Nikhil Kumar C S

I graduated with my Master of Science by Research in, Electrical Engineering, IIT Madras in 2014 with a thesis titled Analytical models for magnonic devices and with my Doctor of Philosophy in Electrical Engineering, IIT Madras in 2020 with a thesis titled Magnonic Devices with Feedback Stabilization under the guidance of Prof. Anil Prabhakar, Department of Electrical Engineering, IIT Madras.

EDUCATION

I graduated with my Master of Science by Research in, Electrical Engineering, IIT Madras in 2014 with a thesis titled Analytical models for magnonic devices and with my Doctor of Philosophy in Electrical Engineering, IIT Madras in 2020 with a thesis titled Magnonic Devices with Feedback Stabilization under the guidance of Prof. Anil Prabhakar, Department of Electrical Engineering, IIT Madras.

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
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.
Preface
Springerbriefs in Materials, 2023
Introduction
C. S. Nikhil Kumar
Springerbriefs in Materials, 2023
Magnetostatic Waves in Magnonic Crystals: A PWM Approach
C. S. Nikhil Kumar
Springerbriefs in Materials, 2023
Backward Volume Spin Waves in a Rectangular Geometry
C. S. Nikhil Kumar
Springerbriefs in Materials, 2023
Nanocontact-Driven Spin Wave Excitations in Magnonic Cavity
C. S. Nikhil Kumar
Springerbriefs in Materials, 2023
Field Localization in Striped Magnonic Crystal Waveguide
C. S. Nikhil Kumar
Springerbriefs in Materials, 2023
Walker’s Solution for Curved Magnonic Waveguide and Resonant Modes in Magnonic Ring
C. S. Nikhil Kumar
Springerbriefs in Materials, 2023
Magnetic Field Feedback Oscillator: A Micromagnetic Study
C. S. Nikhil Kumar
Springerbriefs in Materials, 2023
Enhanced spin wave coupling between array of spin torque nano oscillators in magnonic crystal cavities
Nikhil Kumar
Physica B Condensed Matter, 2022
Spin-Wave Excitation Patterns Generated by Spin-Torque Nano-Oscillators
C. S. Nikhil Kumar
Springerbriefs in Applied Sciences and Technology, 2022
Magnonic Spectra in 2D Antidot Magnonic Crystals with Line Defect
C. S. Nikhil Kumar
Springerbriefs in Applied Sciences and Technology, 2022
Introduction
C. S. Nikhil Kumar
Springerbriefs in Applied Sciences and Technology, 2022
Summary and Future Work
C. S. Nikhil Kumar
Springerbriefs in Applied Sciences and Technology, 2022
Sustaining Spin-Wave Oscillations Through Internal Feedback
C. S. Nikhil Kumar
Springerbriefs in Applied Sciences and Technology, 2022
Coherent Spin-Wave Oscillations Through External Feedback
C. S. Nikhil Kumar
Springerbriefs in Applied Sciences and Technology, 2022
Resonant spin wave excitations in a magnonic crystal cavity
N. Kumar, A. Prabhakar
Journal of Magnetism and Magnetic Materials, 2018
Coherent microwave generation by spintronic feedback oscillator
D. Kumar, K. Konishi, N. Kumar, S. Miwa, A. Fukushima, et al.
Scientific Reports, 2016
Micromagnetic and plane wave analysis of an antidot magnonic crystal with a ring defect
G. Venkat, N. Kumar, A. Prabhakar
IEEE Transactions on Magnetics, 2014
An iterative solution for spin-wave dispersion in a magnonic ring
N. Kumar, G. Venkat, A. Prabhakar
IEEE Transactions on Magnetics, 2014
Spin wave dispersion in striped magnonic waveguide
N. Kumar, A. Prabhakar
IEEE Transactions on Magnetics, 2013