Abstract
We demonstrate for the first time the realization of a spatial resolved two color, element-specific imaging experiment at the free-electron laser facility FERMI. Coherent imaging using Fourier transform holography was used to achieve direct real space access to the nanometer length scale of magnetic domains of Co/Pt heterostructures via the element-specific magnetic dichroism in the extreme ultraviolet spectral range. As a first step to implement this technique for studies of ultrafast phenomena we present the spatially resolved response of magnetic domains upon femtosecond laser excitation.
Highlights
U LTRATHIN perpendicularly magnetized heterostructures, such as the two-compound multilayer system Co/Pt, show fascinating physical properties due to strong spin-orbit coupling [1]
Co/Pt multilayers have a significant interface contribution to the perpendicular magnetic anisotropy which can be used for the control of domain wall motion arising from an interplay of Dzyaloshinskii–Moriya interaction [2], [3] at the Co/Pt interfaces and spin currents [4]
We present the first experimental demonstration of two-color imaging with Fourier transform holography (FTH) in the extreme ultraviolet (XUV) spectral range measured at the free-electron laser (FEL) facility FERMI in Trieste, Italy
Summary
U LTRATHIN perpendicularly magnetized heterostructures, such as the two-compound multilayer system Co/Pt, show fascinating physical properties due to strong spin-orbit coupling [1]. Co/Pt multilayers have a significant interface contribution to the perpendicular magnetic anisotropy which can be used for the control of domain wall motion arising from an interplay of Dzyaloshinskii–Moriya interaction [2], [3] at the Co/Pt interfaces and spin currents [4]. Based on these mechanisms room-temperature skyrmions can be created in thin Co/Pt films in racetrack memories [5]. The feasibility and the prospect of combining both, multi-color spectroscopy with nanometer resolution and femtosecond spatial resolution are discussed
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