Boris Vodungbo

TL;DR: This work uses femtosecond X-ray pulses from a free-electron laser to study thin film samples with magnetic domain patterns and observes an infrared-pump-induced change of the spin structure within the domain walls on the sub-picosecond timescale, demonstrating the importance of spin-dependent electron transport between differently magnetized regions as an ultrafast demagnetization channel.

TL;DR: The first single-shot images of ferromagnetic, nanoscale spin order taken with femtosecond x-ray pulses are presented, opening new ways to combine ultrafast laser spectroscopy with sequential snapshot imaging on a single sample, generating a movie of excited state dynamics.

TL;DR: Laser-induced ultrafast demagnetization in [Co/Pd](30) multilayer films is studied, which, for the first time, achieves a spatial resolution better than 100 nm by using femtosecond soft X-ray pulses.

TL;DR: In this article, the magnetization dynamics within a magnetic domain pattern after creation of a localized excitation via an optical standing wave are observed. And the experimental results show evidence of a spatial evolution of magnetization, which they attribute to ultrafast transport of nonequilibrium spin-polarized electrons for early times and to a fluence-dependent remagnetization rate for later times.

TL;DR: Results open up the way towards femtosecond time-resolved experiments using high harmonics exploiting the powerful element-sensitive XMCD effect and resolving the ultrafast magnetization dynamics of individual components in complex materials.