Reseach outcomes

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Publications in peer-reviewed journals

  1. P. J. Krishnanjana, B Paikaray, Chandrasekhar Murapaka*, A Haldar, "Giant tunability of microwave responses for current-driven skyrmions in a tapered nanostructure with notches" Journal of Physics D: Applied Physics (Accepted 2023).
  2. B Panigrahi, MM Raja, Chandrasekhar Murapaka, A Haldar, Bias-Field-Free Microwave Operation in NiFe/FeMn Exchange Biased Bilayers by Varying FeMn Thickness, Journal of Superconductivity and Novel Magnetism (In press 2023).
  3. B Paikaray, K. Mahathi, A Haldar, Chandrasekhar Murapaka*, "Skyrmion based majority logic gate by voltage controlled magnetic anisotropy in a nanomagnetic device", Nanotechnology 34, 225202 (2023).
  4. R. Jaiswal, V. Haragopal, Chandrasekhar Murapaka*, K. V. Nandhini, "Chirality-Dependent Domain Wall Splitting and Recombination in Ferromagnetic Nanostructure with an Anti-dot", Journal of Superconductivity and Novel Magnetism 36, 665 (2023).
  5. S Sivasubramani, B Paikaray, K. Mahathi, A Haldar, Chandrasekhar Murapaka, A. Acharya, "Skyrmion based 3D low complex runtime reconfigurable architecture design methodology of universal logic gate", Nanotechnology 34, 13LT01 (2023).
  6. Talluri Manoj, Hari Prasanth Perumal, Bibekananda Paikaray, Arabinda Haldar, Jaivardhan Sinha, Pinaki Prasad Bhattacharjee, Chandrasekhar Murapaka, "Perpendicular magnetic anisotropy in a sputter deposited nanocrystalline high entropy alloy thin film", Journal of Alloy and Compounds, 167337 (2023). 
  7. B Paikaray, K. Mahathi, A Haldar, Chandrasekhar Murapaka, "Reconfigurable logic operations via gate controlled skyrmion motion in a nanomagnetic device", ACS Applied Electronic Materials 4, 2209 (2022).    
  8. K. Sriram, Jay Pala, Rohiteswar Mondal, Bibekananda Paikaray, Komal Jain, G.A. Basheed, Arabinda Haldar, Chandrasekhar Murapaka, "Effect of annealing on magnetization reversal and spin dynamics in Co40Fe40B20 thin films, Journal of Superconductivity and Novel Magnetism (2022).  
  9. B. Paikaray, S. Somesh, T. Manoj, K. Sriram, H. Basumarty, Arabinda Haldar, Chandrasekhar Murapaka, "Large spin pumping and inverse spin Hall effect in Ta/Py bilayer structures", Physica Status Solidi A: Applications and Materials Science, 2100608 (2022).  
  10. Chokkakula L.P. Pavithra, Reddy Kunda Siri Kiran Janardhana, Kolan Madhav Reddy, Chandrasekhar Murapaka, U. Klement and Suhash R. Dey, "Graphene Oxide Reinforced Magnetic FeCoNiCuZn High Entropy Alloys through Electrodeposition", The Journal of Electrochemistry, 169, 022501 (2022).
  11. K. Sriram, Jay Pala, Bibekanda Paikaray, Arabinda Haldar, Chandrasekhar Murapaka, "Effect of seed layer on Ta crystalline phase and spin Hall angle", Nanoscale 13, 19985 (2021).
  12. Talluri Manoj, Srinu Kotha, Bibekanda Paikaray, Dasari Srideep, Arabinda Haldar, Kotagiri Venkata Rao, Chandrasekhar Murapaka, "Giant Spin Pumping at Ferromagnet (Permalloy) - Organic Semiconductor (Perylene diimide) Interface", RSC Advances 11, 35567 - 35574 (2021).
  13. A Litvinenko, P Sethi, Chandrasekhar Murapaka, A Jenkins, V Cros, P Bortolotti, R Ferreria, B Dieny, U Ebels, "Analog and digital phase modulation and signal transmission with spin torque nano-oscillators" Physical Review Applied, 16 (2), 024048 (2021).
  14. A. Kumar, R. Sharma, K. I. Ali Khan, Chandrasekhar Murapaka, G. J. Lim, W. S. Lew, S. Chaudhary, P. K. Muduli, "Large Damping-like Spin-Orbit Torque and Improved Device Performance Utilizing Mixed-Phase Ta", ACS Applied Electronic Materials, 3, 3139-3146 (2021).
  15. B Paikaray, K. Mahathi , Chandrasekhar Murapaka, A Haldar, "Skyrmion Dynamics in Concentric and Eccentric Nano-Ring Structures", IEEE Transaction on Magnetics (In Press 2021).
  16. B Paikaray, A Joseph, Chandrasekhar Murapaka, A Haldar, "Tunable microwave properties of a skyrmion in an isolated nanodisk" Journal of Magnetism and Magnetic Materials 529, 167900 (2021).
