A5052653649- Magnetic properties of thin films
- Surface and Thin Film Phenomena
- Multiferroics and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Properties and Synthesis of Ferrites
- Magnetic Properties and Applications
- Semiconductor materials and devices
- Physics of Superconductivity and Magnetism
- Graphene research and applications
- Electron and X-Ray Spectroscopy Techniques
- Theoretical and Computational Physics
- ZnO doping and properties
- Iron oxide chemistry and applications
- 2D Materials and Applications
- Electronic and Structural Properties of Oxides
- Semiconductor materials and interfaces
- Anodic Oxide Films and Nanostructures
- Advanced Chemical Physics Studies
- Magnetic and transport properties of perovskites and related materials
- nanoparticles nucleation surface interactions
- Topological Materials and Phenomena
- Advanced Electron Microscopy Techniques and Applications
- Ga2O3 and related materials
- Catalytic Processes in Materials Science
- Acoustic Wave Resonator Technologies
ALBA Synchrotron (Spain)
2016-2025
FC Barcelona
2018-2020
Centre for Research on Ecology and Forestry Applications
2020
New York University Press
2018
MicroVision (United States)
2018
Elettra-Sincrotrone Trieste S.C.p.A.
2004-2009
Universitat Autònoma de Barcelona
2008
AREA Science Park
2004-2007
Lawrence Berkeley National Laboratory
2007
University of California, Berkeley
2007
Magnetic skyrmions are deemed to be the forerunners of novel spintronic memory and logic devices. While their observation current-driven motion at room temperature have been demonstrated, certain issues regarding nucleation, stability, pinning, skyrmion Hall effect still need overcome realize functional Here, we demonstrate that focused He+-ion-irradiation can used create guide in racetracks. We show reduction perpendicular magnetic anisotropy Dzyaloshinskii–Moriya interaction track defined...
Abstract The instrumentation for synchrotron radiation X‐ray photoemission electron microscopy (XPEEM) has recently undergone significant improvements, finding application in diverse fields such as magnetism, chemistry, surface science and nanostructure characterization. spectroscopic low energy microscope (SPELEEM) operational at the ‘Nanospectroscopy beamline’ Elettra facility combines structural analysis methods a single instrument, exploiting inherent chemical sensitivity of X rays....
The current-driven motion of magnetic skyrmions is an essential functionality for next-generation memory and logic devices. This paper provides a complete, detailed experimental study model system composed ultrathin Pt/Co/MgO film, in which 100-nm move at high speeds 100 m/s exhibit velocity-dependent skyrmion Hall effect. Detailed characterization the film properties using experiment, analytical modeling, micromagnetic simulation reveals that this behavior can be fully accounted by pinning...
Abstract The fabrication of van der Waals heterostructures, artificial materials assembled by individual stacking 2D layers, is among the most promising directions in research. Until now, widespread approach to stack layers relies on deterministic placement methods, which are cumbersome and tend suffer from poor control over lattice orientations presence unwanted interlayer adsorbates. Here, we present a different fabricate ultrathin heterostructures exfoliation bulk franckeite naturally...
We report on the large-scale synthesis of highly oriented ultrathin MoO3 layers using a simple and low-cost atmospheric pressure by van der Waals epitaxy growth muscovite mica substrates. By this method we are able to synthetize high quality centimeter-scale crystals with thicknesses ranging from 1.4 nm (two layers) up few nanometers. The can be easily transferred an arbitrary substrate (such as SiO2) deterministic transfer extensively characterized demonstrate resulting crystal. also study...
The spectroscopic LEEM-PEEM experimental station at the CIRCE helical undulator beamline, which started user operation ALBA Synchrotron Light Facility in 2012, is presented. This station, based on an Elmitec LEEM III microscope with electron imaging energy analyzer, permits surfaces to be imaged chemical, structural and magnetic sensitivity down a lateral spatial resolution better than 20 nm X-ray excited photoelectrons 10 UV-PEEM modes. Rotation around surface normal application of electric...
The recent discovery of magnetic van der Waals (vdW) materials triggered a wealth investigations in science and now offers genuinely new prospects for both fundamental applied research. Although the catalog vdW ferromagnets is rapidly expanding, most them have Curie temperature below 300 K, notable disadvantage potential applications. Combining element-selective X-ray imaging force microscopy, we resolve at room domains domain walls micron-sized flakes CrTe2 ferromagnet. Flux-closure...
Magnetic skyrmions are topological spin textures that hold great promise as nanoscale information carriers in non-volatile memory and logic devices. While room-temperature magnetic their current-induced manipulation were recently demonstrated, the stray field resulting from finite magnetization well charge limit minimum size reliable motion tracks. Antiferromagnetic (AF) allow these limitations to be lifted owing vanishing net zero charge, promising room-temperature, ultrasmall skyrmions,...
