. Salamati, K. Ackland, H. Gholizadeh
    Magnetic properties, exchange bias, and memory effects in core-shell superparamagnetic nanoparticles of La0.67Sr0.33MnO3
    Journal of Applied Physics, 121 (2017) 173902.
  6. S. Sanvito, C. Oses, J. Xue, A. Tiwari, M. Zic, T. Archer, P. Tozman, M. Venkatesan et al
    Accelerated discovery of new magnets in the Heusler alloy family
    Science Advances 3 , (4) (2017), e1602241.
  7. C. Healy, B. Twamley, M. Venkatesan, S. Schmidt, T. Gunnlaugsson
    AHetero-metallic, functionalizable polyoxomolybdate clusters via a 'top-down' synthetic method
    Chemical Communications, 53 (2017) 10660-10663
  8. J.M.D. Coey, K. Ackland, M. Venkatesan and S. Sen
    Collective magnetic response of CeO2 nanoparticles
    Nature Physics 12, (2016) 694
  9. W. Lu, S. Saha, R. Wang, M. Venkatesan et al
    Long-range magnetic coupling across a polar insulating layer
    Nature Communications 7, (2016) 11015.
  10. J.M.D Coey, M. Venkatesan, P. Stamenov
    Surface magnetism of strontium titanate
    Journal of Physics: Condensed Matter 28 , (2016) 485001.
  11. T.O. Chimamkpam, R. Clérac, D. Mitcov, B. Twamley, M. Venkatesan, W. Schmitt
    Structural variation in cation-assisted assembly of high-nuclearity Mn arsonate and phosphonate wheels
    Dalton Transactions 45, (2016) 1349.
  12. P. Tozman, M. Venkatesan, J.M.D. Coey
    Optimization of the magnetic properties of nanostructured Y-Co-Fe alloys for permanent Magnets
    AIP Advances 6 , (2016) 056016.
  13. Y.H. Chen, J.F. Zhou, R. O'Connell, W. Schmitt, M. Venkatesan, M. Coey, H.Z. Zhang
    Synthesis, characterization and magnetic properties of ultrafine Co3O4 octahedra
    AIP Advances 5 , 087122 (2015).
  14. P. Tozman, M. Venkatesan, G.A. Zickler, J. Fidler and J.M.D. Coey
    Enhanced energy product in Y-Co-Fe magnets intermediate between Nd-Fe-B and ferrite
    Appl. Phys. Lett. , 107 032405 (2015).
  15. P. McGuiness, O. Akdogan, M. Venkatesan, P. Tozmon, J.M.D. Coey et al
    Replacement and Original Magnet Engineering Options (ROMEOs): A European Seventh Framework Project to Develop Advanced Permanent Magnets Without, or with Reduced Use of, Critical Raw Materials
    JOM 67, 1306 (2015).
  16. H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda,and J. M. D. Coey Cubic
    Characterization of the magnetism of lycopodium spores
    Phys. Rev. Lett. 112 , 027201 (2014).
  17. K. Ackland, M. Venkatesan and J. M. D. Coey
    Characterization of the magnetism of lycopodium spores
    IEEE Trans. Magnetics. 50, , 6971629 (2014).
  18. M. Venkatesan, P. Kavle, S.B. Porter, K. Ackland and J. M. D. Coey
    Magnetic analysis of polar and nonpolar oxide substrates
    IEEE Trans. Magnetics. 50 , 6971312 (2014).
  19. A. Rostamnejadi, M. Venkatesan, P. Kameli, H. Salamati, J.M.D. Coey, J.M.D.
    Cooling-field dependence of exchange bias effect in La0.45Sr0.55MnO3 nanoparticles
    Appl. Phys. 50 , 6971312 (2014).
  20. K. Rode, N. Baadji, D. Betto, Y.C. Lau, H. Kurt, M. Venkatesan, P. Stamenov, S. Sanvito, J.M.D. Coey
    Site-specific order and magnetism in tetragonal Mn3Ga thin films
    Phys. Rev. B, 87, 184429 (2013).
