<研究ノート>FeGeナノ粒子中に捕捉されたskyrmionの実空間観察

Abstract

Magnetic skyrmion is an exotic vortex-like magnetic structure stabilized by the Dzyaloshinskii-Moriya interaction in chiral-lattice helimagnets. This magnetic-phase object is one of the most favored products with an extremely low critical current density for driving their motion and have recently been captured in association with significant advancements in magnetic imaging techniques. On the other hand, their intrinsic stability in three-dimensions remains elusive due to technical difficulties. Consequently, their robustness in threedimensions is not fully understood, while they have been intensively studied in two- and one-dimensions. In this study, we identify the topologically non-trivial magnetic structures in skyrmion-hosting FeGe nanoparticles via tomographic electron holography. The electron holography observations from multiple projections hold an exclusive advantage in visualizing three-dimensional forms of magnetic structures confined in nanoparticles.