A5012167049- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Multiferroics and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Properties and Applications
- Theoretical and Computational Physics
- Photonic Crystals and Applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Magnetic Properties of Alloys
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Force Microscopy Techniques and Applications
- Electromagnetic wave absorption materials
- Ferroelectric and Piezoelectric Materials
- Neural Networks and Reservoir Computing
- Metamaterials and Metasurfaces Applications
- Geophysics and Sensor Technology
- Nonlinear Dynamics and Pattern Formation
- Magnetic Field Sensors Techniques
- Electric Power Systems and Control
- Random lasers and scattering media
- Optical Polarization and Ellipsometry
- Advanced Decision-Making Techniques
University of Perugia
2015-2024
Istituto Nazionale di Ricerca Metrologica
2020-2021
Istituto Officina dei Materiali
2017-2020
Abstract Magnonics is gaining momentum as an emerging technology for information processing. The wave character and Joule heating-free propagation of spin-waves hold promises highly efficient computing platforms, based on integrated magnonic circuits. realization such nanoscale circuitry crucial, although extremely challenging due to the difficulty tailoring nanoscopic magnetic properties with conventional approaches. Here we experimentally realize a reconfigurable spin-wave by using...
Abstract Integrated optically inspired wave‐based processing is envisioned to outperform digital architectures in specific tasks, such as image and speech recognition. In this view, spin waves represent a promising route due their nanoscale wavelength the gigahertz frequency range rich phenomenology. Here, versatile, platform using realized, demonstrating wavefront engineering, focusing, robust interference of with wavelength. particular, magnonic nanoantennas based on tailored textures are...
In the race towards "beyond 6G" telecommunication platforms, magnonics emerges as a promising solution due to its wide tunability within FR3 band (7-24 GHz). So far, however, need for an external magnetic bias field allow coherent excitation of spin waves has been major bottleneck. Conventional bulky electromagnets are power-intensive and challenging integrate on-chip, restricting magnonic applications largely academic research. Here, we present first demonstration standalone, tunable device...
Stuck in the middle with you: The spin-wave mode localized contact area among macrospins an artificial spin ice (ASI) is interesting for magnonic devices and applications. Detection characterization of this difficult, though. This study uses carefully designed lattices individual right aspect ratio nanoelements, geometry on ASI vertex, configuration clear detection dynamics. found to exhibit a peculiar sensitivity applied field's direction, which could impact applications such as position...
Spin waves propagation in ferromagnetic films, several tens of nanometers thick, have recently received increasing attention, view the development magnonic devices operating GHz range frequencies. A detailed knowledge dispersion curves and spatial characteristics spin-wave modes is preliminary to any technological application, particularly ``mesoscopic range'' (50--200 nm) film thickness, where dipole-exchange may appear spectrum, exhibiting frequency crossing hybridization as a function...
We have investigated both experimentally and numerically the magnonic band structure of arrays closely spaced Fe/permalloy nanowires (NWs) with an L-shape cross-section using Brillouin light scattering technique GPU-based micromagnetic simulations. NWs consist a 340 nm wide 10 thick permalloy layer covered by 170 Fe overlayer. The thickness latter was varied in range from 0 to order analyze its influence on structure. found that frequency spatial profile most intense dispersive mode, can be...
Hybrid elastic and spin waves hold promises for energy-efficient versatile generation detection of magnetic signals, with potentially long coherence times. Here we report on the combined dynamics in a one-dimensional magneto-mechanical crystal composed an array nanowires. Phononic magnonic modes are impulsively excited by optical ultrafast trigger their decay is monitored time resolved Magneto Optical Kerr Effect, complementary Brillouin Light Scattering measurements micromagnetic...
The fabrication and integration of high-quality structures Yttrium Iron Garnet (YIG) is critical for magnonics.Films with excellent properties are obtained only on single crystal Gadolinium Gallium (GGG) substrates using high-temperature processes. subsequent realization magnonic via lithography etching not straightforward as it requires a tight control the edge roughness, to avoid magnon scattering, planarization in case multilayer devices. In this work we describe different approach based...
In thin magnetic films with perpendicular anisotropy, a periodic "up-down" stripe-domain structure can be originated at remanence, on mesoscopic scale (~100 nm) comparable film thickness, by the competition between short-range exchange coupling and long-range dipolar interaction. However, translational order is perturbed because edge dislocations are spontaneously nucleated. Such topological defects play an important role in since they promote in-plane magnetization reversal of stripes and,...
We present the results of advanced micromagnetic simulations, performed using open-source GPU-accelerated code MuMax <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> , on spin waves excitation and propagation in two-dimensional magnonic crystals consisting Permalloy (Ni <sub xmlns:xlink="http://www.w3.org/1999/xlink">80</sub> Fe xmlns:xlink="http://www.w3.org/1999/xlink">20</sub> square antidot lattices. The band structure samples having...
