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Biography

Expertise in (i) the design and development of rare-earth permanent magnets through advanced processing routes for automotive and EV applications, (ii) materials for energy applications including magnetic refrigeration, thermoelectric power generation, and supercapacitors, and (iii) the synthesis and characterization of Fe–As and NaₓCoO₂-based superconductors. Possesses strong hands-on experience in advanced materials characterization techniques such as PPMS (MH, MT, specific heat, resistivity), XRD, XPS, DSC, TGA/DTA, SEM, particle size analysis, B–H loop tracing, and electrochemical workstations.

Research Areas of Interest

• Permanent magnetic materials
• Magnetocaloric materials 
• Superconducting materials

Highest Qualification

Ph.D (Physics)

List of Publications

1. Magnetic behaviour and magnetic entropy change of laves phase Fe2Ti intermetallic, Kowsalya Murugan, S. Paulraj, Srikanti Kavita and Kathirvel Venugopal, Solid State Communications 405 (2025) 116138
2. Three-dimensional critical behavior in Mn1.5Cr1.5O4: A material for magnetocaloric energy conversion, Kowsalya Murugan, Prakash Govindaraj, S Paulraj, Kathirvel Venugopal, Materials Research Bulletin 179 (2024) 112966
3. Unconventional critical behavior in room temperature magnetocaloric material: Fe30Cr45V25 all d-metal Heusler alloy, Kowsalya Murugan, M. Karunakaran, Srikanti Kavita,          S. Paulraj, Rudra Banerjee, Kathirvel Venugopal, Journal of Solid State Chemistry 332 (2024) 124602
4. An Outlook into the Magnetic and Magnetocaloric Properties of Cr1.3Fe0.7O3, Kowsalya Murugan, Prakash Govindaraj, Sakunthala Ayyasamy, Paulraj Selvaraj, and Kathirvel Venugopal, Physica Status Solidi B (2023), 2200595
5. Microwave-assisted synthesis of cobalt doped WO3 nanostructure as an electrode material for supercapacitor, Dharmalingam Nagaraj, S. Rajagopal, Dayana Lonappan, Pandiyarasan Veluswamy, S. Paulraj, and Kathirvel Venugopal, Journal of Materials Science: Materials in Electronics (2023) 34: 846
6. Investigating the Magnetocaloric Properties of Magnetically Frustrated Delafossite: AgCrO2, Kowsalya Murugan, A. T. Sathyanarayana, Prakash Govindaraj, S. Paulraj, Awadhesh Mani, Kathirvel Venugopal, Journal of Electronic Materials, 52 (2023) 1652
7. Enhanced UV-Irradiated Photocatalytic Degradation of Malachite Green by Porous WO3 Decorated on 2D Graphene Sheet, Nagaraju Perumal, Paulraj Selvaraj, Hariharan Venkatesan, Allen Moses Samuel Elizabeth, Raghu Yuvaraj, Rajeswari Yogamalar Navaneetha Pandian and Jayavel Ramasamy, Applied Biochemistry and Biotechnology, 195 (2023) 3966
8. Ultra-high thermopower of 3D network architectures of ZnO nanosheet and porous ZnO nanosheet coated carbon fabric for wearable multi-applications, Jyothis George, Aiswarya M, Mythri V. K, Suhasini Sathiyamoorthy, S. Paulraj, V. Kathirvel, Malik Maaza, Abhijit Majumdar, Pandiyarasan Veluswamy, Ceramic International, 48, 19 (2022) 28874
9. Facile microwave synthesis of Sn-doped WO3 for pseudocapacitor applications, Dharma Lingam, Vetrivendan, Pandiyarasan V, Rajagopal S, Paulraj S and Kathirvel V, Journal of Materials Science: Materials in Electronics, 33 (2022) 9246
10. Effect of surfactant on the electrochemical performance of tungsten oxide as supercapacitor electrode, Kowsalya M; Paulraj S; Rajagopal S; Premchandran V; Pandiyarasan Veluswamy; Kathirvel Venugopal, Journal of Materials Science: Materials in Electronics 33 (2022) 8833
11. Incorporation of polyaniline on graphene-related materials for wearable thermoelectric applications, Anshu Psnbude, Suhasini Sathiyamoorthy, Kumar R, Shankar H, Paulraj S, Kathirvel V, A. M. Adam, E. M. M. Ibrahim, Pandiyarasan Veluswamy, Materials Letters 304 (2021) 130576
12. Thermoelectric properties of Lenate: A first principle study, Prakash G, Paulraj S, A. M. Adam, E. M. M. Ibrahim, Pandiyarasan Veluswamy, Kathirvel V, Materials Letters 300 (2021) 130146
13. Microwave-assisted synthesis of Ru and Ce doped tungsten oxide for supercapacitor electrode, S. Paulraj, and R. Jayavel, Journal of Materials Science: Materials in Electronics, 29 (2018) 13794
14. Synthesis, structure and magnetic properties of spin ladder compound Ca1-xCoxCu2O3, C. Sekar, S. Paulraj, G. Krabbes, M. Kanagaraj, S. Arumugam and Ravhi S. Kumar, Journal of Magnetism and Magnetic Materials 323 (2011) 3033
15. Effect of rotation of feed and seed rods on the quality of Na0.75CoO2 single crystal grown by traveling solvent floating zone method. C. Sekar, S. Paulraj, P. Kanchana, B. Schüpp-Niewa, R. Klingeler, G. Krabbes and B. Büchner, Materials Research Bulletin 46 (2011) 675
16. Critical properties of superconducting Ba1-xKxFe2As2, A. Bharathi, Shilpam Sharma,          S. Paulraj, A.T. Satya, Y. Hariharan and C. S. Sundar, Physica C: Superconductivity and its applications 470 (2010) 8 
17. Superconductivity in Ru substituted polycrystalline BaFe2-xRuxAs2, Shilpam Sharma,         A. Bharathi, Sharat Chandra, Raghavendra Reddy, S. Paulraj, A. T. Satya, V. S. Sastry, Ajay Gupta and C. S. Sundar, Physical Review B 81 (2010) 174512
18. Pressure-induced superconductivity in BaFe2As2 single crystal, Awadhesh Mani, Nilotpal Ghosh, S. Paulraj, A. Bharathi and C. S. Sundar, Europhysics Letters 87 (2009) 17004
 

