Alessandro Fortunati

A constructive approach to a class of overdetermined problems

Alessandro Fortunati, Filomena Pacella

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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A Constructive Approach to a Class of Overdetermined Problems

Alessandro Fortunati, Filomena Pacella

In this paper we study an overdetermined problem which is directly related to the well known torsion problem studied by J. Serrin. A perturbed version of the latter is tackled by using asymptotic series as well as tools borrowed from the celebrated …

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Dispersive waves in microstructure-informed peridynamic continua

Vito Diana, Alessandro Fortunati, Andrea Bacigalupo

We examine the dispersion behavior and spatial attenuation of generalized oriented peridynamic continua with non-central pair-potential interactions. The free-wave propagation problem is analyzed analytically through integral transform methods, enabling the closed-form derivation of dispersion relations for real-valued wavenumbers. A complementary perturbation approach …

Multiscale modeling of transient problems in periodic Cauchy materials: Asymptotic and spectro-hierarchical homogenization

Alessandro Fortunati, Francesca Fantoni, Andrea Bacigalupo

This work presents a detailed and systematic analytical investigation of the transient elastic wave propagation in two-dimensional periodic heterogeneous composites. The study is conducted through two complementary methodologies: asymptotic homogenization and a recently proposed spectro-hierarchical approach, specifically designed to resolve higher-order microstructural …

Dispersive waves in microstructure-informed peridynamic continua

Vito Diana, Alessandro Fortunati, Andrea Bacigalupo

A Class-AB Slew Rate-Enhanced OTA for Triboelectric Sensing Interfaces in Smart Textiles

Alessandro Fortunati, Elisabetta Moisello, Emmanuele Mozzorecchia, Emanuele Quartieri et autres

This paper proposes a three-stage operational transconductance amplifier (OTA) with slew-rate enhancing, especially designed for interfacing triboelectric nanogenerator sensors in smart textile applications. The proposed OTA, designed in a 130-nm BCD process, features 0.015-mm2area and 2.7-µW power consumption with 1.3-V supply voltage, …

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Spectro-hierarchical homogenization scheme for elasto-dynamic problems in periodic Cauchy materials

Alessandro Fortunati, D. Misseroni, A. Bacigalupo

The paper introduces a spectro-hierarchical algorithm for approximating solutions to elasto-dynamic problems in periodic heterogeneous materials. This homogenization technique leverages finite-dimensional perturbation theory based on Nekhoroshev’s theorem. The method uses a harmonic hierarchy to construct functions that approximate the solution with a …

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Spectro-hierarchical homogenization scheme for elasto-dynamic problems in periodic Cauchy materials

Alessandro Fortunati, D. Misseroni, A. Bacigalupo

The paper introduces a spectro-hierarchical algorithm for approximating solutions to elasto-dynamic problems in periodic heterogeneous materials. This homogenization technique leverages finite-dimensional perturbation theory based on Nekhoroshev’s theorem. The method uses a harmonic hierarchy to construct functions that approximate the solution with a …

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On the constructivity of the variational approach to Arnold’s Diffusion

Alessandro Fortunati

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Spectro-hierarchical homogenization scheme for elasto-dynamic problems in periodic Cauchy materials

Alessandro Fortunati, Diego Misseroni, Andrea Bacigalupo

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Controlled Quasi-Latitudinal Solutions for Ultra-Fast Spin-Torque Magnetization Switching

Alessandro Fortunati, Massimiliano d’Aquino, C. Serpico

The aim of this paper is to present a novel class of time-dependent controls to realize ultra-fast magnetization switching in nanomagnets driven by spin-torques produced by spin-polarized electric currents. Magnetization dynamics in such complex systems is governed by the Landau–Lifshitz–Slonczewski equation which …

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