  21. H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda,and J.M.D. Coey
    Cubic Development of hysteresis in ball-milled LaCo5-xFex and La2Co7-xFex
    IEEE Trans. Magnetics. 50 , 6971312 (2014).
  22. H. Kurt, K. Rode, P. Stamenov, M. Venkatesan et al
    Cubic Mn2Ga Thin films: Crossing the spin gap with ruthenium
    Phys. Rev. Lett., , 112, 027201 (2014).
  23. H. Kurt, K. Rode, M. Venkatesan, P. Stamenov and J.M.D. Coey
    High spin polarization in epitaxial films of ferromagnetic Mn3Ga
    Phys. Rev. B., 83, 020405 (2011).
  24. H. Kurt, K. Rode, H. Tokuc, P. Stamenov, M. Venkatesan, and J.M.D. Coey
    H Exchange-biased magnetic tunnel junctions with antiferromagnetic Mn3Ga
    Appl. Phys. Lett., 101 232402 (2012).
  25. L. Zhang, C.I. Onet, R. Clerac, M. Rouzieres, B. Marzec, M. Boese, M. Venkatesan, W.Schmitt
    A facile "bottom-up" approach to prepare free-standing nano-films based on manganes coordination clusters
    Chem. Comm. 49 , 7400 (2013)
  26. L.M.A. Monzon, K. O'Neill, Y. Sheth, M. Venkatesan and J.M.D. Coey
    Fabrication of multi-segmented magnetic wires with micron-length copper spacers
    Electrochemistry Communications , 96 (2013).
  27. M. Hakimi, M. Venkatesan, K. Rode, K. Ackland, J.M.D. Coey
    The zero-magnetization Heusler ferrimagnet
    J. Appl. Phys. 113, 17B101 (2013).
  28. M. Venkatesan, P. Dunne, Y.H. Chen, H.Z. Zhang, J.M.D. Coey
    Structural and magnetic properties of iron in graphite
    Carbon 56/strong>, 279 (2013).
  29. A.S. Esmaeily, M. Venkatesan, Asra S. Razavian, J. M. D. Coey
    Diameter-modulated ferromagnetic CoFe nanowires
    J. Appl. Phys. 113, 17A327 (2013).
  30. L.M.A. Monzon, K. Ackland, S. Mosivand, M. Venkatesan, J.M.D. Coey
    The role of polyaniline in the formation of iron-containing nanocomposites
    Journal of Nanoparticle Research 15, 11 (2013).
  31. H. Kurt, K. Rode, H. Tokuc, P. Stamenov, M. Venkatesan and J.M.D. Coey
    Exchange-biased magnetic tunnel junctions with antiferromagnetic ? -Mn3Ga
    Appl. Phys. Lett. 101, 232402 (2012).
  32. H. Kurt, N. Baadji, K. Rode, P. Stamenov, M. Venkatesan, S. Sanvito and J.M.D. Coey
    Magnetic and electronic properties of D022-Mn3Ge (001) films
    Appl. Phys. Lett. 101, 132410 (2012).
  33. J.F. Feng, H. Kurt, M. Venkatesan and J.M.D. Coey
    Tunable coercivity in perpendicular (CoFe/Tb)(n)/CoFe multilayers
    Thin Solid Films, 520, 7173 (2012).
  34. K. Ackland, M. Venkatesan and J.M.D. Coey
    Magnetism of BaB6 thin films synthesized by pulsed laser deposition
    J. Appl. Phys. 111, 07A322 (2012).
  35. L.M.A. Monzon, K. Road, M. Venkatesan and J.M.D. Coey
    Electosynthesis of Iron, Cobalt and Zinc-microcrystals and magnetic enhancement of the oxygen reduction reaction
    Chemistry of Materials b, 24, 3878 (2012).
