He carried out his research in the field of magnetic devices, Spin Torque Devices, and magnetic spintronic Devices. He worked as an assistant professor at Amrita Vishwa Vidyapeetham University, Chennai Campus, from 17-08-2020 to 1-08-2021. He then worked as an Institute Postdoctoral Postdoctoral Fellow in the Department of Electrical Engineering, IIT Bombay, from March 2021 to March 2022. He moved to work as a a postdoctoral postdoctoral researcher in the Faculty of Physics, Institute of Spintronics and Quantum Information department at Adam Mickiewicz University, Poznan, Poland, from Aug-Dec 2022. Currently, he is working as an assistant professor from Dec 2022 onwards in the Electronics and Communication Engineering Department at the National Institute of Technology Calicut, Kerala, India.
EDUCATION
Dr Nikhil Kumar C S graduated with his Master of Science in Research in Electrical Engineering at IIT Madras in 2014 with a thesis titled Analytic Models for Magnetic Devices(Thesis Supervisor-Prof. Anil Prabhakar, IIT Madras). He graduated with his Doctor of Philosophy in Electrical Engineering at IT Madras in 2020 with a thesis titled Magnonic Devices with Feedback Stabilization(Thesis Supervisor- Prof. Anil Prabhakar, Department of EE, IIT Madras)
RESEARCH, TEACHING, or OTHER INTERESTS
Modeling and Simulation, Electrical and Electronic Engineering, Condensed Matter Physics, Sensory Systems
23
Scopus Publications
97
Scholar Citations
4
Scholar h-index
3
Scholar i10-index
Scopus Publications
Terahertz Fingerprint Detection with Ultrahigh Sensitivity Using 1D Photonic Crystal Cavity Vinayak Kumar Tripathi, Nikhil Kumar C S 4th Wireless Antenna and Microwave Symposium Wams 2025, 2025 A Terahertz (THz) fingerprint detection system using a 1D photonic crystal (PhC) cavity is designed for ultrahigh sensitivity. By leveraging cavity defect modes, this approach enhances light-matter interactions, enabling precise molecular fingerprint detection. The photonic band gap (PBG) confines electromagnetic waves at specific resonant frequencies, improving detection accuracy.CST simulations analyze the effects of mesh refinement and stack number on performance. Results show that finer mesh refinement enhances resonance accuracy, while increasing stacks improves wave confinement and detection sensitivity. However, excessive stacks raise computational complexity without significant gains. This study optimizes sensitivity while maintaining efficiency, making it highly suitable for applications in biomedical diagnostics, security screening, and material identification.
Exciting High-Frequency Short-Wavelength Spin Waves using High Harmonics of a Magnonic Cavity Mode Nikhil Kumar, Paweł Gruszecki, Mateusz Gołębiewski, Jarosław W. Kłos, Maciej Krawczyk Advanced Quantum Technologies, 2024 Spin waves (SWs) are promising objects for signal processing and future quantum technologies due to their high microwave frequencies with corresponding nanoscale wavelengths. However, the nano‐wavelength SWs generated so far are limited to low frequencies. In the paper, using micromagnetic simulations, it is shown that a microwave‐pumped SW mode confined to the cavity of a thin film magnonic crystal (MC) can be used to generate waves at tens of GHz and wavelengths well below 50 nm. These multi‐frequency harmonics of the fundamental cavity mode are generated when the amplitude of the pumping microwave field exceeds a threshold, and their intensities then scale linearly with the field intensity. The frequency of the cavity mode is equal to the ferromagnetic resonance frequency of the planar ferromagnetic film, which overlaps with the magnonic bandgap, providing an efficient mechanism for confinement and magnetic field tunability. The effect reaches saturation when the microstrip feed line covers the entire cavity, making the system feasible for realization.
Enhanced Electrical Modelling of Spin Transfer Torque Magnetic Tunnel Junctions with Temperature Dependent Magnetic Parameters Aswin C Venu, Nikhil Kumar 2024 IEEE International Magnetic Conference Short Papers Intermag Short Papers 2024 Proceedings, 2024 A magnetic tunnel junction, or an MTJ, is a spintronic device of nanoscale dimensions. It is a magneto-electric device that can hold two definite resistance states according to its magnetization states. MTJs can be used as memory elements due to their non-volatile nature. They can be fabricated into chips using VLSI techniques. The main applications of MTJs include computer memory, logic, and neuromorphic computing. This work focuses on the modelling of Spin Transfer Torque and Voltage-Controlled Magnetic Anisotropy Magnetic Tunnel Junctions (STT-VCMA MTJs) using a SPICE-based simulation approach. The study incorporates thermal effects, such as temperature-dependent variations in key parameters like saturation magnetization, spin polarization, uniaxial anisotropy, and VCMA coefficient. Simulations reveal the impact of these temperature-dependent parameters on the switching behavior of MTJs. The results demonstrate that incorporating thermal effects is crucial for accurately capturing the dynamic behavior of MTJs, shedding light on the temperature-sensitive aspects of their operation. This work contributes to the understanding and development of robust SPICE models for STT-VCMA MTJs, facilitating their integration into larger electronic systems and supporting the exploration of novel memory technologies.
