Research Projects

Magnetic skyrmions are topologically protected spin textures and nanosized particle like spin configurations with a whirling configuration, which are characterised by their finite topological winding number, extraordinary stability and long life time. Magnetic skyrmion spin texture results from a balance between exchange coupling, the Dzyaloshinskii-Moriya (DM) interaction, and the Zeeman energy from the applied field, that have been observed experimentally in various magnetic materials, in both bulk systems and thin magnetic layers. The controllable nucleation and motion of skyrmions in magnetic nanostructures have been intensively explored which will be essential in the future skyrmion spintronic devices and logic applications. To realize skyrmion-based spintronic devices, it is essential to understand skyrmion motions in the confined geometries. In this project we wish to propose and investigate the skyrmion dynamics in different constricted ferromagnetic nanostructures. The proposal of our study on the dynamics of skyrmion in ferromagnetic nanostructures is divided into three parts. In the first part, we are going to study the geometrical and material parameters of a spin valve structure and investigate the favourable conditions for nucleation and annihilation of skyrmion formation and extend our study to investigate the current driven switching dynamics of skyrmion in the spin valve structure and essentially the role of magnetic interface coupling and magnetic interface anisotropy on the switching dynamics to be investigate. In the second part, we wish to propose and study the skyrmion magnonic crystal based on a perpendicularly magnetized metal/ultra-thin ferromagnet bilayer waveguide with a perpendicular magnetic anisotropy, and with interface DM interactions. Analyze the conditions on the external and material parameters to obtain single controllable magnonic band gap in the skyrmion based magnonic crystal. In the third part, we extend our studies in skyrmion based magnonic crystal and investigate high sensitivity based on magnonic sensors for the measurement of weak magnetic fields at room temperature. Mainly we focus and investigate on the surface modulation, band structure, and magnetic field sensing capacity in detail and especially nature of frequency shift in the band gap with increasing bias field to be investigate. Finally our study is extend to an another platform to understand the effect of dynamically control lattice properties on the nature of nonlinear localized magnetic excitation of skyrmion based dynamic magnonic crystal. Project is mainly focus on the skyrmion dynamics in different ferromagnetic nanostructures and spintronic applications. As an outcome of the project, we hope that the conclusions will add up to the body of nowledge in the emerging field of magnetic skyrmions.