# Nanoscale Magnetic Imaging using Circularly Polarized High-Harmonic Radiation **Authors:** Ofer Kfir (1, 2), Sergey Zayko (1), Christina Nolte (3), Murat, Sivis (1), Marcel M\"oller (1), Birgit Hebler (4), Sri Sai Phani Kanth, Arekapudi (4), Daniel Steil (3), Sascha Sch\"afer (1), Manfred Albrecht (4),, Oren Cohen (2), Stefan Mathias (3), and Claus Ropers (1, 5) ((1), University of G\"ottingen, 4th Physical Institute, G\"ottingen, Germany, (2), Technion - Israel Institute of Technology, Solid State Institute, Physics, Department, Haifa, Israel, (3) University of G\"ottingen, 1st Physical, Institute, G\"ottingen, Germany, (4) University of Augsburg, Institute of, Physics, Augsburg, Germany, (5) International Center for Advanced Studies of, Energy Conversion (ICASEC), University of G\"ottingen, Germany) arXiv: 1706.07695 ยท 2017-06-26 ## 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. ## Key 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. --- Source: https://tomesphere.com/paper/1706.07695