Ferroelectric-Modulated Spin to Charge Conversion and THz Emission in Bilayer WTe2 Heterostructures C. Kishandev, J. I. Joy, J. T. Korah, E. Markose and Nikhil Kumar IEEE Transactions on Magnetics, https://ieeexplore.ieee.org/document/11513274 , 2026 2026
Unprecedented dielectric minimization in polymer composite: a novel ultra‐low dielectric constant, polymer composite substrate for millimeter‐wave circuit applications Arun.N. Sathian, Nikhil Kumar and K P Murali Journal of Materials Science: Materials in Electronics 37, 1114 , 2026 2026
Design and Fabrication of a Microstrip Patch Antenna Using a Flexible Low‐Dielectric, Low‐Loss Substrate A Sivan, V Muhammed Azeem, N kumar, KP Murali physica status solidi (a), e202500550 , 2025 2025 Citations: 2
Terahertz Fingerprint Detection with Ultrahigh Sensitivity Using 1D Photonic Crystal Cavity Tripathi Vinayak Kumar,C S Nikhil Kumar IEEE Wireless Antenna and Microwave Symposium (WAMS) 2025, 1-5 , 2025 2025
Quasi Crystal based Circular Patch Antenna with Artificial Magnetic Conductor for Breast Cancer Detection Vishnu Priya Leena, Nikhil Kumar arXiv preprint arXiv:2502.16269 , 2025 2025
High-frequency short-wavelength spin waves in the antidot lattice generated in a nonlinear process Nikhil Kumar, Paweł Gruszecki, Mateusz Gołębiewski, Jarosław W Kłos, Maciej ... International Conference on Magnetism, Bologna, Italy , 2024 2024
Enhanced electrical modelling of spin transfer torque magnetic tunnel junctions with temperature dependent magnetic parameters AC Venu, N Kumar 2024 IEEE International Magnetic Conference-Short papers (INTERMAG Short … , 2024 2024 Citations: 3
Exciting High‐Frequency Short‐Wavelength Spin Waves using High Harmonics of a Magnonic Cavity Mode N Kumar, P Gruszecki, M Gołębiewski, JW Kłos, M Krawczyk Advanced Quantum Technologies, 7, 2400015 , 2024 2024 Citations: 4
Excitation Of High-Frequency Short-Wavelength Spin Waves Via High Harmonics of Magnonic Cavity Mode Nikhil Kumar, Paweł Gruszecki, Mateusz Gołębiewski, Jarosław W Kłos, Maciej ... First Translational Round Table on Magnonics, High-Frequency Spintronics … , 2024 2024
Excitation of High-Frequency Short-Wavelength Spin Waves Via High Harmonics of Magnonic Cavity Mode Pawel Gruszecki, Nikhil Kumar, Mateusz Gołębiewski, Jarosław W Kłos, Maciej ... First Translational Round Table on Magnonics, High-Frequency Spintronics … , 2024 2024
Excitation of high-frequency short-wavelength spin waves N Kumar, P Gruszecki, M Gołębiewski, JW Kłos, M Krawczyk Symposium on Spintronics and Quantum Information 2024, Faculty of Physics … , 2024 2024
Exciting high-frequency short-wavelength spin waves using high harmonics of a magnonic cavity mode N Kumar, P Gruszecki, M Gołębiewski, JW Kłos, M Krawczyk arXiv preprint arXiv:2311.14143 , 2023 2023
Magnetostatic Waves in Magnonic Crystals: A PWM Approach CS Nikhil Kumar Magnonic Devices: Numerical Modelling and Micromagnetic Simulation Approach … , 2023 2023
Walker’s Solution for Curved Magnonic Waveguide and Resonant Modes in Magnonic Ring CS Nikhil Kumar Magnonic Devices: Numerical Modelling and Micromagnetic Simulation Approach … , 2023 2023
Magnetic Field Feedback Oscillator: A Micromagnetic Study CS Nikhil Kumar Magnonic Devices: Numerical Modelling and Micromagnetic Simulation Approach … , 2023 2023
Field Localization in Striped Magnonic Crystal Waveguide CS Nikhil Kumar Magnonic Devices: Numerical Modelling and Micromagnetic Simulation Approach … , 2023 2023
Backward Volume Spin Waves in a Rectangular Geometry CS Nikhil Kumar Magnonic Devices: Numerical Modelling and Micromagnetic Simulation Approach … , 2023 2023
Enhanced spin wave coupling between array of spin torque nano oscillators in magnonic crystal cavities N Kumar Physica B: Condensed Matter 645, 414248 , 2022 2022 Citations: 2
Coherent microwave generation by spintronic feedback oscillator D Kumar, K Konishi, N Kumar, S Miwa, A Fukushima, K Yakushiji, ... Scientific Reports 6 (1), 30747 , 2016 2016 Citations: 43
