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Your search keyword '"Finocchio, G."' showing total 18 results
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18 results on '"Finocchio, G."'

2. Simultaneous multitone microwave emission by DC-driven spintronic nano-element

Author

Hamadeh, A., Slobodianiuk, D., Moukhader, R., Melkov, G., Borynskyi, V., Mohseni, M., Finocchio, G., Lomakin, V., Verba, R., de Loubens, G., Pirro, P., Klein, O., Lebanese University [Beirut] (LU), Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universit ̈at Kaiserslautern, Taras Shevchenko National University of Kyiv, University of Messina, Department of Radiophysics [Kyiv], Institute of Magnetism of NAS of Ukraine (IMAG), National Academy of Sciences of Ukraine (NASU), Department of Plant Protection, Shahrekord University, Center for Memory and Recording Research, University of California [San Diego] (UC San Diego), University of California (UC)-University of California (UC), Laboratoire Nano-Magnétisme et Oxydes (LNO), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Technische Universität Kaiserslautern (TU Kaiserslautern), SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)

Subjects
Condensed Matter - Other Condensed Matter, Condensed Matter - Mesoscale and Nanoscale Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], FOS: Physical sciences, Other Condensed Matter (cond-mat.other)
Abstract

Current-induced self-sustained magnetization oscillations in spin-torque nano-oscillators (STNOs) are promising candidates for ultra-agile microwave sources or detectors. While usually STNOs behave as a monochrome source, we report here clear bimodal simultaneous emission of incommensurate microwave oscillations, where the two tones correspond to two parametrically coupled eigenmodes with tunable splitting. The emission range is crucially sensitive to the change in hybridization of the eigenmodes of free and fixed layers, for instance, through a slight tilt of the applied magnetic field from the normal of the nano-pillar. Our experimental findings are supported both analytically and by micromagnetic simulations, which ascribe the process to four-magnon scattering between a pair of radially symmetric magnon modes and a pair of magnon modes with opposite azimuthal index. Our findings open up new possibilities for cognitive telecommunications and neuromorphic systems that use frequency multiplexing to improve communication performance.

Published
2022
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17. Description of Statistical Switching in Perpendicular STT-MRAM Within an Analytical and Numerical Micromagnetic Framework

Author

Bruno Azzerboni, Giulio Siracusano, Patrick M. Braganca, Giovanni Finocchio, Anna Giordano, Riccardo Tomasello, Vito Puliafito, Massimiliano d'Aquino, Mario Carpentieri, Siracusano, G., Tomasello, R., D'Aquino, M., Puliafito, V., Giordano, A., Azzerboni, B., Braganca, P., Finocchio, G., and Carpentieri, M.

Subjects
Computer science, media_common.quotation_subject, Kurtosis, skewness, spin-transfer torque (STT), STT-magnetoresistive random access memory (MRAM), FOS: Physical sciences, Probability density function, 02 engineering and technology, Method of moments (statistics), 01 natural sciences, Asymmetry, Standard deviation, Switching time, Magnetization, Computer Science::Hardware Architecture, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Statistical physics, Electrical and Electronic Engineering, Micromagnetics, media_common, 010302 applied physics, Kurtosis, skewness, spin-transfer torque (STT), STT-magnetoresistive random access memory (MRAM), Magnetoresistive random-access memory, Spintronics, Condensed Matter - Mesoscale and Nanoscale Physics, Function (mathematics), 021001 nanoscience & nanotechnology, Electronic, Optical and Magnetic Materials, Skewness, 0210 nano-technology
Abstract

The realistic modeling of spin-transfer torque (STT)-magnetoresistive random access memory (MRAM) for the simulations of hybrid CMOS/Spintronics devices in comprehensive simulation environments requires a full description of stochastic switching processes in the state-of-the-art STT-MRAMs. Here, we compare micromagnetic simulations with an analytical formulation that takes into account the spin-torque asymmetry of the spin-polarization function by considering the mean, standard deviation, skewness, and kurtosis. We find that, while the first and second statistical moments exhibit a very similar behavior, skewness and kurtosis are substantially different and must be taken into account in order to provide an accurate prediction of the switching performance. In fact, a reasonable fit of the probability density function (PDF) of the switching time is given by a Pearson Type IV PDF. The main achievements of this paper underline the need of data-driven design of STT-MRAM that uses a full micromagnetic simulation framework for the statistical proprieties PDF of switching processes.

Published
2018

18. Spin-Hall Nano-Oscillator With Oblique Magnetization And Dzyaloshinskii-Moriya Interaction As Generator Of Skyrmions And Nonreciprocal Spin-Waves

Author

Anna Giordano, Vito Puliafito, Gianluca Gubbiotti, Antonino Laudani, Roberto Zivieri, Mario Carpentieri, Bruno Azzerboni, Giulio Siracusano, Roman Verba, Giovanni Finocchio, Riccardo Tomasello, Andrei Slavin, Giordano, A., Verba, R., Zivieri, R., Laudani, Antonino, Puliafito, V., Gubbiotti, G., Tomasello, R., Siracusano, G., Azzerboni, B., Carpentieri, M., Slavin, A., and Finocchio, G.

Subjects
skyrmions, Spin-Hall effect, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Article, NO, Magnetization, nonreciprocal propagation effect, Spin wave, 0103 physical sciences, 010306 general physics, Spin-½, Physics, Magnonics, Dzyaloshinskii-Moriya interaction, Magnetization dynamics, Condensed Matter - Materials Science, Spin-Hall effect, Dzyaloshinskii-Moriya interaction, skyrmions, nonreciprocal propagation effect, Multidisciplinary, Condensed matter physics, Skyrmion, CURRENT-DRIVEN DYNAMICS, TRANSFER TORQUE, DOMAIN-WALLS, EXCITATION, ANISOTROPY, BEAMS, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Excited state, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Excitation
Abstract

Spin-Hall oscillators (SHO) are promising sources of spin-wave signals for magnonics applications, and can serve as building blocks for magnonic logic in ultralow power computation devices. Thin magnetic layers used as “free” layers in SHO are in contact with heavy metals having large spin-orbital interaction, and, therefore, could be subject to the spin-Hall effect (SHE) and the interfacial Dzyaloshinskii-Moriya interaction (i-DMI), which may lead to the nonreciprocity of the excited spin waves and other unusual effects. Here, we analytically and micromagnetically study magnetization dynamics excited in an SHO with oblique magnetization when the SHE and i-DMI act simultaneously. Our key results are: (i) excitation of nonreciprocal spin-waves propagating perpendicularly to the in-plane projection of the static magnetization; (ii) skyrmions generation by pure spin-current; (iii) excitation of a new spin-wave mode with a spiral spatial profile originating from a gyrotropic rotation of a dynamical skyrmion. These results demonstrate that SHOs can be used as generators of magnetic skyrmions and different types of propagating spin-waves for magnetic data storage and signal processing applications.

Published
2016

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