Marcel Möller

University of Göttingen

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Claus Ropers

University of Göttingen

Armin Feist

Max Planck Institute for Dynamics and Self-Organization

Sascha Schäfer

University of Regensburg

John H. Gaida

Max Planck Institute for Multidisciplinary Sciences

Nara Rubiano da Silva

Universidade Federal de Santa Catarina

Sergey Zayko

Max Planck Institute for Multidisciplinary Sciences

Till Domröse

University of Göttingen

Ofer Kfir

University of Göttingen

Daniel Steil

University of Göttingen

M. Albrecht

University of Augsburg

Cooperative Institutions

University of Göttingen

European X-Ray Free-Electron Laser

Max Planck Institute for Multidisciplinary Sciences

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Max Planck Institute for Dynamics and Self-Organization

Deutsches Elektronen-Synchrotron DESY

Centre National de la Recherche Scientifique

Universität Hamburg

Max Planck Institute for Biophysical Chemistry

Massachusetts Institute of Technology

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Data and code for Observation of fluctuation-mediated picosecond nucleation of a topological phase

Zenodo (CERN European Organization for Nuclear Research) (2020)

Felix Büttner Bastian Pfau Marie Böttcher Michael Schneider Giuseppe Mercurio

Data and code to generate the figures in the main text and supplementary information of our article.

Picosecond

Code (set theory)

10.5281/zenodo.3827320

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Data and code for Observation of fluctuation-mediated picosecond nucleation of a topological phase

Zenodo (CERN European Organization for Nuclear Research) (2020)

Felix Büttner Bastian Pfau Marie Böttcher Michael Schneider Giuseppe Mercurio

Data and code to generate the figures in the main text and supplementary information of our article.

Picosecond

Code (set theory)

10.5281/zenodo.4017322

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Femtosecond Lorentz Microscopy for the Mapping of Ultrafast Magnetization Dynamics

Microscopy and Microanalysis (2019)

Nara Rubiano da Silva Marcel Möller Armin Feist Henning Ulrichs Claus Ropers

Magnetization dynamics

Dynamics

10.1017/s1431927619000928

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Laser‐Induced Real‐Space Topology Control of Spin Wave Resonances

Advanced Functional Materials (2024)

Tim Titze Sabri Koraltan Timo Torsten Schmidt Marcel Möller Florian Bruckner

Abstract Femtosecond laser excitation of materials exhibiting magnetic spin textures promises advanced magnetic control via the generation of non‐equilibrium spin dynamics. Ferrimagnetic [Fe(0.35 nm)/Gd(0.40 nm)] 160 multilayers are used to explore this approach, as they host a rich diversity of magnetic textures from stripe domains at low magnetic fields, a dense bubble/skyrmion lattice at intermediate fields, and a single domain state for high magnetic fields. Using femtosecond magneto‐optics, distinct coherent spin wave dynamics are observed in this material in response to a weak laser excitation, enabling an unambiguous identification of the different magnetic spin textures. Moreover, employing strong laser excitation, versatile control of the coherent spin dynamics via non‐equilibrium transformation of magnetic spin textures becomes possible by both creating and annihilating bubbles/skyrmions. Micromagnetic simulations and Lorentz transmission electron microscopy with in situ optical excitation corroborate these findings.

10.1002/adfm.202313619

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Nanoscale Magnetic Imaging using Circularly Polarized High-Harmonic Radiation

arXiv (Cornell University) (2017)

Ofer Kfir Sergey Zayko Christina Nolte Murat Sivis Marcel Möller

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.

Magnetism

Harmonic

10.48550/arxiv.1706.07695

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Citations (1)

Rudolf Haindl Armin Feist Till Domröse Marcel Möller John H. Gaida

Correlations between electrons are at the core of numerous phenomena in atomic, molecular, and solid-state systems. Harnessing free-particle correlations remains challenging, with the recent implementation of nanoscale single-electron sources [1] and observation of weak anti-bunching in electron beams [2], [3]. A powerful approach to induce strong electron-electron interactions is femtosecond-triggered photoemission from nanotips [4], [5] with high spatial and temporal confinement. However, ensemble-averaged detection typically conceals few-body effects.

Inverse photoemission spectroscopy

10.1109/cleo/europe-eqec57999.2023.10231669

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Optically induced nanoscale networks of topological magnetic defects

International Conference on Ultrafast Phenomena (2016)

Tim Eggebrecht Marcel Möller J. Gregor Gatzmann Nara Rubiano da Silva Armin Feist

Lorentz microscopy with in-situ femtosecond laser excitation allows for the investigation of optically triggered magnetic processes with nanometer spatial resolution. Here, we demonstrate the light-induced formation of nanoscale magnetic vortex-antivortex networks in thin iron layers.

Optical vortex

Nanometre

10.1364/up.2016.uth4a.44

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Pinning and gyration dynamics of magnetic vortices revealed by correlative Lorentz and bright-field imaging

arXiv (Cornell University) (2021)

Marcel Möller John H. Gaida Claus Ropers

Topological magnetic textures are of great interest in various scientific and technological fields. To allow for precise control of nanoscale magnetism, it is of great importance to understand the role of intrinsic defects in the host material. Here, we use conventional and time-resolved Lorentz microscopy to study the effect of grain size in polycrystalline permalloy films on the pinning and gyration orbits of vortex cores inside magnetic nanoislands. To assess static pinning, we use in-plane magnetic fields to shift the core across the island while recording its position. This enables us to produce highly accurate two-dimensional maps of pinning sites. Based on this technique, we can generate a quantitative map of the pinning potential for the core, which we identify as being governed by grain boundaries. Furthermore, we investigate the effects of pinning on the dynamic behavior of the vortex core using stroboscopic Lorentz microscopy, harnessing a new photoemission source that accelerates image acquisition by about two orders of magnitude. We find characteristic changes to the vortex gyration in the form of increased dissipation and enhanced bistability in samples with larger grains.

Gyration

Permalloy

Magnetism

Lorentz force

10.48550/arxiv.2107.10208

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Imaging Magnetic Dynamics with In Situ and Ultrafast Lorentz Transmission Electron Microscopy

Bulletin of the American Physical Society (2018)

Tyler R. Harvey Nara Rubiano da Silva Marcel Möller John H. Gaida Armin Feist

Dynamics

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