A5034560959- Magnetic properties of thin films
- Magnetic Properties and Applications
- Advanced Condensed Matter Physics
- Micro and Nano Robotics
- Geomagnetism and Paleomagnetism Studies
- Magnetic and transport properties of perovskites and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Pickering emulsions and particle stabilization
- Electronic and Structural Properties of Oxides
- Geophysical and Geoelectrical Methods
- Theoretical and Computational Physics
- Modular Robots and Swarm Intelligence
- Geological formations and processes
- Advanced Physical and Chemical Molecular Interactions
- Semiconductor materials and devices
- Cold Atom Physics and Bose-Einstein Condensates
- Multiferroics and related materials
- Magnetic Properties of Alloys
- Quantum and electron transport phenomena
- Additive Manufacturing and 3D Printing Technologies
- Advanced Materials and Mechanics
Max Planck Institute for Solid State Research
2023-2024
Max Planck Institute for Intelligent Systems
2018-2023
University of Cologne
2022
University of Stuttgart
2016
Abstract Conventional MEMS microactuators have, in recent years, been complemented by 3D‐printed actuatable microstructures fabricated via two‐Photon‐Polymerization (2PP). Herein, a novel compact magnetically microactuator with diameter of 500µm is demonstrated, originally designed for micro‐optical systems. It incorporating composite NdFeB microparticles and epoxy resin into designated reservoir the printed mechanical structure within simple post‐processing step. The features springs,...
First-order reversal curves (FORCs) are a powerful tool to separate microscopic coercivities and interactions in system without the need for lateral resolution. However, measured FORC densities not always straightforward interpret, especially if is interaction dominated Preisach-like interpretation of density breaks down. This why often seen as magnetic fingerprint instead measurement method yielding quantitative information. To understand additional features arising from system, we...
First-order reversal curve (FORC) measurements are a powerful tool to study magnetization processes and interactions in heterogeneous systems with broad coercivity distributions. In NdFeB hard magnets an additional soft magnetic component is often observed possibly originating from damaged surface grains. Here we use FORC the these permanent at different temperatures between 50 350 K. The measured curves reveal strongly coupled switching of components above 250 Below this temperature two...
Self-propelled particles can spontaneously form dense phases from a dilute suspension in process referred to as motility-induced phase separation. The properties of the out-of-equilibrium structures that are formed governed by specifics particle interactions and strength activity. Thus far, most studies into formation these have focused on spherical colloids, dumbbells, rod-like endowed with various interaction potentials. Only few examined collective behavior more complex shapes. Here, we...
First-order reversal-curves have proven to be an indispensable characterization tool for physics as well geology. However, the conventional evaluation algorithm requires a lot of computational effort comparable easy task overcome measurement noise. In this work, we present new approach, which exploits diversity Fourier space not only speed up calculation by factor 1000 but also move away from smoothing toward real field resolution. By comparing baseline resolution and old algorithm, are able...
Abstract Thin buried magnetic layers ranging from thicknesses of a few atomic monolayers to several nanometers are omnipresent in the fields magnetism and spintronics. For functionality fine tuning devices build with such layers, exact knowledge depth dependent properties is essential. Especially interfacial important. Hence, understanding how affected by structural variations, as thickness or interface roughness, mandatory. In this study, we use x-ray resonant reflectometry magnetometry...
Interface engineering in complex oxide superlattices is a growing field, enabling manipulation of the exceptional properties these materials, and also providing access to new phases emergent physical phenomena. Here we demonstrate how interfacial interactions can induce charge spin structure bulk paramagnetic material. We investigate superlattice (SLs) consisting LaNiO3 (LNO) highly spin-polarized ferromagnetic La2/3Ca1/3MnO3 (LCMO), grown on SrTiO3 (001) substrate. observed emerging...
Oxide heterostructures provide unique opportunities to modify the properties of quantum materials through a targeted manipulation spin, charge, and orbital states. Here, we use resonant x-ray reflectometry probe electronic structure thin slabs ${\mathrm{YVO}}_{3}$ embedded in superlattice with $\mathrm{La}\mathrm{Al}{\mathrm{O}}_{3}$. We extend previously established methods analysis general form applicable ${t}_{2g}$ electron systems extract quantitative depth-dependent linear dichroism...
A key element to tailor the properties of magnetic multilayers is coupling between individual layers. In case skyrmion hosting multilayers, skyrmions across layers highly desirable. Here interlayer was studied in epitaxial all-oxide heterostructures ferromagnetic perovskite SrRuO$_3$ separated by spacers strong spin-orbit oxide SrIrO$_3$. This combination being discussed as a potential candidate system host N\'{e}el skyrmions. First order reversal curve (FORC) measurements were performed...
Abstract Contemporary scanning laser Kerr magnetometers are very efficient measurement devices that achieve good signal to noise ratios and spatial resolution for magnetization measurements. When going beyond simple hysteresis loop measurements, large amounts of data can be acquired quickly and, thus, control software automated processing becomes necessary go these Here, we present an open source realizes first-order reversal curves magnetic property mapping based on magnetometry. The...
Self-propelled particles can spontaneously form dense phases from a dilute suspension in process referred to as motility-induced phase separation. The properties of the out-of-equilibrium structures that are formed governed by specifics particle interactions and strength activity. Thus far, most studies into formation these have focused on spherical colloids, dumbbells, rod-like endowed with various interaction potentials. Only few examined collective behavior more complex shapes. Here, we...
Magnetic multilayers with a separating insulating layer are used in multitude of functional devices. Controlling the magnetic properties such devices an electric field has potential to vastly enhance their performance. Nevertheless, experimental methods study origin electric-field-induced effects on buried interfaces remain elusive. By using element selective x-ray resonant reflectometry we able gain access changes electronic structure interfacial atoms caused by field. With this method it...
First-order reversal curves (FORC) are a powerful tool that is increasingly used in material science and nano-magnetism research [1–4]. Besides its utility for fingerprinting magnetic systems, it can distinguish between different components complex system without the need laterally resolving magnetometer [5]. Furthermore, quantitative information about intrinsic coercivities interaction fields particles be extracted from FORC measurements. Unfortunately, interpretation of diagram as Preisach...
Here, we report a novel and conceptually straightforward technique to detect the spin-polarization directly, with laser spot spatial resolution, at buried ferromagnet/insulator interfaces in ambient settings. This has been accomplished by monitoring voltage-induced change of longitudinal MOKE signal as function applied magnetic field applying an AC voltage across interface. For case where spin polarization enters VMOKE signal, simple quantitative model is proposed. A distinct positive...