  17. Chokkakula L.P. Pavithra, Reddy Kunda Siri Kiran Janardhana, Kolan Madhav Reddy, Chandrasekhar Murapaka, Xiadong Wang and Suhash R. Dey, "One-dimensional Co-Cu-Fe-Ni-Zn high-entropy alloy nanostructures", Materials Research Letters, 9 (7) 285-290 (2021).
  18. Chokkakula L. P. Pavithra, Reddy Kunda Siri Kiran Janardhana, Kolan Madhav Reddy, Chandrasekhar Murapaka, Joydip Joardar, Bulusu V. Sarada, Rameez R. Tamboli, Yixuan Hu, Yumeng Zhang, Xiaodong Wang and Suhash Ranjan Dey, "An advancement in the synthesis of unique soft magnetic CoCuFeNiZn high entropy alloy thin films" Scientific Reports, 11, 1-8 (2021).
  19. AK Behera, C Murapaka, S Mallick, BB Singh, S Bedanta, Skyrmion Racetrack memory with an antidot, Journal of Physics D: Applied Physics (2020).
  20. GJ Lim, WL Gan, WC Law, C Murapaka, WS Lew, Spin-orbit torque induced multi-state magnetization switching in Co/Pt hall cross structures at elevated temperatures, Journal of Magnetism and Magnetic Materials 514, 167201 (2020).
  21. Gerard Joseph Lim, Daniel Chua, Weiliang Gan, Chandrasekhar Murapaka and Wen Siang Lew, "Programmable Spin-Orbit Torque Logic Device with Integrated Bipolar Bias Field for Chirality Control" Advanced Electronic Materials 6, 1901090 (2020).
  22. Q. Y. Wong, Chandrasekhar Murapaka, W. C. Law, W. L. Gan, G. J. Lim and W. S. Lew, "Enhanced Spin-Orbit Torques in Rare-Earth Pt/[Co/Ni]2/Co/TbSystems", Physical Review Applied 11, 024057 (2019).
  23. S. Krishnia, Chandrasekhar Murapaka, P. Sethi, G. J. Lim, Q. Y. Wong, W. Gan and W. S. Lew, "Current-induced spin-orbit effective field modulations in synthetic antiferromagnetic structures" Journal of Magnetism and Magnetic Materials 475, 327-333 (2019).
  24. U Ebels, J Hem, A Purbawati, A Ruiz Calafora, Chandrasekhar Murapaka, L Vila, K Jaimes Merazzo, E Jimenez, M-C Cyrille, R Ferreira, M Kreissig, R Ma, F Ellinger, R Lebrun, S Wittrock, V Cros, P Bortolotti, "Spintronic based RF components", Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS) 66-67, (2017).
  25. A. Ruiz-Calaforra, A. Purbawati, T. Bracher, J. Hem, Chandrasekhar Murapaka, E. Jimenez-Romero, D. Mauri, A. Zeltser, J. A. Katine, M.-C. Cyrille, L. D. Buda-Prejbeanu, and U. Ebels, "Frequency shift keying in MTJ based Spin torque nano-oscillator with high bit rates" Applied Physics Letters 111, 082401 (2017).
  26. Chandrasekhar Murapaka, P. Sethi, S. Goolaup and W. S. Lew, "Reconfigurable logic via gate controlled domain wall trajectory in magnetic network structure", Scientific Reports 6, 20130 (2016).
  27. P. Sethi, Chandrasekhar Murapaka, S.Goolaup, Y. J. Chen, S. H. Leong and W. S. Lew, "Direct observation of deterministic domain wall trajectory in magnetic network structures", Scientific Reports 6, 19027 (2016).
  28. DW Wong, I Purnama, GJ Lim, WL Gan, Chandrasekhar Murapakaand W. S. Lew, "Current- induced three-dimensional domain wall propagation in cylindrical NiFe nanowires", Journal of Applied Physics 119 (15), 153902 (2016).
  29. P. Sethi, Chandrasekhar Murapaka, G. J. Lim, and W. S. Lew, "In-plane current induced domain wall nucleation and its stochasticity in perpendicular magnetic anisotropy Hall cross structures", Applied Physics Letters 107, 192401 (2015).
  30. Chandrasekhar Murapaka, S. Goolaup, I. Purnama and W. S. Lew, "Coupled domain wall oscillations in magnetic cylindrical nanowires", Journal of Applied Physics 117, 053913 (2015).
  31. Chandrasekhar Murapaka, M. Tran, L. Wang, G. C. Han and W. S. Lew, "Increased stability against spin torque noise in current perpendicular to the plane self-biased differential dual spin valves", Journal of Magnetism and Magnetic Materials 374, 740 (2015).
  32. D. W. Wong, Chandrasekhar Murapaka, W. L. Gan, I. Purnama and W. S. Lew, "Dynamics of three- dimensional helical domain wall in cylindrical NiFe nanowires", Journal of Applied Physics 117, 17A747 (2015).
