Nanoscale Magnetic Imaging using Circularly Polarized High-Harmonic Radiation

TL;DR

This paper presents a method for nanoscale magnetic imaging using circularly polarized high-harmonic radiation, achieving high resolution and enabling detailed studies of ultrafast magnetization dynamics.

Contribution

It introduces a lensless imaging technique with high spatial resolution using high-harmonic radiation for magnetic domain visualization.

Findings

Achieved 49 nm spatial resolution in magnetic imaging.

Demonstrated quantitative amplitude and phase mapping of magnetic domains.

Utilized coherence of high harmonics for element-specific studies.

Abstract

This work demonstrates nanoscale magnetic imaging using bright circularly polarized high-harmonic radiation. We utilize the magneto-optical contrast of worm-like magnetic domains in a Co/Pd multilayer structure, obtaining quantitative amplitude and phase maps by lensless imaging. A diffraction-limited spatial resolution of 49 nm is achieved with iterative phase reconstruction enhanced by a holographic mask. Harnessing the unique coherence of high harmonics, this approach will facilitate quantitative, element-specific and spatially-resolved studies of ultrafast magnetization dynamics, advancing both fundamental and applied aspects of nanoscale magnetism.