A5047204790- Magnetic properties of thin films
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Computational Physics and Python Applications
- nanoparticles nucleation surface interactions
- Characterization and Applications of Magnetic Nanoparticles
- 2D Materials and Applications
- Magnetic Properties and Applications
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- Magnetic and transport properties of perovskites and related materials
- Ion-surface interactions and analysis
- Geomagnetism and Paleomagnetism Studies
- Surface Roughness and Optical Measurements
- Metallic Glasses and Amorphous Alloys
- Semiconductor materials and devices
- Neural Networks and Reservoir Computing
- Fossil Insects in Amber
- Graphene research and applications
- Topological Materials and Phenomena
- Diamond and Carbon-based Materials Research
- Laser-induced spectroscopy and plasma
- Phase-change materials and chalcogenides
Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
2021-2025
Max Planck Institute for Intelligent Systems
2023
Laboratoire Albert Fert
2019-2022
Université Paris-Saclay
2022
Centre National de la Recherche Scientifique
2022
Magnetic skyrmions are quasiparticles with nontrivial topology, envisioned to play a key role in next-generation data technology while simultaneously attracting fundamental research interest due their emerging topological charge. In chiral magnetic multilayers, current-generated spin-orbit torques or ultrafast laser excitation can be used nucleate isolated on picosecond time scale. Both methods, however, produce randomly arranged skyrmions, which inherently limits the precision location at...
Magnetic skyrmions can be created and annihilated in ferromagnetic multilayers using single femtosecond infrared laser pulses above a material-dependent fluence threshold. From the perspective of applications, optical control offers route to faster and, potentially, more energy-efficient new class information-technology devices. Here, we investigate laser-induced skyrmion generation two different materials, mapping out dependence process on applied field fluence. We observe that sample...
Topologically non-trivial magnetic solitons are complex spin textures with a distinct single-particle nature. Although skyrmions, especially those unity topological charge, have attracted substantial interest due to their potential applications, more remain largely theoretical. In this work, the stabilization of isolated higher-order skyrmion bags beyond prototypical π-skyrmion in ferromagnetic thin films is experimentally demonstrate, which has posed considerable challenges date....
Focused beams of helium ions are a powerful tool for high-fidelity machining with spatial precision below 5 nm. Achieving such high patterning over large areas and different materials in reproducible manner, however, is not trivial. Here, we introduce the Python toolbox FIB-o-mat automated pattern creation optimization, providing full flexibility to accomplish demanding tasks. offers high-level creation, enabling large-area systematic variations geometry raster settings. It also low-level...
A single laser pulse can create nanometer-scale magnetic skyrmions in a thin film ferromagnet. However, the appear randomly distributed within excited area hampering application of process. Here, authors present reliable approach to gain nanometer spatial control over skyrmions' positions: reflective masks fabricated on material's backside locally affect optical excitation amplitudes reached. The precisely define preferred and inhibited regions for skyrmion nucleation while maintaining...
We demonstrate a stabilized black phosphorus (BP) 2D platform thanks to an ultrathin MgO barrier, as required for spintronic device integration. The in-situ layer deposition is achieved by using large-scale atomic process with high nucleation density. Raman spectroscopy studies show that this protects the BP from degradation in ambient conditions, unlocking particular possibility carry out usual lithographic fabrication steps. resulting MgO/BP stack then integrated and probed electrically,...
Soft x-ray microscopy plays an important role in modern spintronics. However, the achievable resolution of most magnetic imaging experiments limits access to fundamental and technologically relevant length scales sub-10 nm regime. Here, we demonstrate with 5 by combining holography-assisted coherent diffractive heterodyne amplification weak signal. The gain contrast makes pinning sites visible allows measure local width domain walls. ability detect map such properties photons opens new...
2D materials offer the ability to expose their electronic structure manipulations by a proximity effect. This could be harnessed craft properties of interfaces and van der Waals heterostructures in devices quantum materials. We explore possibility create an artificial spin polarized electrode from graphene through interaction with ferromagnetic insulator used magnetic tunnel junction (MTJ). Ferromagnetic insulator/graphene electrodes were fabricated integrated MTJs based on analyzers....
We present time-resolved scanning x-ray microscopy measurements with picosecond photo-excitation via a tailored infrared pump laser at transmission microscope. Specifically, we image the laser-induced demagnetization and remagnetization of thin ferrimagnetic GdFe films proceeding on few nanoseconds timescale. Controlling heat load sample additional reflector heatsink layers allows us to conduct destruction-free repetition rate 50 MHz. Near-field enhancement controlled annealing effects lead...
Spin-orbit torques (SOTs) act as efficient drivers for nanoscale magnetic systems, such in tunnel junctions, nano-oscillators and racetrack geometries. In particular, combination with materials exhibiting high Dzyaloshinskii--Moriya interaction, SOTs are considered to result well-controlled deterministic magnetisation dynamics are, therefore, used robust drives move create skyrmions. contrast these expectations, we here find unpredictable, transiently chaotic induced by SOT at an artificial...
Soft x-ray microscopy plays an important role in modern spintronics. However, the achievable resolution of most magnetic imaging experiments is above 10 nm, limiting access to fundamental and technologically relevant length scales. Here, we demonstrate with 5 nm by combining holography-assisted coherent diffractive heterodyne amplification weak signal. The gain contrast allows direct key properties, including domain wall profiles position pinning sites. ability detect map such properties...
In ferromagnetic multilayers, a single laser pulse with fluence above an optical nucleation threshold can create magnetic skyrmions, which are randomly distributed over the area of spot. However, in order to study dynamics skyrmions and for their application future data technology, controllable localization skyrmion sites is crucial. Here, it demonstrated that patterned reflective masks behind thin film be designed locally tailor excitation amplitudes reached, leading spatially controlled on...
We present time-resolved scanning x-ray microscopy measurements with picosecond photo-excitation via a tailored infrared pump laser at transmission microscope. Specifically, we image the laser-induced demagnetization and remagnetization of thin ferrimagnetic GdFe films proceeding on few nanoseconds time scale. Controlling heat load sample additional reflector heat-sink layers allows us to conduct destruction-free repetition rate \SI{50}{\mega\hertz}. Near-field enhancement controlled...
The recently discovered topological fluctuation state provides a fascinating new perspective on the ultrafast emergence of topology in condensed matter systems. However, rather little is known about physics this and origin fluctuations. Using time-resolved small-angle x-ray scattering, we observe that states appear after laser excitation even if final does not host stable skyrmions. Simulations support these findings reveal fluctuations originate from competition between spontaneous...