Plasmon-driven creation of magnetic topological structures

Abstract: In the present research, we demonstrate the usage of plasmonic effects in thin film structures to control magnetic topological textures, specifically skyrmions and skyrmioniums. We investigate numerically the generation and alteration of these topological structures caused by hemisphere gold nanoparticle placed over a magnetic layer coated with a dielectric material. The electromagnetic and photothermal models are used to clarify the processes of producing heat and absorption, and the results were implemented in micromagnetic formalism to reveal the dynamics of magnetization under various conditions. Our findings demonstrate the significance of the laser pulse duration and the contact area between nanoparticles and the underlying magnetic layer in forming topological textures. In particular, we show how to generate a single skyrmion, multiple skyrmions, and skyrmioniums, and how to dynamically transition between these states. These results highlight the possibility of manipulating magnetic textures by using plasmonic effects, which presents significant opportunities for spintronics and non-conventional computer applications.