The effect of electron quantum confinement on the surface reactivity ultrathin metal films is explored by comparing initial oxidation rate atomically flat magnesium different thickness, using complementary microscopy techniques. Pronounced thickness-dependent variations in are observed for well ordered up to 15 atomic layers. Quantitative comparison reveals direct correlation between and periodic changes density electronic states induced quantum-well crossing Fermi level.
The magnetoelastic effect-the change of magnetic properties caused by the elastic deformation a material-has been proposed as an alternative approach to fields for low-power control magnetization states nanoelements since it avoids charge currents, which entail ohmic losses. Here, we have studied effect dynamic strain accompanying surface acoustic wave on nanostructures in thermal equilibrium. We developed experimental technique based stroboscopic X-ray microscopy that provides pathway...
The unidirectional motion of information carriers such as domain walls in magnetic nanostrips is a key feature for many future spintronic applications based on shift registers. This ratchet effect has so far been achieved limited number complex nanomagnetic structures, example, by lithographically engineered pinning sites. Here we report simple remagnetization originated the asymmetric potential from designed increasing lengths magnetostatically coupled ferromagnetic segments FeCo/Cu...
Using hybrid piezoelectric-magnetic systems we have generated large amplitude magnetization waves mediated by magnetoelasticity with up to 25 degrees variation in the orientation. We present direct imaging and quantification of both standing propagating acoustomagnetic different wavelengths, over distances several millimeters a nickel thin film.Received 2 January 2020Accepted 5 March 2020DOI:https://doi.org/10.1103/PhysRevLett.124.137202© 2020 American Physical SocietyPhysics Subject...
While the usual approach to tailor behavior of condensed matter and nanosized systems is choice material or finite-size interfacial effects, topology alone may be key. In context motion magnetic domain walls (DWs), known suffer from dynamic instabilities with low mobilities, we report unprecedented velocities $>600\text{ }\text{ }\mathrm{m}/\mathrm{s}$ for DWs driven by spin-transfer torques in cylindrical nanowires made a standard ferromagnetic material. The reason robust stabilization...
Abstract Emergent behaviors occur when simple interactions between a system's constituent elements produce properties that the individual do not exhibit in isolation. This article reports tunable emergent observed domain wall (DW) populations of arrays interconnected magnetic ring‐shaped nanowires under an applied rotating field. DWs interact stochastically at ring junctions to create mechanisms DW population loss and gain. These combine give dynamic, field‐dependent equilibrium is robust...
The effective superparamagnetic behaviour in IONF is caused by the near demagnetized state driven high vorticity of core moment texture at low magnetic fields.
We report observations of the effect electrical currents on propagation and spin structure vortex walls in NiFe wires. find that magnetic vortices are nucleated annihilated due to torque effect. The velocity is found be directly correlated with these transformations decreases increasing number vortices. observed wide elements, while narrower structures single prevails.
The surface and the internal magnetic structure of bamboo-like cylindrical nanowires with tailored diameter modulations have been determined by XMCD/PEEM MFM.
Cylindrical nanowires made of soft magnetic materials, in contrast to thin strips, may host domain walls two distinct topologies. Unexpectedly, we evidence experimentally the dynamic transformation topology upon wall motion above a field threshold. Micromagnetic simulations highlight underlying precessional dynamics for one way transformation, involving nucleation Bloch-point singularity, however, fail reproduce reverse process. This rare discrepancy between micromagnetic and experiments...
Abstract Platelets of strontium hexaferrite (SrFe 12 O 19 , SFO), up to several micrometers in width, and tens nanometers thick have been synthesized by a hydrothermal method. They studied combination structural magnetic techniques, with emphasis on Mössbauer spectroscopy X-ray absorption based-measurements including microscopy the iron-L edges oxygen-K edge, allowing us establish differences similarities between our nanostructures commercial powders. The spectra reveal greater contribution...
Metal halides are a class of layered materials with promising electronic and magnetic properties persisting down to the two-dimensional limit. While most recent studies focused on trihalide components this family, rather unexplored metal dihalides also van der Waals systems distinctive properties. Here we show that dihalide NiBr
Electrodeposited nanowires are an excellent scenario to study and control magnetic domain wall motion in nanostructures. In particular, the introduction of local changes composition during growth procedure has been proven be very efficient for controlling magnetization dynamics. this work, we show possibility introducing compositional gradients FeNi electrodeposited by gradually changing Fe/Ni ratio along their axis. These produce asymmetrical landscape which is reflected processes under...
Bilayers of NdCo5/Ni8Fe2 can act as reconfigurable racetracks thanks to the parallel stripe-domain configuration present in hard magnetic material with weak perpendicular anisotropy (NdCo5), and its imprint on soft layer (Ni8Fe2). This pattern hosts domain walls well-defined vortex-antivortex configurations establishes paths for their deterministic propagation under effect pulsed currents. Magnetic transmission x-ray microscopy experiments show guided domain-wall events within Ni8Fe2 above a...