High Spatiotemporal Resolution of Magnetic Dynamics in Mn - Ni - Ga via Four-Dimensional Lorentz Microscopy

Abstract

The interaction of laser pulses with magnetic materials has become a major topic in modern magnetism, with ultrashort pulses providing unique windows to view ultrafast phenomena. It is still a challenge, though, to extend spatial resolution, to study magnetic nanostructures and complex spin textures. Here the high spatiotemporal resolution of Lorentz ultrafast transmission electron microscopy (Lorentz UTEM) reveals remarkable features and key details of the magnetic transient states in Mn-Ni-Ga after a femtosecond laser pulse. This work showcases Lorentz UTEM as a means of directly imaging ultrafast magnetization phenomena at the nanoscale.