A5038000502- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Neural Networks and Reservoir Computing
- Advanced Memory and Neural Computing
- Quantum and electron transport phenomena
- Electric Motor Design and Analysis
- Ferroelectric and Negative Capacitance Devices
- Magnetic Properties and Applications
- Multiferroics and related materials
- Neural Networks and Applications
- Photonic Crystals and Applications
- Wireless Signal Modulation Classification
- Plant Physiology and Cultivation Studies
- Neural dynamics and brain function
- Plant Pathogens and Fungal Diseases
- Horticultural and Viticultural Research
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Characterization and Applications of Magnetic Nanoparticles
- Entomopathogenic Microorganisms in Pest Control
- Semiconductor Quantum Structures and Devices
- Hemiptera Insect Studies
- Magnetic Field Sensors Techniques
- Terahertz technology and applications
- Surface Roughness and Optical Measurements
Université Paris-Saclay
2015-2024
Laboratoire Albert Fert
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Conference Board
2023-2024
Antea Group (France)
2023-2024
Institute of Electrical and Electronics Engineers
2021-2024
Thales (France)
2023-2024
CEA Grenoble
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
Spintronique et Technologie des Composants
2021-2022
Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in GHz-to-THz frequency range, utilization nonlinear nonreciprocal phenomena, compatibility with CMOS are just a few many advantages offered by magnons. Although magnonics is still primarily positioned academic domain, scientific technological challenges field being extensively investigated, proof-of-concept prototypes have already been realized...
High quality nanometer-thick (20 nm, 7 nm and 4 nm) epitaxial YIG films have been grown on GGG substrates using pulsed laser deposition. The Gilbert damping coefficient for the 20 thick is 2.3 x 10-4 which lowest value reported sub-micrometric films. We demonstrate Inverse spin Hall effect (ISHE) detection of propagating waves Pt. amplitude lineshape ISHE voltage correlate well to increase when decreasing thickness YIG. Spin based loss-compensation experiments conducted but no change in...
Abstract Magnonic nano-devices exploit magnons - quanta of spin waves to transmit and process information within a single integrated platform that has the potential outperform traditional semiconductor-based electronics. The main missing cornerstone this nanotechnology is an efficient scheme for amplification propagating waves. recent discovery spin-orbit torque provided elegant mechanism propagation losses compensation. While partial compensation spin-wave been achieved, true – exponential...
Seven decades after the discovery of collective spin excitations in microwave-irradiated ferromagnets, there has been a rebirth magnonics. However, magnetic nanodevices will enable smart GHz-to-THz devices at low power consumption only, if such waves (magnons) are generated and manipulated on sub-100 nm scale. Here we show how magnons with wavelength few 10 exploited by combining functionality insulating yttrium iron garnet nanodisks from different ferromagnets. We demonstrate magnonic...
Abstract The concept of spin-torque-driven high-frequency magnetization dynamics, allows the potential construction complex networks non-linear dynamical nanoscale systems, combining field spintronics and study systems. In few previous demonstrations synchronization several spin-torque oscillators, short-range nature magnetic coupling that was used has largely hampered a complete control process. Here we demonstrate successful mutual two oscillators with large separation distance through...
Spin-torque nano-oscillators can emulate neurons at the nanoscale. Recent works show that non-linearity of their oscillation amplitude be leveraged to achieve waveform classification for an input signal encoded in voltage. Here, we frequency and phase oscillator also used recognize waveforms. For this purpose, phase-lock waveform, which carries information its modulated frequency. In way, considerably decrease amplitude, phase, noise. We method allows classifying sine square waveforms with...
We study experimentally with submicrometer spatial resolution the propagation of spin waves in microscopic waveguides based on nanometer-thick yttrium iron garnet and Pt layers. demonstrate that by using spin-orbit torque, length such systems can be increased nearly a factor 10, which corresponds to increase spin-wave intensity at output 10 μm long transmission line three orders magnitude. also show that, regime, where magnetic damping is completely compensated amplification suppressed...
Spin-wave propagation in microfabricated 20 nm thick, 2.5 μm wide Yttrium Iron Garnet (YIG) waveguides is studied using propagating spin-wave spectroscopy (PSWS) and phase resolved micro-focused Brillouin Light Scattering (μ-BLS) spectroscopy. We demonstrate that 50 parallel robust against microfabrication induced imperfections extract parameters for the Damon-Eshbach configuration a range of excitation frequencies. As expected from its low damping, YIG allows spin waves over long distances;...
The recent demonstration of neuromorphic computing with spin-torque nano-oscillators has opened a path to energy efficient data processing. success this hinged on the intrinsic short-term memory oscillators. In study, we extend through time-delayed feedback. We leverage extrinsic increase efficiency solving pattern recognition tasks that require discriminate different inputs. large tunability these non-linear oscillators allows us control and optimize delayed feedback using operating...