  33. S. Goolaup, M. Ramu, Chandrasekhar Murapaka and W. S. Lew, "Transverse domain wall profile for logic applications", Scientific Reports 5, 9603 (2015).
  34. Chandrasekhar Murapaka, P. Sethi, S. Goolaup, M. Ramu, Y. J. Chen, S. H. Leong, and W. S. Lew, "Direct observation of domain wall evolution at a bifurcation in magnetic network structures", Applied Physics Express 7, 113003 (2014).
  35. Chandrasekhar Murapaka, S. Goolaup, I. Purnama and W. S. Lew, "Depinning assisted by domain wall deformation in cylindrical nanowires", Journal of Applied Physics 115, 083913 (2014).
  36. C. Guite, I. S. Kerk, Chandrasekhar Murapaka, R. Maddu, S. Goolaup, and W.S. Lew, "All- electrical single domain wall generation for on-chip applications", Scientific Reports, 7, 7459 (2014).
  37. W.L. Gan, Chandrasekhar Murapaka, D.W. Wong, I. Purnama, S.Y. Chiam, N. Wong and W.S. Lew, "Multi-vortex states in magnetic nanoparticles", Applied Physics Letters 105, 152405 (2014).
  38. I. Purnama, Chandrasekhar Murapaka, W. S. Lew and T. Ono, "Remote driving of multiple magnetic domain walls due to topological interaction", Applied Physics Letters 104, 092414 (2014).
  39. R. Maddu, I. Purnama, S. Goolaup, Chandrasekhar Murapaka, and W.S. Lew, "Investigation of dominant spin wave modes by domain walls collision", Journal of Applied Physics 115, 243908 (2014).
  40. Y. P. Liu, S. Goolaup, W. S. Lew, I. Purnama, Chandrasekhar Murapaka, S. Goolaup, T. Zhou and S. K. Wong, "Excitonic bandgap dependence on stacking configuration in four layer graphene", Applied Physics Letters 103, 163108 (2013).
  41. G. C. Han, Q. Jinjun, Q. J. Yap, L. Ping, Chandrasekhar Murapaka, Z. Baoyu, K. C. Weng, "Gap layer effect on performances of differential dual spin valve" , IEEE Transactions on Magnetics. 49, 3714 (2013).
  42. Chandrasekhar Murapaka, H. F. Liew, I. Purnama, W. S. Lew, M. Tran and G. C. Han, "Helical domain walls in constricted cylindrical NiFe nanowires", Applied Physics Letters 101, 152406 (2012).
  43. Chandrasekhar Murapaka, C. C. Wang, G. C. Han and W. S. Lew, "Effect of interlayer coupling on the reversal process of differential dual spin valves", Journal of Applied Physics 111, 07B723 (2012).
  44. X. H. Wang, Chandrasekhar Murapaka, I. Purnama, W. S. Lew, S. Goolaup and C. X. Cong, "Magnetization reversal in nano triangles fabricated by nanosphere lithography", Thin Solid Films 520, 6980 (2012).
  45. X. H. Wang, I. Purnama, Chandrasekhar Murapaka and W. S. Lew, "Highly Stable Vortex State in Sub-100nm Nanomagnets", Applied Physics Express 5, 053001(2012).
  46. Chandrasekhar Murapaka, S. Goolaup, I. Purnama and W. S. Lew, "Crossover in the domain wall potential polarity as function of anti-notch geometry," Journal of Physics D: Applied Physics 44, 235002 (2011).
  47. I. Purnama, Chandrasekhar Murapaka, S. Goolaup and W. S. Lew, "Collective motions assisted by magentostatic interactions in coupled domain wall system," IEEE Transactions on Magnetics. 47, 3081 (2011).
  48. I. Purnama, Chandrasekhar Murapaka, S. Goolaup and W. S. Lew, "Current induced coupled domain walls motion in two-nanowire system," Applied Physics Letters 99, 152501 (2011). (Appeared in Virtual Journal of Nanoscience and Nanotechnology).
  49. A. Amarnath Reddy, Chandrasekhar Murapaka, K. Pradeesh, S. Suresh Babu and G. Vijaya Prakash, "Optical properties of Dy3+ -doped sodium-aluminium-phosphate glasses," Journal of Material Science 46, 2018 (2011).
  50. S. Goolaup, S. C. Low, Chandrasekhar Murapaka and W. S. Lew, "Dependence of pinning on domain wall spin structure and notch geometry," Journal of Physics: Conference Series 266, 012079 (2011).
  51. Y. P. Liu, S. Goolaup, Chandrasekhar Murapaka, W. S. Lew and S. K. Wong, "Effect of magnetic field on the electronic transport in trilayer graphene," ACS Nano, 4, 7087 (2010).