Spin Wave Dispersion in Striped Magnonic Waveguide N Kumar, A Prabhakar IEEE transactions on magnetics 49 (3), 1024-1028 , 2013 2013 Citations: 17
Resonant spin wave excitations in a magnonic crystal cavity N Kumar, A Prabhakar Journal of Magnetism and Magnetic Materials 450, 46-50 , 2018 2018 Citations: 13
Micromagnetic and Plane Wave Analysis of an Antidot Magnonic Crystal with a Ring Defect G Venkat, N Kumar, A Prabhakar IEEE Transactions on Magnetics 50 (11), 1-4 , 2014 2014 Citations: 9
Exciting High‐Frequency Short‐Wavelength Spin Waves using High Harmonics of a Magnonic Cavity Mode N Kumar, P Gruszecki, M Gołębiewski, JW Kłos, M Krawczyk Advanced Quantum Technologies, 7, 2400015 , 2024 2024 Citations: 4
Enhanced electrical modelling of spin transfer torque magnetic tunnel junctions with temperature dependent magnetic parameters AC Venu, N Kumar 2024 IEEE International Magnetic Conference-Short papers (INTERMAG Short … , 2024 2024 Citations: 3
An Iterative Solution for Spin-Wave Dispersion in a Magnonic Ring N Kumar, G Venkat, A Prabhakar IEEE Transactions on Magnetics 50 (9), 1-6 , 2014 2014 Citations: 3
Design and Fabrication of a Microstrip Patch Antenna Using a Flexible Low‐Dielectric, Low‐Loss Substrate A Sivan, V Muhammed Azeem, N kumar, KP Murali physica status solidi (a), e202500550 , 2025 2025 Citations: 2
Enhanced spin wave coupling between array of spin torque nano oscillators in magnonic crystal cavities N Kumar Physica B: Condensed Matter 645, 414248 , 2022 2022 Citations: 2
Phase locking, intermittency and chaos, of an array of magnon-ic crystal cavities driven by spin torque nano oscillators N Kumar, A Prabhakar 2018 IEEE International Magnetics Conference (INTERMAG), 1-1 , 2018 2018 Citations: 1
Ferroelectric-Modulated Spin to Charge Conversion and THz Emission in Bilayer WTe2 Heterostructures C. Kishandev, J. I. Joy, J. T. Korah, E. Markose and Nikhil Kumar IEEE Transactions on Magnetics, https://ieeexplore.ieee.org/document/11513274 , 2026 2026
Unprecedented dielectric minimization in polymer composite: a novel ultra‐low dielectric constant, polymer composite substrate for millimeter‐wave circuit applications Arun.N. Sathian, Nikhil Kumar and K P Murali Journal of Materials Science: Materials in Electronics 37, 1114 , 2026 2026
Terahertz Fingerprint Detection with Ultrahigh Sensitivity Using 1D Photonic Crystal Cavity Tripathi Vinayak Kumar,C S Nikhil Kumar IEEE Wireless Antenna and Microwave Symposium (WAMS) 2025, 1-5 , 2025 2025
Quasi Crystal based Circular Patch Antenna with Artificial Magnetic Conductor for Breast Cancer Detection Vishnu Priya Leena, Nikhil Kumar arXiv preprint arXiv:2502.16269 , 2025 2025
High-frequency short-wavelength spin waves in the antidot lattice generated in a nonlinear process Nikhil Kumar, Paweł Gruszecki, Mateusz Gołębiewski, Jarosław W Kłos, Maciej ... International Conference on Magnetism, Bologna, Italy , 2024 2024
Excitation Of High-Frequency Short-Wavelength Spin Waves Via High Harmonics of Magnonic Cavity Mode Nikhil Kumar, Paweł Gruszecki, Mateusz Gołębiewski, Jarosław W Kłos, Maciej ... First Translational Round Table on Magnonics, High-Frequency Spintronics … , 2024 2024
Excitation of High-Frequency Short-Wavelength Spin Waves Via High Harmonics of Magnonic Cavity Mode Pawel Gruszecki, Nikhil Kumar, Mateusz Gołębiewski, Jarosław W Kłos, Maciej ... First Translational Round Table on Magnonics, High-Frequency Spintronics … , 2024 2024
Excitation of high-frequency short-wavelength spin waves N Kumar, P Gruszecki, M Gołębiewski, JW Kłos, M Krawczyk Symposium on Spintronics and Quantum Information 2024, Faculty of Physics … , 2024 2024
Exciting high-frequency short-wavelength spin waves using high harmonics of a magnonic cavity mode N Kumar, P Gruszecki, M Gołębiewski, JW Kłos, M Krawczyk arXiv preprint arXiv:2311.14143 , 2023 2023