Conference Proceedings

1. P. Vivekanandhan, S. Paulraj, and G. Viajayaraghavan, M. Sadhasivam, K.G. Pradeep, D. Prabhu and R. Gopalan, Coercivity enhancement by the grain boundary diffusion in sintered Nd-Fe-B magnet using Dy-Cu and Dy-Al-Cu, International Conference on Magnetic Materials and Applications (ICMAGMA-2023), organized by Organised by Magnetics Society of India in association with Defence Metallurgical Research Laboratory and Mishra Dhatu Nigam Limited (MIDHANI), 04 - 06 Dec. 2023, Hyderabad
2. G. Vijayaragavan, S. Paulraj, P. Vivekanandhan, M. Sadhashivam, K. G. Pradeep., D. Prabhu and R. Gopalan, Coercivity enhancement through Dy-diffusion in sintered Nd-Fe-B magnet by grain boundary diffusion process, 7th International Workshop on Rare Earth and Future Permanent Magnets and Their Applications, University of Birmingham, 3rd-7th September 2023
3. Formulation and characterization of bio plant based nanofluid for oil and gas field Hameed Hussain, Swaminathan Ponmani, Srinivasa Reddy Devarapu, Paulraj S, Nano India 2019 (Supported by Department of Science and Technology), Mahatma Gandhi University, Kottayam, Kerala.
4. Simultaneous structural and optical control of tungsten oxide (WO3) nanoparticles through cobalt doping for L-dopa biosensing applications V. Hariharan, S. Radhakrishnan, M. Parthibavarman, S. Paulraj and C. Sekar, National Conference on Nanoscience and Nanotechnology (NCNN-2011), University of Madras, Chennai.
5. Synthesis and characterization of two- leg spin ladder compound Ca1-xCoxCu2O3,          S. Paulraj, C. Sekar, G. Krabbes, B. Büchner and S. Arumugam, DAE Solid State Physics Symposium 55, 2010 at Manipal University, Manipal. AIP Conf. Proc. 1349 (2011) 1125-1126
6. Growth of phase pure Na0.75CoO2 single crystals by traveling solvent floating zone (TSFZ) method C. Sekar, P. Kanchana, S. Paulraj, G. Krabbes, B. Büchner, DAE Solid State Physics Symposium 55, 2010 at Manipal University, Manipal. AIP Conf. Proc. 1349 (2011) 1207-1208
7. Synthesis and characterization of M1- xKxFe2As2 (M = Ba, Sr,Eu, Yb), S. Paulraj, A. Bharathi, Y. Hariharan and C. S. Sundar, DAE Solid State Physics Symposium 53, 2008 at BARC & TIFR Mumbai, Mumbai.
8. Magnetic behavior in superconducting Ba1-xKxFe2AS2 A. Bharathi, A. T. Satya, S. Paulraj, Y. Hariharan and C. S. Sundar, DAE Solid State Physics Symposium 53, 2008 at BARC & TIFR Mumbai, Mumbai.
9. Synthesis and study of the new iron chalcogenide superconducting systems FeSe1-δ and FeSe1-xTex J. Janaki, T. Geetha Kumary, Awadhesh Mani, S. Kalavathi, S. Paulraj and A. Bharathi, DAE Solid State Physics Symposium 53, 2008 at BARC & TIFR Mumbai, Mumbai
10. The effect of Ca doping on structural, magnetic and electrical properties of                       Gd1-xCaxCo2O5.5±δ, S. Sen, S. Paulraj, J. Janaki, A. Bharathi, Y. Hariharan and C. S. Sundar, International Conference on Magnetic Materials, 2007

Awards & Honours

• UGC – Dr. D. S. Kothari Post-Doctoral Fellow (August 2012 to August 2015)
• Senior Research Fellow (SRF), CSIR Govt. India (April 2010- December 2011)
• Project Fellow of UGC-DAE CSR (November 2006- March 2010)
• Poster Award in 53rd DAE Solid State Physics Symposium-2008 for the poster on “Magnetic behavior in superconducting Ba1-xKxFe2AS2”
• Attended “Summer School in Physics” conducted by Indian Institute of Astro Physics, Kodaikanal from 07 June to 03 July, 2004.