Observation of magnetic helicoidal dichroism with extreme ultraviolet light vortices
Mauro Fanciulli, Matteo Pancaldi, Emanuele Pedersoli, Mekha Vimal,, David Bresteau, Martin Luttmann, Dario De Angelis, Primo\v{z} Rebernik, Ribi\v{c}, Benedikt R\"osner, Christian David, Carlo Spezzani, Michele, Manfredda, Ricardo Sousa, Ioan-Lucian Prejbeanu, Laurent Vila
TL;DR
This paper reports the experimental observation of magnetic helicoidal dichroism using extreme ultraviolet vortex beams, revealing how orbital angular momentum interacts with magnetic structures, and introduces new tools for studying ultrafast magnetization dynamics.
Contribution
It provides the first experimental evidence of magnetic helicoidal dichroism with EUV vortex beams and explains its origin through electromagnetic theory, advancing magneto-optical research.
Findings
Magnetic helicoidal dichroism observed in EUV vortex beams
Interference of light modes with different orbital angular momenta explained
Framework established for ultrafast magnetization studies
Abstract
We report on the experimental evidence of magnetic helicoidal dichroism, observed in the interaction of an extreme ultraviolet vortex beam carrying orbital angular momentum with a magnetic vortex. Numerical simulations based on classical electromagnetic theory show that this dichroism is based on the interference of light modes with different orbital angular momenta, which are populated after the interaction between the light phase chirality and the magnetic topology. This observation gives insight into the interplay between orbital angular momentum and magnetism, and sets the framework for the development of new analytical tools to investigate ultrafast magnetization dynamics.
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