145 citations · 223 across the 21 of their papers we have counts for
21 papers
Extended Landau--Lifshitz equation for nanomagnets: a path-integral derivation of surface-induced magnetization nutation
H. Kachkachi, P. Thibaudeau
An effective dynamical equation for the magnetization of a nanomagnet with surface anisotropy is derived from an atomistic spin Hamiltonian using the spin coherent-state path integ…
Path integral spin dynamics for quantum paramagnets
Thomas Nussle, Pascal Thibaudeau, Stam Nicolis
A path integral method, combined with atomistic spin dynamics simulations, has been developed to calculate thermal quantum expectation values using a classical approach. In this st…
Emerging magnetic nutation
Pascal Thibaudeau, Stam Nicolis
Nutation has been recognized as of great significance for spintronics; but justifying its presence has proven to be a hard problem. In this paper we show that nutation can be under…
Spin dynamics from a constrained magnetic Tight-Binding model
Ramon Cardias, Cyrille Barreteau, Pascal Thibaudeau +1
A dynamics of the precession of coupled atomic moments in the tight-binding (TB) approximation is presented. By implementing an angular penalty functional in the energy that captur…
Dynamic magnetostriction for antiferromagnets
Thomas Nussle, Pascal Thibaudeau, Stam Nicolis
In this paper we study the switching properties of the dynamics of magnetic moments, that interact with an elastic medium. To do so we construct a Hamiltonian framework, that can t…
Probing magneto-elastic phenomena through an effective spin-bath coupling model
Thomas Nussle, Pascal Thibaudeau, Stam Nicolis
A phenomenological model is constructed, that captures the effects of coupling magnetic and elastic degrees of freedom, in the presence of external, stochastic perturbations, in te…
Massively parallel symplectic algorithm for coupled magnetic spin dynamics and molecular dynamics
J. Tranchida, S. J. Plimpton, P. Thibaudeau +1
A parallel implementation of coupled spin-lattice dynamics in the LAMMPS molecular dynamics package is presented. The equations of motion for both spin only and coupled spin-lattic…
A group action principle for Nambu dynamics of spin degrees of freedom
Stam Nicolis, Pascal Thibaudeau, Thomas Nussle
We describe a formulation of the group action principle, for linear Nambu flows, that explicitly takes into account all the defining properties of Nambu mechanics and illustrate it…
Coupling magneto-elastic Lagrangians to spin transfer torque sources
Thomas Nussle, Pascal Thibaudeau, Stam Nicolis
The consequences of coupling magnetic and elastic degrees of freedom, where spins and deformations are carried by point-like objects subject to local interactions, are studied, the…
Finite-dimensional colored fluctuation-dissipation theorem for spin systems
Stam Nicolis, Pascal Thibaudeau, Julien Tranchida
When nano-magnets are coupled to random external sources, their magnetization becomes a random variable, whose properties are defined by an induced probability density, that can be…
Nambu mechanics for stochastic magnetization dynamics
Pascal Thibaudeau, Thomas Nussle, Stam Nicolis
The Landau-Lifshitz-Gilbert (LLG) equation describes the dynamics of a damped magnetization vector that can be understood as a generalization of Larmor spin precession. The LLG equ…
Probing the hue of the stochastic magnetization dynamics
Stam Nicolis, Julien Tranchida, Pascal Thibaudeau
The Fokker--Planck equation describes the evolution of a probability distribution towards equilibrium--the flow parameter is the equilibration time. Assuming the distribution remai…
A functional calculus for the magnetization dynamics
Julien Tranchida, Pascal Thibaudeau, Stam Nicolis
A functional calculus approach is applied to the derivation of evolution equations for the moments of the magnetization dynamics of systems subject to stochastic fields. It allows…
Colored-noise magnetization dynamics: from weakly to strongly correlated noise
Julien Tranchida, Pascal Thibaudeau, Stam Nicolis
Statistical averaging theorems allow us to derive a set of equations for the averaged magnetization dynamics in the presence of colored (non-Markovian) noise. The non-Markovian cha…
Non-Markovian magnetization dynamics for uniaxial nanomagnets
Pascal Thibaudeau, Julien Tranchida, Stam Nicolis
A stochastic approach for the description of the time evolution of the magnetization of nanomagnets is proposed, that interpolates between the Landau-Lifshitz-Gilbert and the Landa…
Frequency-dependent effective permeability tensor of unsaturated polycrystalline ferrites
Pascal Thibaudeau, Julien Tranchida
Frequency-dependent permeability tensor for unsaturated polycrystalline ferrites is derived through an effective medium approximation that combines both domain-wall motion and rota…
Closing the hierarchy for non-Markovian magnetization dynamics
Julien Tranchida, Pascal Thibaudeau, Stam Nicolis
We propose a stochastic approach for the description of the time evolution of the magnetization of nanomagnets, that interpolates between the Landau--Lifshitz--Gilbert and the Land…
Quantum Magnets and Matrix Lorenz Systems
Julien Tranchida, Pascal Thibaudeau, Stam Nicolis
The Landau--Lifshitz--Gilbert equations for the evolution of the magnetization, in presence of an external torque, can be cast in the form of the Lorenz equations and, thus, can de…
Knotted Strange Attractors and Matrix Lorenz Systems
J. Tranchida, P. Thibaudeau, S. Nicolis
A generalization of the Lorenz equations is proposed where the variables take values in a Lie algebra. The finite dimensionality of the representation encodes the quantum fluctuati…
The Off-Shell Electromagnetic T-matrix: momentum-dependent scattering from spherical inclusions with both dielectric and magnetic contrast
Yves-Patrick Pellegrini, Pascal Thibaudeau, Brian Stout
The momentum- and frequency-dependent T-matrix operator for the scattering of electromagnetic waves by a dielectric/conducting and para- or diamagnetic sphere is derived as a Mie-t…
An embedded-atom method model for liquid Co, Nb, Zr and supercooled binary alloys
Pascal Thibaudeau, Julian Gale
The parameters of many-body potentials for Co, Nb and Zr metals, based on the embedded-atom method, have been systematically derived. The analytical potential scheme allows us to r…