The influence of the Dzyaloshinskii–Moriya interaction (DMI) on eigenmodes magnetic nanostructures is attracting interest for both fundamental reasons and prospects in applications. In this study, characteristics spin waves either long stripes or elliptical dots magnetized in-plane, with lateral dimensions order 100 nm, are analyzed by micromagnetic simulations presence a sizeable DMI. Using GPU-accelerated software MuMax3, we show that spectrum appreciably modified DMI-induced...
The presence of interfacial Dzyaloshinskii-Moriya interaction (DMI) may lead to the appearance N\'eel skyrmions in ferromagnetic films. These topologically protected structures, whose diameter is as small a few nanometers, can be nowadays stabilized at room temperature and have been proposed for realization artificial magnonic crystals new spintronic devices, such racetrack memories. In this perspective, it utmost importance analyze their dynamical properties GHz range, i.e. operation range...
Hybrid elastic and spin waves hold promises for energy-efficient versatile generation detection of magnetic signals, with potentially long coherence times. Here we report on the combined dynamics in a one-dimensional magnetomechanical crystal composed an array nanostripes. Phononic magnonic modes are impulsively excited by optical ultrafast trigger their decay is monitored time-resolved magneto-optical Kerr effect. Complementary Brillouin light scattering measurements micromagnetic...
One of the most appealing features magnonics is easy tunability spin-waves propagation via external magnetic fields. Usually this requires bulky and power-hungry electromagnets which are not compatible with device miniaturization. Here we propose a different approach, exploiting stray field from permanent micromagnets integrated on same chip magnonic wave-guide. In our monolithic device, employ two SmCo square (10x10 $\mu$m$^2$) flanking CoFeB conduit at distances its axis, to produce...
The exceptional magnetic, optical and phononic properties of Yttrium Iron Garnet (YIG) make it unique for spin-wave based photonic applications. Yet, nanostructuring crystalline YIG manipulating its magnetism in a non-destructive way is an outstanding challenge, so far mostly limited to two-dimensional capabilities. Here, we show that irradiation single-crystal films with focused UV laser drives stable, giant enhancement the perpendicular magnetic anisotropy, preserving quality. This...
We report broadband ferromagnetic resonance measurements of the in-plane magnetic field response three- and four-fold symmetric vertices formed by non-contacting permalloy nano-ellipses together with extended lattices constructed from them. Complementing experimental data simulations, we are able to show that, as far most intense FMR responses concerned, spectra can largely be interpreted in terms a superposition underlying hysteretic individual ellipses, elemental building blocks system....
Brillouin light scattering (BLS) experiments assisted by micromagnetic simulations show that the difference in frequency between counterpropagating spin waves extended films and multilayers, induced interfacial Dzyaloshinskii--Moriya interaction (i-DMI), is strongly reduced when lateral confinement introduced. This poses a limit to exploitation of BLS quantify i-DMI strength case magnetic elements, such as dots wires, with dimensions below about 400 nm.
Magnonics is gaining momentum as an emerging technology for information processing. The wave character and Joule heating-free propagation of spin-waves hold promises highly efficient analog computing platforms, based on integrated magnonic circuits. Miniaturization a key issue but, so far, only few examples manipulation in nanostructures have been demonstrated, due to the difficulty tailoring nanoscopic magnetic properties with conventional fabrication techniques. In this Letter, we...
Spin-waves, propagating perturbations in the spin arrangement of magnetic materials, are promising candidates for low-power computation and signal processing. In article number 1906439, Edoardo Albisetti, Elisa Riedo, Daniela Petti, co-workers demonstrate an optically inspired nanomagnonic platform using nanopatterned spin-textures launching spatially shaped wavefronts generating multi-beam interference patterns. They show that controlling spin-waves synthetic antiferromagnets makes a...
Integrated optically-inspired wave-based processing is envisioned to outperform digital architectures in specific tasks, such as image and speech recognition. In this view, spin-waves represent a promising route due their nanoscale wavelength the GHz frequency range rich phenomenology. Here, we realize versatile platform using spin-waves, demonstrating wavefront engineering, focusing, robust interference of with wavelength. particular, use magnonic nanoantennas based on tailored...
Despite the huge recent interest towards chiral magnetism related to interfacial Dzyaloshinskii Moriya interaction (iDMI) in layered systems, there is a lack of experimental data on effect iDMI spin waves eigenmodes laterally confined nanostructures. Here we exploit Brillouin Light Scattering (BLS) analyze wave non-interacting circular and elliptical dots, as well long stripes, patterned starting from Pt(3.4 nm)/CoFeB(0.8 nm) bilayer, with lateral dimensions ranging 100 nm 400 nm. Our...