64 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR31 papers
- Université de PerpignanFR25 papers
- University of LuxembourgLU4 papers
- Centre de Recherche d'Albi en génie des Procédés, des SOlides Divisés, de l'Énergie et de l'EnvironnementFR3 papers
- Institut PascalFR3 papers
- Laboratoire Plasma et Conversion d'EnergieFR3 papers
- Université Clermont AuvergneFR3 papers
- Université Toulouse III - Paul SabatierFR3 papers
- Centre d'Énergétique et de Thermique de LyonFR2 papers
- Centre de Recherches sur la Cognition AnimaleFR2 papers
- École Polytechnique Fédérale de LausanneCH2 papers
- Institut National Polytechnique de ToulouseFR2 papers
16 papers · 1 filter
Plasmon-Plasmon Interaction in Nanoparticle Assemblies: Role of the Dipole-Quadrupole Coupling
Olivier Masset, Roland Bastardis, Francois Vernay
The synthesis of metallic nanoparticle assemblies is nowadays well-controlled, such that these systems offer the possibility of controlling light at a sub-wavelength scale, thanks,…
Low-frequency signature of magnetization nutation in nanomagnets
M. P. Adams, R. Bastardis, A. Michels +1
In this work, we show that surface anisotropy in nanomagnets induces a nutational motion of their magnetization at various frequencies, the lowest of which can be described by the…
Spatial magnetization profile in spherical nanomagnets with surface anisotropy: Green's function approach
M. P. Adams, A. Michels, H. Kachkachi
We consider a single spherical nanomagnet and investigate the spatial magnetization profile in the continuum approach, using the Green's functio…
Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Atomistic simulations
Michael P. Adams, Andreas Michels, Hamid Kachkachi
We consider a dilute ensemble of randomly-oriented noninteracting spherical nanomagnets and investigate its magnetization structure and ensuing neutron-scattering response by numer…
Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Analytical treatment
Michael P. Adams, Andreas Michels, Hamid Kachkachi
The magnetization profile and the related magnetic small-angle neutron scattering cross section of a single spherical nanoparticle with Neel surface anisotropy is analytically inve…
Surface-induced reduction of the switching field in nanomagnets
R. Bastardis, H. Kachkachi
Magnetization reversal in a many-spin nanomagnet subjected to an rf magnetic field, on top of a DC magnetic field, is studied by numerically solving the system of coupled (damped)…
Specific absorption rate of magnetic nanoparticles: nonlinear AC susceptibility
J. -L. Déjardin, F. Vernay, H. Kachkachi
In the context of magnetic hyperthermia, several physical parameters are used to optimize the heat generation and these include the nanoparticles concentration and the magnitude an…
Single-particle versus collective effects in assemblies of nanomagnets: screening
F. Vernay, H. Kachkachi
We discuss experimentally realizable situations in which surface effects may "screen out" the dipolar interactions in an assembly of nanomagnets, which then behaves as a noninterac…
Magnetization nutation induced by surface effects in nanomagnets
Roland Bastardis, Francois Vernay, Hamid Kachkachi
We investigate the magnetization dynamics of ferromagnetic nanoparticles in the atomistic approach taking account of surface anisotropy and the spin misalignment it causes. We demo…
Ferromagnetic resonance of a two-dimensional array of nanomagnets: Effects of surface anisotropy and dipolar interactions
J. -L. Déjardin, A. F. Franco, F. Vernay +1
We develop an analytical approach for studying the FMR frequency shift due to dipolar interactions and surface effects in two-dimensional arrays of nanomagnets with (effective) uni…
Effect of dipolar interactions and DC magnetic field on the specific absorption rate of an array of magnetic nanoparticles
J. -L. Déjardin, F. Vernay, M. Respaud +1
We address the issue of inter-particle dipolar interactions in the context of magnetic hyperthermia. More precisely, the main question dealt with here is concerned with the conditi…
Surface effects on ferromagnetic resonance in magnetic nanocubes
R. Bastardis, F. Vernay, D. -A. Garanin +1
We study the effect of surface anisotropy on the spectrum of spin-wave excitations in a magnetic nanocluster and compute the corresponding absorbed power. For this, we develop a ge…
Ferromagnetic resonance of coupled shifted chains of nano-elements
Roland Bastardis, Jean-Louis Déjardin, François Vernay +1
We investigate the FMR characteristics of a magnetic dimer composed of two chains of iron nanoparticles coupled by dipolar interactions. The latter are treated beyond the point-dip…
AC susceptibility of an assembly of nanomagnets: combined effects of surface anisotropy and dipolar interactions
F. Vernay, Z. Sabsabi, H. Kachkachi
We compute the AC susceptibility of a weakly dipolar-interacting monodisperse assembly of magnetic nanoclusters with oriented anisotropy. For this purpose we first compute the rela…
Interplay between surface anisotropy and dipolar interactions in an assembly of nanomagnets
Z. Sabsabi, F. Vernay, O. Iglesias +1
We study the interplay between the effects of surface anisotropy and dipolar interactions in monodisperse assemblies of nanomagnets with oriented anisotropy. We derive asymptotic f…
Microwave-assisted switching of a nanomagnet: analytical determination of the optimal microwave field
N. Barros, M. Rassam, H. Kachkachi
We analytically determine the optimal microwave field that allows for the magnetization reversal of a nanomagnet modeled as a macrospin. This is done by minimizing the total inject…