  36. J.F. Feng, K Rode, K. Ackland, M. Venkatesan and J.M.D. Coey
    Ultrathin (CoFe/Pt)(n) multilayers with tuned magnetic properties
    J. Magn. Magn. Mater. 324, 2298 (2012).
  37. L. Zhang, R. Clerac, C.I. Onet, M. Venkatesan, P. Heijboer, W. Schmitt
    Supramolecular approach by using Jahn-Teller sites to construct a {Mn-13}-based coordination polymer and modify its magnetic Properties
    Chemistry-A European Journal, 18, 13984 (2012).
  38. H. Kurt, K. Rode, M. Venkatesan, P. Stamenov and J.M.D. Coey
    High spin polarization in epitaxial films of ferromagnetic Mn3Ga
    Phys. Rev. B. 83, 020405 (2011).
  39. Fiona N. Byrne, L.M.A. Monzon, P. Stamenov, M. Venkatesan and J.M.D. Coey
    Influence of an Au capping layer on the magnetic properties of CoPt nanowires
    Appl. Phys. Lett. 98 252507 (2011).
  40. K. Ackland, L.M.A. Monzon, M. Venkatesan and J.M.D. Coey
    Magnetism of nanostructure CeO2
    IEEE Transactions on Magnetics 47 3509 (2011).
  41. H. Kurt, K. Rode, M. Venkatesan, P. Stamenov and J.M.D. Coey
    Mn3-xGax (0 < x < 1): Multifunctional thin film materials for spintronics and magnetic recording
    Phys. Status Solidi B 248 2338 (2011),
  42. A. Rostamnejadi, M. Venkatesan. P. Kameli, H. Salamati and J.M.D. Coey.
    Magnetocaloric effect in La0.67Sr0.33MnO3 manganite above room temperature
    J. Magn. Magn. Materials 323 2214 (2011).
  43. J. F. Feng, J. Y. Chen, M. Venkatesan, G. Feng, X. F. Han, and J. M. D. Coey
    Superparamagnetism in MgO-based magnetic tunnel junctions with a thin pinned ferromagnetic electrode
    Phys. Rev. B. 81, 205212 (2010).
  44. A. Rostamnejadi, M. Venkatesan. J. Alaria, M. Boese, P. Kameli, H. Salamati and J.M.D. Coey
    Conventional and inverse magnetocaloric effects in La0.45Sr0.55MnO3 nanoparticles
    J. Appl. Phys. 110 043905 (2011).
  45. P. Granitzer, K. Rumpf, M. Venkatesan et al.
    Magnetic behaviour of a magnetite/silicon nanocomposite
    J. Nanoparticle Research. 13 5685 (2011).
  46. P. Granitzer, K. Rumpf, M. Venkatesan et al.
    Structural and magnetic characterization of a porous silicon/Fe3O4 composite
    Phys. Status Solidi C 8 1739 (2011).
  47. S. Krishnamurthy, B. Kennedy. F. McGee, M. Venkatesan, J. M. D. Coey et al
    Resonant soft X-ray emission and X-ray absorption studies on Ga1-xMnxN grown by pulsed laser deposition
    Phys. Status Solidi C 8 1608 (2011).
  48. P. Granitzer, K. Rumpf, M. Venkatesan
    Influence of a semiconducting matrix on the magnetic behaviour of iron oxide nanoparticles study of Fe3O4 nanoparticles
    J. Phys.C 303 01243 (2011).
  49. H. Kurt, M. Venkatesan and J.M.D. Coey
    Epitaxial perpendicular magnetic anisotropy in Co/Ni multilayers with a thin seed layer
    J. Appl. Phys. 108 073916 (2010).
  50. M. Venkatesan, H. Tokuc, F. Burke, G. Szulczewski and J.M.D. Coey
    Magnetic properties of the Co/Alq3 interface
    J. Appl. Phys. 109 07C507 (2010).
  51. J.M.D. Coey, P. Stamenov, R.D. Gunning, M. Venkatesan and K. Paul,
    Ferromagnetism in defect-ridden oxides and related materials
    New J. Phys. 12 053025 (2010).