Patents

  1. "Non-Volatile Logic Device", W.S. Lew, Chandrasekhar Murapaka, I. Purnama, S. Goolaup, P. Sethi and C. Guite, US Patent US9431599B2 (Granted).
  2. "Memory device including a domain wall and ferromagnetic driver nanowire", W. S. Lew, I. Purnama and Chandrasekhar Murapaka, US patent US9502090B2 (Granted).
  3. "Magnetic Random Number Generator", P. Sethi, Chandrasekhar Murapaka and W. S. Lew, US patent US01027016B2 (Granted).
  4. "Magnetic logic device, circuit having magnetic logic devices and methods for controlling the magnetic logic device and the circuit", G. J. Lim, Chandrasekhar Murapaka and W. S. Lew, WO Patent App. WO 2021/091484 A1 (2021).
  5. "NiFe/FeMn exchange biased systems for bias field-free magnetization dynaimcs", B. Panigrahi, A. Haldar, Chandrasekhar Murapaka Indian patent (202241051146) (filed) (2022).
  6. "Skyrmion based majority logic gate in nanomagnetic device", B Paikaray, K. Mahathi, A Haldar, Chandrasekhar Murapaka, Indian Patent (202241010372) (Filed) (2022).
  7. "Reconfigurable logic via gate controlled skymrion motion", B Paikaray, K. Mahathi, A Haldar, Chandrasekhar Murapaka, Indian Patent (202141057701) (Filed) (2021). 
  8. "Domain wall tunnelling and logic operations in ferromagnetic nanostructures", Surya Jammalamadaka, Chandrasekhar Murapaka and Sreeveni MD, (201941048936) (Filed) (2020).
  9. "Method of forming a magnetic domain wall in a nanowire", C. Guite, I. S. Kerk, Chandrasekhar Murapaka and W. S. Lew, US patent US20160064060 A1 (Filed) (2018).
  10. "Programmable logic operation via domain wall profile manipulation", S. Goolaup, H. K. Teoh, Chandrasekhar Murapaka, M. Ramu, I. Purnama and W.S. Lew US Provisional Patent 61/748, 337 (2015).
  11. "Coupled domain wall oscillator as microwave generator", W.S. Lew, Chandrasekhar Murapaka, and I. Purnama, US Provisional Patent 61/845,097 (2013).

Book chapter contributions

  1. "Domain wall programmable logic", S. Goolaup, Chandrasekhar Murapaka, W. S. Lew, "Emerging non-volatile memory technologies", Springer (2021).

  2. "Spintronic based memory and logic devices" Jyotirmoy Chatterjee, Pankaj Sethi and Chandrasekhar Murapaka "Nanoscale Devices: Physics, Modeling, and Their Application" Edited by Prof. Brajesh Kumar Kaushik, CRC Press (2018).

  3. "Magnetic domain walls for memory and logic applications", Chandrasekhar Murapaka, Indra Purnama and Wen Siang Lew "Advances in Magnetic Materials: Processing, Properties and Performance", Edited by Prof. Sam Zhang & Prof. Dongliang Zhao, CRC Press (2017).