Spin-waves in antiferromagnets hold the prospects for development of faster, less power-hungry electronics and promising physics based on spin superfluids coherent magnon condensates. For both these perspectives, addressing electrically antiferromagnetic spin-waves is importance, a prerequisite that has been so far elusive, because, unlike ferromagnets, couple weakly to radiofrequency fields. Here, we demonstrate detection ultra-fast nonreciprocal dipolar exchange regime canted...
The quanta of magnetic excitations - magnons are known for their unique ability to undergo Bose-Einstein condensation at room temperature. This fascinating phenomenon reveals itself as a spontaneous formation coherent state under the influence incoherent stimuli. Spin currents have been predicted offer electronic control condensates, but this has not experimentally evidenced up now. Here we show that current-driven can be achieved in nanometer-thick films insulators with tailored...
Abstract The brain naturally binds events from different sources in unique concepts. It is hypothesized that this process occurs through the transient mutual synchronization of neurons located regions when stimulus presented. This mechanism ‘binding synchronization’ can be directly implemented neural networks composed coupled oscillators. To do so, oscillators must able to mutually synchronize for range inputs corresponding a single class, and otherwise remain desynchronized. Here we show...
Abstract The emergence of exceptional points (EPs) in the parameter space a non-hermitian (2D) eigenvalue problem has long been interest mathematical physics, however, only last decade entered scope experiments. In coupled systems, EPs give rise to unique physical phenomena, and enable development highly sensitive sensors. Here, we demonstrate at room temperature spintronic nanoscale oscillators exploit system’s non-hermiticity. We observe amplitude death self-oscillations other complex...
We report on an experimental study the spin-waves relaxation rate in two series of nanodisks diameter ϕ=300, 500, and 700 nm, patterned out systems: a 20 nm thick yttrium iron garnet (YIG) film grown by pulsed laser deposition either bare or covered 13 Pt. Using magnetic resonance force microscope, we measure precisely ferromagnetic linewidth each individual YIG YIG|Pt nanodisks. find that nanostructure is sensibly smaller than one measured extended film. Analysis frequency dependence...
Abstract The self-synchronization of spin torque oscillators is investigated experimentally by re-injecting its radiofrequency (rf) current after a certain delay time. We demonstrate that the integrated power and spectral linewidth are improved for optimal delays. Moreover varying phase difference between emitted re-injected one, we find clear oscillatory dependence on with 2π periodicity frequency oscillator as well linewidth. Such periodical behavior within self-injection regime described...
We investigate the effect of an electrical current on attenuation length a 900 nm wavelength spin-wave in permalloy/Pt bilayer using propagating spectroscopy. The modification relaxation rate is linear density, reaching up to 14% for density 2.3 × 1011 A/m2 Pt. This change attributed spin transfer torque induced by Hall and corresponds effective angle 0.13, which among highest values reported so far. thus appears as efficient way amplifying/attenuating waves.
Abstract Artificial neural networks are a valuable tool for radio-frequency (RF) signal classification in many applications, but the digitization of analog signals and use general purpose hardware non-optimized training make process slow energetically costly. Recent theoretical work has proposed to nano-devices called magnetic tunnel junctions, which exhibit intrinsic RF dynamics, implement multiply accumulate (MAC) operation—a key building block networks—directly using signals. In this...
Abstract Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study dynamic modes excited current in nanometer-thick microscopic Yttrium Iron Garnet disks. We show that these exhibit nonlinear self-broadening preventing formation self-localized bullet, plays a...
Magnetic tunnel junctions are nanoscale spintronic devices with microwave generation and detection capabilities. Here we use the rectification effect called "spin-diode" in a magnetic junction to wirelessly detect emission of another auto-oscillatory regime. We show that rectified spin-diode voltage measured at receiving end can be reconstructed from independently auto-oscillation spin diode spectra each junction. Finally adapt auto-oscillator model case spin-torque oscillator accurately...
Nonlinear self-phase modulation is a universal phenomenon responsible, for example, the formation of propagating dynamic solitons. It has been reported waves different physical nature. However its direct experimental observation spin challenging. Here we show that exceptionally strong phase can be achieved in microscopic waveguides fabricated from nanometer-thick films magnetic insulator, which support propagation with large amplitudes corresponding to angles magnetization precession...
Fabricating powerful neuromorphic chips the size of a thumb requires miniaturizing their basic units: synapses and neurons. The challenge for neurons is to scale them down submicrometer diameters while maintaining properties that allow reliable information processing: high signal noise ratio, endurance, stability, reproducibility. In this work, we show compact spin-torque nano-oscillators can naturally implement such neurons, quantify ability realize an actual cognitive task. particular,...