S. N. Piramanayagam
Data Storage Institute, Singapore

S. N. Piramanayagam is a Research Scientist in Data Storage Institute. He obtained his Ph.D. degree in 1994 from Indian Institute of Technology, Bombay, India, for his work on amorphous ferromagnetic alloys. After his Ph.D., he worked on hard magnetic NdFeB thin films for recording and MEMS applications, in Shinshu University, Japan, 1995–1999. Since 1999, he has been with Data Storage Institute, Singapore, serving in various capacities. He has 18 years of experience in the field of magnetic materials. Dr. S. N. Piramanayagam is actively involved in the field of nanotechnology of recording media for the past 10 years. He has worked on antiferromagnetically coupled media and oriented longitudinal media for hard disk drive applications. Currently, his focus has been on perpendicular media and patterned media. He has published more than 60 papers and 9 patents. He has also delivered several invited talks in conferences such as ICMAT 2005, ISPMM 2005, TMRC 2002, TMRC 2006, and Joint MMM/Intermag 2007. He is also involved in the organization of ISPMM 2005 and acted as session chairs in several conferences including Intermag. He has an adjunct position in National University of Singapore, where he has been teaching about 100 students every year, in the field of magnetic materials for data storage. In addition, he also conducts several courses to industry engineers. He is also actively involved with IEEE Magnetics Society activities, where he has been playing the roles of secretary and chairman of the Singapore chapter.

Biography Updated on 18 December 2007

Articles in Scholarly Journals [Incomplete List]