  52. P. Granitzer, K. Rumpf, M. Venkatesan, et al.
    Magnetic study of Fe3O4 nanoparticles incorporated within mesoporous silicon
    J. Electrochemical Society. 157 K145 (2010).
  53. U.P. Apfel, D. Troegel, Y. Halpin, M. Venkatesan et al
    Models for the Active Site in [FeFe] Hydrogenase with Iron-Bound Ligands Derived from Bis-, Tris-, and Tetrakis(mercaptomethyl)silanes
    Inorganic Chemistry 49 10117 (2010).
  54. Z. Diao, M. Abid, P. Upadhyaya, M. Venkatesan and J.M.D. Coey
    Vortex states in soft magnets in two and three dimensions
    J. Magn. Magn. Mater., 322, 1304 (2010).
  55. K. Wongsaprom, M. Venkatesan, S. Maensiri and J.M.D. Coey
    Magnetism of nanocrystalline (La0.5Sr0.5)TiO3 doped with 3d cations
    J. Phys. C: Condens. Matter., 22, 096004 (2010).
  56. P. Stamenov, T. Jochmann, M. Venkatesan and J.M.D. Coey
    Schottky barriers of rare-earth transition-metal intermetallics on silicon
    J. Phys. C 200 072094 (2010)
  57. M. O'Sullivan, P. Stamenov, J. Alaria, M. Venkatesan and J.M.D. Coey
    Magnetoresistance of CuCrO2 delafossite films
    J. Phys. C 200 052021 (2010)
  58. B.J. Arnold, S. Krishnamurthy, B. Kennedy, D. Cockburn, D. McNally, J.G. Lunney, R. Gunning, M. Venkatesan
    Growth and characterisation of Al1-xCrxN thin films by RF plasma assisted pulsed laser deposition
    Journal of Surface Science and Nanotechnology 7 497 (2009).
  59. T. Bala, R.D. Gunning, M. Venkatesan et al.,
    Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium
    Nanotechnology 20, 415603 (2009).
  60. R.D. Gunning, K. Rode, S.R.G. Sofin, M. Venkatesan et al.,
    Thin films of semiconducting lithium ferrite produced by pulsed laser deposition
    Appl. Surf. Sci. 255, 5245 (2009).
  61. P.J. Grace, M. Venkatesan, J. Alaria et al.,
    The Origin of the Magnetism of Etched Silicon
    Advanced Materials, 21, 71 (2009).
  62. K. Rode, R.D. Gunning, R.G.S Sofin, M. Venkatesan et al.,
    Magnetic anisotropy in ilmenite- hematite solid solution thin films grown by pulsed laser ablation
    J. Magn. Magn. Mater. 320, 3238 (2008).
  63. J.M.D. Coey, K. Wongsaprom, J. Alaria and M. Venkatesan
    Charge-transfer ferromagnetism in oxide nanoparticles
    J. Appl. Phys. D: Appl. Physics. 41, 134012 (2008).
  64. J. Alaria, N. Cheval, K. Rode, M. Venkatesan and J.M.D. Coey
    Structural and magnetic properties of wurtzite CoO thin films
    J. Appl. Phys. D: Appl. Physics. 41, 135004 (2008).
  65. S.A. Corr, Y.K. Gun'ko, A.P. Douvalis, M. Venkatesan, R.D. Gunning and P.D. Nellist,
    From nanocrystals to nanorods: New iron oxide-silica nanocomposites from metallorganic precursors
    J. Physical Chemistry, 112, 1008 (2008).
  66. M. Venkatesan, P. Stamenov, L.S. Dorneles, R.D. Gunning, B. Bernoux and J.M.D. Coey, Magnetic, magnetotransport, and optical properties of Al-doped Zn0.95Co0.05O thin films
    Appl. Phys. Lett., 90, 242508 (2007).
