C. Serpico

Analytical solutions for ultra-fast precessional switching in inertial magnetization dynamics

Alessandro Fortunati, Massimiliano d'Aquino, C. Serpico

Abstract Here we consider the magnetization dynamics in ferromagnetic nanoparticles or films driven by external magnetic field pulses directed transverse to the initial equilibrium state. The excitation pulse drives large-angle ultra-fast magnetization dynamics that may eventually end up in the reversed equilibrium …

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Radio-frequency assisted switching in perpendicular magnetic tunnel junctions

Salvatore Perna, Massimiliano d'Aquino, C. Serpico, Wonjoon Jung et autres

Abstract 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 requires strategies that simultaneously improve switching energy efficiency and device endurance. Here, we present the first study of perpendicular STT-MRAM writing …

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Nonlinear mode interactions under parametric excitation in a YIG microdisk

Gabriel Soares, Rafael Lopes Seeger, Amel Kolli, Maryam Massouras et autres

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 state, which is found to critically depend on the chosen pair of modes, the detuning …

Nonlinear mode interactions under parametric excitation in a YIG microdisk

Gabriel Soares, Rafael Lopes Seeger, Amel Kolli, Maryam Massouras et autres

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 state, which is found to critically depend on the chosen pair of modes, the detuning …

Magnetoelastic actuated motion of fine ferromagnetic particles

Giovanni Di Fratta, C. Serpico, Valeriy Slastikov

Abstract Wireless magnetic actuation offers precise control over microscopic devices, yet full planar manipulation of rigid, tethered magnetic particles remains challenging. We introduce a minimal variational model: a permanently magnetized planar ellipse anchored by two linear springs. First, we derive exact geometric …

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Encirclement of an exceptional point and eigenvalue switch in non-Hermitian coupled spintronic nano-oscillators

Katia Ho, Salvatore Perna, Steffen Wittrock, Nhat-Tan Phan et autres

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CLIC readiness report

E. Adli, G. D’Auria, Nuria Catalán Lasheras, Vera Cilento et autres

Abstract The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear e + e − collider studied by the international CLIC and CLICdp collaborations hosted by CERN. CLIC uses a two-beam acceleration scheme, in which normal-conducting high-gradient 12 GHz accelerating structures are …

Self-Modulation Instability in High Power Ferromagnetic Resonance of BiYIG Nanodisks

Salvatore Perna, Diane Gouéré, Abdelfatah Kolli, Soraya Sangiao et autres

We study the high power ferromagnetic resonance of perpendicularly magnetized BiYIG nanodisks where the uniaxial anisotropy almost compensates for the shape anisotropy. We observe a strong saturation of the averaged magnetization upon moderately increasing the amplitude of the rf field and a …

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Quantum micromagnetic theory of magnons in finite nanostructures

C. 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 classical micromagnetic formalism by introducing a micromagnetic Hamiltonian quantum operator, which incorporates exchange, Dzyaloshinsky-Moriya, anisotropy, magnetostatic, and …

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Controlling encirclement of an exceptional point using coupled spintronic nano-oscillators

Kuo–Chuan Ho, Salvatore Perna, Steffen Wittrock, Sumito Tsunegi et autres

Exceptional points (EPs), branch singularities parameter space of non-Hermitian eigenvalue manifolds, display unique topological phenomena linked to eigenvalue and eigenvector switching: the parameter space states are highly sensitive to the system's parameter changes. Therefore, we suggest investigating the parameter space in the …

Mode-resolved micromagnetics study of parametric spin wave excitation in thin-film disks

Maryam Massouras, Salvatore Perna, Massimiliano d’Aquino, C. Serpico et autres

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 magnetization, computed using micromagnetics simulations, onto the spatial profile of the eigenmodes that are obtained from …

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Degenerate and nondegenerate parametric excitation in yttrium iron garnet nanostructures

Hugo Merbouche, Ping Che, Titiksha Srivastava, Nathan Beaulieu et autres

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 relative orientation of the parametric pumping field and the static magnetization, excitation of either degenerate or nondegenerate magnon …

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