  1. Achieving High Aspect Ratio of Track Length to Width in Molds for Discrete Track Recording Media
    Research Letters in Nanotechnology, vol. 2008, Article ID 765398, 4 pages, 2008
  2. Magnetic and transport properties of Co-doped Fe[sub 3]O[sub 4] films
    Journal of Applied Physics, vol. 101, no. 1, p. 013904, 2007
  3. Spin-transfer induced noise in nanoscale magnetoresistive sensors
    Journal of Applied Physics, vol. 101, no. 7, p. 073911, 2007
  4. Magnetic and Microstructural Properties of CoCrPt:Oxide Perpendicular Recording Media With Novel Intermediate Layers
    IEEE Transactions on Magnetics, vol. 43, no. 2, pp. 633–638, 2007
  5. High Writability Perpendicular Recording Media With Low Noise Crystalline Soft Underlayer
    IEEE Transactions on Magnetics, vol. 43, no. 2, pp. 873–875, 2007
  6. Low-Noise Crystalline Soft Underlayer for CoCrPt:SiO$_{2}$ Perpendicular Recording Media
    IEEE Transactions on Magnetics, vol. 43, no. 6, pp. 2100–2102, 2007
  7. Corrosion performance of thin hydrogenated amorphous carbon films prepared by magnetron sputtering?
    Diamond and Related Materials, vol. 16, no. 9, pp. 1716–1721, 2007
  8. Novel hybrid facing targets sputtered amorphous carbon overcoat for ultra-high density hard disk media
    Diamond and Related Materials, vol. 16, no. 2, pp. 379–387, 2007
  9. Role of substrate bias on the magnetic properties and microstructure of CoCrPt:SiO[sub 2] perpendicular recording media
    Journal of Applied Physics, vol. 101, no. 10, p. 103914, 2007
  10. Effect of seed layers on the textured growth of Pd/Ru intermediate layers for perpendicular recording media
    Journal of Magnetism and Magnetic Materials, vol. 312, no. 2, pp. 476–479, 2007
  11. Perpendicular recording media for hard disk drives
    Journal of Applied Physics, vol. 102, no. 1, p. 011301, 2007
  12. Sub-6-nm grain size control in polycrystalline thin films using synthetic nucleation layer
    Applied Physics Letters, vol. 91, no. 14, p. 142508, 2007
  13. Palladium-based intermediate layers for CoCrPt–SiO[sub 2] perpendicular recording media
    Applied Physics Letters, vol. 88, no. 9, p. 092506, 2006
  14. Grain size reduction in CoCrPt:SiO[sub 2] perpendicular recording media with oxide-based intermediate layers
    Applied Physics Letters, vol. 89, no. 16, p. 162504, 2006
  15. Novel approaches to high-density perpendicular recording media
    Journal of Magnetism and Magnetic Materials, vol. 303, no. 2, pp. 287–291, 2006
  16. Investigations on nano-structured perpendicular recording media for high density data storage
    Thin Solid Films, vol. 505, no. 1-2, pp. 71–76, 2006
  17. Influence of gas pressures on the magnetic properties and recording performance of CoCrPt–SiO2SiO2 perpendicular media
    Journal of Magnetism and Magnetic Materials, vol. 303, no. 2, pp. e145–e151, 2006
  18. Nano-scratch resistance study of nitrogenated amorphous carbon films prepared by unbalanced magnetron sputtering
    Journal of Magnetism and Magnetic Materials, vol. 303, no. 2, pp. e115–e119, 2006
  19. Textured growth of CoFe for soft underlayers in CoCrPt:SiO2 perpendicular magnetic recording media
    Journal of Magnetism and Magnetic Materials, vol. 303, no. 2, pp. e152–e155, 2006
  20. Effect of cobalt doping concentration on the structural and magnetic properties of Fe3O4
    Thin Solid Films, vol. 505, no. 1-2, pp. 45–49, 2006
  21. Advanced perpendicular recording media structure with a magnetic intermediate layer
    Applied Physics Letters, vol. 88, no. 9, p. 092501, 2006
  22. Stacked CoCrPt:SiO<tex>$_2$</tex>Layers for Perpendicular Recording Media
    IEEE Transactions on Magnetics, vol. 41, no. 10, pp. 3190–3192, 2005
  23. Influence of dual-Ru intermediate layers on magnetic properties and recording performance of CoCrPt–SiO[sub 2] perpendicular recording media
    Applied Physics Letters, vol. 87, no. 22, p. 222503, 2005
  24. Magnetotransport properties of nano-constriction array in La0.67Sr0.33MnO3 film
    The European Physical Journal B, vol. 48, no. 1, pp. 37–40, 2005
  25. Investigations on annealed Ni?P in Al?Mg/Ni?P substrates as soft underlayer for perpendicular recording media
    Journal of Magnetism and Magnetic Materials, vol. 287, pp. 271–275, 2005
  26. A study of orientation ratio in longitudinal magnetic thin-film media on plasma-treated textured substrates
    Applied Physics A, vol. 81, no. 1, pp. 147–150, 2004
  27. FePt and Fe nanocomposite by annealing self-assembled FePt nanoparticles
    Journal of Applied Physics, vol. 95, no. 11, p. 6735, 2004
  28. Synthesis and magnetic behavior of self-assembled Co nanorods and nanoballs
    Journal of Applied Physics, vol. 95, no. 11, p. 6801, 2004
  29. Magnetization and thermal stability studies on laminated antiferromagnetically coupled (LAC) media
    IEEE Transactions on Magnetics, vol. 39, no. 2, pp. 657–662, 2003
  30. Dynamic orientation ratio in longitudinal recording media
    Applied Physics Letters, vol. 83, no. 6, p. 1175, 2003
  31. Thermal stability investigations on laminated antiferromagnetically coupled media
    Journal of Applied Physics, vol. 91, no. 10, p. 8620, 2002
  32. Ultrasmall grain size control in longitudinal recording media for ultrahigh areal densities
    Journal of Applied Physics, vol. 91, no. 10, p. 7685, 2002
  33. Design of laminated antiferromagnetically coupled media for beyond 100 Gb/in[sup 2] areal density
    Journal of Applied Physics, vol. 91, no. 10, p. 7694, 2002
  34. Advanced laminated antiferromagnetically coupled recording media with high thermal stability
    Applied Physics Letters, vol. 80, no. 4, p. 616, 2002
  35. Advanced laminated antiferromagnetically coupled media with high thermal stability and low noise
    IEEE Transactions on Magnetics, vol. 38, no. 5, pp. 1940–1942, 2002
  36. Magnetic properties and switching field control of antiferromagnetically coupled recording media
    IEEE Transactions on Magnetics, vol. 37, no. 4, pp. 1438–1440, 2001
  37. Anti-ferromagnetic coupling effects on energy barrier and reversal properties of recording media
    IEEE Transactions on Magnetics, vol. 37, no. 4, pp. 1445–1448, 2001
  38. A method to determine dynamic remnant coercivity over a larger time-scale
    IEEE Transactions on Magnetics, vol. 37, no. 4, pp. 1950–1952, 2001
  39. Magnetic field and thermal reversal properties of exchange-bias recording films
    IEEE Transactions on Magnetics, vol. 37, no. 4, pp. 1500–1503, 2001
  40. Noise reduction mechanisms in laminated antiferromagnetically coupled recording media
    Applied Physics Letters, vol. 79, no. 15, p. 2423, 2001
  41. Thermal energy consideration in micromagnetic simulation for laminated antiferromagnetically coupled recording media
    Applied Physics Letters, vol. 79, no. 11, p. 1646, 2001
  42. Role of thermal energy on the magnetic properties of laminated antiferromagnetically coupled recording media
    Journal of Applied Physics, vol. 90, no. 7, p. 3442, 2001
  43. La–Zn substituted hexagonal Sr ferrite thin films for high density magnetic recording
    Journal of Applied Physics, vol. 87, no. 5, p. 2503, 2000
  44. Perpendicular magnetic anisotropy in NdFeB thin films
    Journal of Applied Physics, vol. 85, no. 8, p. 5898, 1999
  45. Studies on NdFeB thin films over a wide composition range
    Journal of Alloys and Compounds, vol. 281, no. 1, pp. 27–31, 1998
  46. Controlling the magnetization reversal mechanism in Co/Pd multilayers by underlayer processing
    IEEE Transactions on Magnetics, vol. 33, no. 5, pp. 3247–3249, 1997
  47. Synthesis of Nd-Fe-B thin films with high coercive force by cosputtering
    IEEE Transactions on Magnetics, vol. 33, no. 5, pp. 3643–3645, 1997
  48. Onset of a different scattering mechanism with Fe and Mn substitution in the magneto-transport of a-Co80-x-yFexMnyB12Si8 alloys
    Solid State Communications, vol. 97, no. 3, pp. 203–207, 1996
  49. Mössbauer study of interface mixing in multilayers
    Journal of Magnetism and Magnetic Materials, vol. 140-144, pp. 555–556, 1995
  50. Oriented strontium ferrite films sputtered onto Si(111)
    Journal of Magnetism and Magnetic Materials, vol. 140-144, pp. 723–724, 1995
  51. Magnetoresistance measurements on Fe- and Co-rich amorphous alloys
    Journal of Magnetism and Magnetic Materials, vol. 140-144, pp. 281–282, 1995
  52. Selective synthesis of light alkenes from carbon monoxide and hydrogen on silicalite supported iron-manganese catalysts
    Applied Catalysis A: General, vol. 107, no. 1, pp. 73–81, 1993
  53. The effect of Mn addition on hyperfine field parameters of a-Co-Fe-B-Si alloys
    Solid State Communications, vol. 76, no. 2, pp. 93–96, 1990