169 citations · 430 across the 29 of their papers we have counts for
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Hyperchaos in a Magnetic Nanodisk Driven by Ferromagnetic Resonance
A Kolli, Hugo Merbouche, Salvatore Perna +3
We investigate the chaotic dynamics driven in the nonlinear regime of ferromagnetic resonance of an out-of-plane magnetized nanodisk in detail. By combining extensive micromagnetic…
Nonlinear mode interactions under parametric excitation in a YIG microdisk
Gabriel Soares, Rafael Lopes Seeger, Amel Kolli +13
A pair of quantized spin-wave modes is driven by two-tone parallel pumping in a YIG microdisk. The nonlinear dynamics is experimentally investigated by probing the resulting steady…
Radio-frequency assisted switching in perpendicular magnetic tunnel junctions
Mark Hayward, Salvatore Perna, Massimiliano d'Aquino +5
Spin-transfer torque magnetic random-access memory (STT-MRAM) relies on nanoscale magnetic tunnel junctions (MTJs) as its fundamental building blocks. Next-generation STT-MRAM requ…
Self-modulation instability in high power ferromagnetic resonance of BiYIG nanodisks
Igor Ngouagnia Yemeli, Salvatore Perna, Diane Gouéré +9
We study the high power ferromagnetic resonance (FMR) of perpendicularly magnetized BiYIG nanodisks where the uniaxial anisotropy almost compensates the shape anisotropy. We observ…
Quantum Micromagnetic Theory of Magnons in Finite Nanostructures
Claudio Serpico, Salvatore Perna, Massimiliano d'Aquino
This paper presents a quantum field theoretical formalism for studying magnons in finite nanostructures with arbitrary shapes and spatially nonuniform ground states. It extends the…
Mode-resolved micromagnetics study of parametric spin wave excitation in thin-film disks
Maryam Massouras, Salvatore Perna, Massimiliano d'Aquino +2
We present a computational study of the parametric excitation of spin waves in thin film disks with a mode-resolved approach. The method involves projecting out the time-dependent…
Degenerate and non-degenerate parametric excitation in YIG nanostructures
Hugo Merbouche, Ping Che, Titiksha Srivastava +10
We study experimentally the processes of parametric excitation in microscopic magnetically saturated disks of nanometer-thick Yttrium Iron Garnet. We show that, depending on the re…
Micromagnetic study of inertial spin waves in ferromagnetic nanodots
Massimiliano d'Aquino, Salvatore Perna, Matteo Pancaldi +3
Here we report the possibility to excite ultra-short spin waves in ferromagnetic thin-films by using time-harmonic electromagnetic fields with terahertz frequency. Such ultra-fast…
Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points
Steffen Wittrock, Salvatore Perna, Romain Lebrun +6
The emergence of exceptional points (EPs) in the parameter space of a non-hermitian (2D) eigenvalue problem is studied in a general sense in mathematical physics, and has in the la…
Magnetization switching in the inertial regime
Kumar Neeraj, Matteo Pancaldi, Valentino Scalera +4
We have numerically solved the Landau-Lifshitz-Gilbert (LLG) equation in its standard and inertial forms to study the magnetization switching dynamics in a thin film ferromagn…
Analysis in k-space of Magnetization Dynamics Driven by Strong Terahertz Fields
Valentino Scalera, Matthias Hudl, Kumar Neeraj +4
Demagnetization in a thin film due to a terahertz pulse of magnetic field is investigated. Linearized LLG equation in the Fourier space to describe the magnetization dynamics is de…
Experimental evidence of inertial dynamics in ferromagnets
Kumar Neeraj, Nilesh Awari, Sergey Kovalev +17
The understanding of how spins move at pico- and femtosecond time scales is the goal of much of modern research in condensed matter physics, with implications for ultrafast and mor…
Nutation spectroscopy of a nanomagnet driven into deeply nonlinear ferromagnetic resonance
Yi Li, Vladimir V. Naletov, Olivier Klein +7
Strongly out-of-equilibrium regimes in magnetic nanostructures exhibit novel properties, linked to the nonlinear nature of magnetization dynamics, which are of great fundamental an…
Nonlinear magnetization dynamics driven by strong terahertz fields
Matthias Hudl, Massimiliano d'Aquino, Matteo Pancaldi +7
We present a comprehensive experimental and numerical study of magnetization dynamics triggered in a thin metallic film by single-cycle terahertz pulses of MV/m electric f…
Magnetization reversal driven by low dimensional chaos in a nanoscale ferromagnet
Eric Arturo Montoya, Salvatore Perna, Yu-Jin Chen +4
Energy-efficient switching of magnetization is a central problem in nonvolatile magnetic storage and magnetic neuromorphic computing. In the past two decades, several efficient met…
Collective Coordinate Models of Domain Wall Motion in Perpendicularly Magnetized Systems under the Spin Hall Effect and Longitudinal Fields
S. Ali Nasseri, Simone Moretti, Eduardo Martinez +2
Recent studies on heterostructures of ultrathin ferromagnets sandwiched between a heavy metal layer and an oxide have highlighted the importance of spin-orbit coupling (SOC) and br…
Signatures of Chaos in Thermal Switching of Nanomagnets
M. d'Aquino, C. Serpico, S. Perna +4
Thermally-activated magnetization dynamics of small nanoparticles subject to microwave (AC) external fields is studied. It is shown that, under sufficiently strong microwave excita…
Power Spectral Density of Magnetization Dynamics Driven by a Jump-Noise Process
A. Lee, G. Bertotti, C. Serpico +1
Random magnetization dynamics driven by a jump-noise process is reduced to stochastic magnetic energy dynamics on specific graphs using an averaging technique. An approach to analy…
Conservative effects in spin-transfer-driven magnetization dynamics
Giorgio Bertotti, Claudio Serpico, Isaak D. Mayergoyz
It is shown that under appropriate conditions spin-transfer-driven magnetization dynamics in a single-domain nanomagnet is conservative in nature and admits a specific integral of…
Parallel pumping of magnetic vortex gyrations in spin-torque nano-oscillators
P. Bortolotti, C. Serpico, E. Grimaldi +8
We experimentally demonstrate that large magnetic vortex oscillations can be parametrically excited in a magnetic tunnel junction by the injection of radio-frequency (rf) currents…
Spin-wave instabilities in spin-transfer-driven magnetization dynamics
G. Bertotti, R. Bonin, M. d'Aquino +2
We study the stability of magnetization precessions induced in spin-transfer devices by the injection of spin-polarized electric currents. Instability conditions are derived by int…
Spin Transfer Dynamics in Spin Valves with Out-of-plane Magnetized CoNi Free Layers
William H. Rippard, Alina M. Deac, Matthew R. Pufall +5
We have measured spin transfer-induced dynamics in magnetic nanocontact devices having a perpendicularly magnetized Co/Ni free layer and an in-plane magnetized CoFe fixed layer. Th…