Abstract
Novel time-resolved imaging techniques for the investigation of ultrafast nanoscale magnetization dynamics are indispensable for further developments in light-controlled magnetism. Here, we introduce femtosecond Lorentz microscopy, achieving a spatial resolution below 100 nm and a temporal resolution of 700 fs, which gives access to the transiently excited state of the spin system on femtosecond timescales and its subsequent relaxation dynamics. We demonstrate the capabilities of this technique by spatio-temporally mapping the light-induced demagnetization of a single magnetic vortex structure and quantitatively extracting the evolution of the magnetization field after optical excitation. Tunable electron imaging conditions allow for an optimization of spatial resolution or field sensitivity, enabling future investigations of ultrafast internal dynamics of magnetic topological defects on 10-nanometer length scales.
Highlights
Being a key aspect for future processing and storage applications, strategies for the manipulation of nanoscale magnetic domains and topological defects were recently developed utilizing various stimuli such as electrical current [1,2,3,4,5] and light [6,7,8,9,10,11]
Novel time-resolved imaging techniques for the investigation of ultrafast nanoscale magnetization dynamics are indispensable for further developments in light-controlled magnetism
We demonstrate the capabilities of this technique by spatiotemporally mapping the light-induced demagnetization of a single magnetic vortex structure and quantitatively extracting the evolution of the magnetization field after optical excitation
Summary
Being a key aspect for future processing and storage applications, strategies for the manipulation of nanoscale magnetic domains and topological defects were recently developed utilizing various stimuli such as electrical current [1,2,3,4,5] and light [6,7,8,9,10,11]. Nanoscale Mapping of Ultrafast Magnetization Dynamics with Femtosecond Lorentz Microscopy Tunable electron imaging conditions allow for an optimization of spatial resolution or field sensitivity, enabling future investigations of ultrafast internal dynamics of magnetic topological defects on a 10 nm length scale.
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