Research work presented in National/International conferences

  1. "Effect of Ta crystallite size on spin-mixing conductance of Ta/Ni80Fe20 bilayer structure", K. Sriram, M. Talluri, B. Paikaray, Jay Pala, Chandrasekhar Murapaka, IEEE International Magnetics conference (Intermag) 2021, Lyon, France,
  2. "Tunable Microwave properties of a skyrmion in an antidot nanodisk structure". B. Paikatray, K. Mahathi, Chandrasekhar Murapaka, A. Haldar, IEEE International Magnetics conference (Intermag) 2021, Lyon, France
  3. "Electrical detection of spin current in different combinations of Py and Ta bi-layer/tri-layer thin films", B. Paikaray, S. K. Sahoo, M. Talluri, Chandrasekhar Murapaka, A. Haldar, IEEE Around-the-Clock Around-the-Globe Magnetics Conference, Asia Pacific, 2020.
  4. "Spin-orbitronics; Spin to Charge interconversion", (Invited Talk) Chandrasekhar Murapaka, DAE-SSPS 2021 Mumbai.
  5. "Spintronic materials for memory and logic devices" Chandrasekhar Murapaka, Kaleidoscope, Goa 2019.
  6. "Phase shift keying in spin torque nano-oscillators for wireless communication applications", Chandrasekhar Murapaka, A Litvinenko, P Sethi, A Jenkins, V Cros, P Bortolotti, R Ferreria, B Dieny and U Ebels, The International Conference on Magnetic Materials and Applications 2018 NISER Bhubhaneswar, India.
  7. "Realization of MTJ based uniform spin torque oscillators for FSK and PLL system operations" Chandrasekhar Murapaka, A. Ruiz-Calaforra, A. Purbawati, B. Rimmler, E. Jimenez, K. Merazzo-Jaimes, M.-C. Cyrille, L. Vila, R. Ferreira and U. Ebels, 62nd Annual conference on Magnetism and Magnetic Materials (MMM) 2017, Pittsburgh, USA.
  8. "Frequency shift keying with spin torque nano-oscillators", Chandrasekhar Murapaka, A. Ruiz-Calaforra, A. Purbawati, T. Bracher, E. Jimenez, K. Merazzo-Jaimes, M.-C. Cyrille, L. Vila, R. Ferreira and U. Ebels, Magnonics 2017, Oxford UK.
  9. "Enhanced power of spin torque oscillators with Permalloy free layer", Chandrasekhar Murapaka, E. Jimenez, K. Merazzo-Jaimes, A. Ruiz-Calaforra, M.-C. Cyrille, L. Vila, R. Ferreira and U. Ebels, IEEE International Magnetics conference (Intermag) 2017 Dublin, Ireland.
  10. "Magnetic nanoparticle synthesis by chemical slicing", Chandrasekhar Murapaka, W. L. Gan, I. Purnama and W. S. Lew IEEE Magnetics Society symposium Singapore chapter 2013.
  11. "Low current domain-wall oscillators", Chandrasekhar Murapaka I. Purnama and W. S. Lew, International Symposium on Advanced Magnetic Materials and Applications (ISAMMA) 2013 Taichung, Taiwan.
  12. "Anomalous domain wall depinning behavior in cylindrical nanowires", Chandrasekhar Murapaka, I. Purnama and W. S. Lew, Joint European Magnetic Symposia (JEMS) 2013 Rhodes, Greece.
  13. "Striped Cylindrical Nanowire as a Magnetic Domain Wall Nanobarcode", Chandrasekhar Murapaka, H. F. Liew, I. Purnama and W. S. Lew, IEEE International Magnetics conference (Intermag) 2012, Vancouver, Canada.
  14. "Spin Transfer induced Noise in Permalloy- Based Differential Dual Spin Valves" Chandrasekhar Murapaka, M. Tran, C. C. Wang, G. C. Han and W. S. Lew, International conference of young researchers (ICYRAM) 2012, Singapore.
  15. "Crossover in Domain Wall Potential Polarity as a Function of Anti-notch Geomtery", Chandrasekhar Murapaka, S. Goolaup, I. Purnama and W. S. Lew, International conference on Materials for Advanced Technologies (ICMAT) 2011, Singapore.
  16. "Effect of interlayer coupling on the reversal process of differential dual spin valves", Chandrasekhar Murapaka, C. C. Wang, G. C. Han and W. S. Lew, 56th Annual conference on Magnetism and Magnetic Materials (MMM) 2011, Scottsdale, Arizona, USA.
  17. "Electrical characterization of GaN based MIS diodes with high-k dielectrics" G. Singha, G. Agarwal, Chandrasekhar Murapaka and R. Singh, Solid State Physics Symposium (DAE-SSPS) 2008 BARC Mumbai, India.
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