  67. L.S. Dorneles, M. Venkatesan, R. Gunning, P. Stamenov, J. Alaria, M. Rooney, J.G. Lunney, and J.M.D. Coey,
    Magnetic and structural properties of Co-doped ZnO thin films
    J. Magn. Magn. Mater., 310, 2087 (2007).
  68. G. La Spina, R. Clerac, E.S. Collins, T. McCabe, M. Venkatesan, I. Ichinose and W. Schmitt,
    Engineering coordination assemblies of dinuclear Cu-II complexes
    Dalton Transactions, 45, 5248 (2007).
  69. L.S. Dorneles, M. Venkatesan, R. Gunning, P. Stamenov, J. Alaria, M. Rooney, J.G. Lunney and J.M.D. Coey
    Magnetic and structural properties of Co-doped ZnO thin films
    J. Magn. Magn. Mater., 310, 2087 (2007).
  70. 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).
  71. R.D. Gunning, M. Venkatesan, D.H. Grayson and J.M.D. Coey
    Magnetic properties of CNx whiskers
    Carbon, 44, 3213 (2006).
  72. 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).
  73. 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).
  74. 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).
  75. 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).
  76. 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).
  77. 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).
  78. 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).
  79. 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).
  80. 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).
  81. 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).
  82. 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).
  83. J.M.D. Coey, M. Venkatesan and C.B. Fitzgerald Donor impurity-band exchange in dilute ferromagnetic oxides Nature Materials, 4, 173 (2005).
  84. 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).
  85. 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).
  86. 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).
  87. 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).
  88. M. Venkatesan, C.B. Fitzgerald and J.M.D. Coey
    Unexpected magnetism in dielectric oxide
    Nature, 430, 630 (2004).
  89. 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).
  90. 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).
  91. 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).
  92. 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).
  93. 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).
  94. E. Clifford, M. Venkatesan and J.M.D. Coey
    Magnetoresistance in MnBi nanocontacts
    J. Magn. Magn. Mater., 272, 1614 (2004).
  95. 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).
  96. M. Venkatesan, S. Nawka, S.C. Pillai and J.M.D. Coey
    Enhanced magnetoresistance in nanocrystalline magnetite
    J. App. Phys ., 93, 8023-8025 (2003).
  97. M. Venkatesan, S. Nawka, S.C. Pillai and J.M.D. Coey
    Enhanced magnetoresistance in nanocrystalline magnetite
    J. App. Phys., 93, 8023 (2003).
  98. 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).
  99. 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).
  100. 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).
  101. 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)
  102. 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).
  103. J.M.D. Coey, J. Versluijs and M. Venkatesan
    Half-metallic oxide point contacts
    J. Phys. D: Appl. Phys . 35, 2457 (2002).
  104. 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).
  105. 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).
  106. 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).
  107. 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).
  108. M. Venkatesan, Chengbao Jiang and J.M.D. Coey
    1:7 alloys produced by mechanical milling
    J. Magn. Magn. Mater ., 242-245, 1350 (2002).
  109. 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).
  110. J.M.D. Coey and M. Venkatesan Half-metallic ferromagnetism:The example of CrO2
    J. Appl. Phys ., 91, 8345 (2002).
  111. 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).
  112. 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).
  113. 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).
  114. A.P. Douvalis, M. Venkatesan and J.M.D. Coey Iron valence in double perovskites . Hyperfine interactions , 5 , 131 (2001).
  115. 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).
  116. 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).
  117. 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).
  118. 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).
  119. 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).
  120. 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).
  121. 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).
  122. M. Venkatesan, U.V. Varadaraju and K.V.S. Rama Rao
    Magnetic transitions in HoErFe17-xGaxC compounds
    Solid State Commun. , 113, 345 (2000).
  123. 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).
  124. 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).
  125. 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).
  126. 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).
  127. 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).