Karl Franzens University Graz | Graz University of Technology |
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Following complex spin structures in time and space Controlling ultrafast spin dynamics directly on the quantum level by femtosecond light pulses promises a dramatic increase in speed, energy efficiency, and density of how we transport, process, and store information. Recent advances in the field have enabled an understanding of laser-driven spin dynamics from microscopic processes toward macroscopic functionality in magnetic nanostructures, including charge and spin transport as well as interactions with spatially extended quasiparticles such as phonons and magnons. These processes generally lead to a nanoscale spatial rearrangement of magnetization, calling for experimental techniques that can directly access the ultrafast evolution of spatially inhomogeneous spin profiles and detect the transfer or accumulation of spins at interfaces. Such observables providing nanometer spatial and femto- to picosecond temporal resolution are particularly required for investigations of complex heterostructures and non-collinear antiferromagnets, where competing interactions result in a variety of complex spin structures already in equilibrium. |