A5011790332- Magnetic properties of thin films
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Theoretical and Computational Physics
- nanoparticles nucleation surface interactions
- Computational Physics and Python Applications
- Functional Brain Connectivity Studies
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Characterization and Applications of Magnetic Nanoparticles
- Hydrogen Storage and Materials
- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Neural Networks and Reservoir Computing
- Laser-Matter Interactions and Applications
- Quantum and electron transport phenomena
- Advanced MRI Techniques and Applications
- Multiferroics and related materials
- Geomagnetism and Paleomagnetism Studies
- Photorefractive and Nonlinear Optics
- Magnetic Properties of Alloys
- Spectroscopy and Quantum Chemical Studies
Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
2021-2025
University of Konstanz
2015
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...
Fluctuations and stochastic transitions are ubiquitous in nanometre-scale systems, especially the presence of disorder. However, their direct observation has so far been impeded by a seemingly fundamental, signal-limited compromise between spatial temporal resolution. Here we develop coherent correlation imaging (CCI) to overcome this dilemma. Our method begins classifying recorded camera frames Fourier space. Contrast resolution emerge averaging selectively over same-state frames. Temporal...
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....
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...
Many magnetic equilibrium states and phase transitions are characterized by fluctuations. Such fluctuation can in principle be detected with scattering-based x-ray photon correlation spectroscopy (XPCS). However, the established approach of XPCS, scattering signal is quadratic cross section, which results not only often prohibitively small signals but also a fundamental inability to detect negative correlations (anticorrelations). Here, we propose exploit possibility heterodyne mixing static...
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...
In numerous solids exhibiting broken symmetry ground states, changes in electronic (spin) structure are accompanied by structural changes. Femtosecond time-resolved techniques recently contributed many important insights into the origin of their states tracking dynamics subsystem with femtosecond light pulses. Moreover, several studies systems periodic lattice modulation (PLD) were performed. Since intensities super-lattice diffraction peaks first approximation proportional to square PLD...
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...
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...