The Experts below are selected from a list of 8826 Experts worldwide ranked by ideXlab platform
Stam Nicolis - One of the best experts on this subject based on the ideXlab platform.
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Nutation Wave as a Platform for Ultrafast Spin Dynamics in Ferromagnets
Applied Physics Letters, 2020Co-Authors: Imam Makhfudz, Enrick Olive, Stam NicolisAbstract:The Inertia Term becomes relevant for the magnetization dynamics of ferromagnets at short time scales and leads to nutation motion of the magnetization vector. In the simplest model, of a Heisenberg spin chain with isotropic spin-exchange interaction, the occurrence of a "nutation wave" is analytically demonstrated and numerically confirmed. The corresponding excitation spectrum describes relativistic massive particles. The single-particle excitation, the "nutaton", acts like the Higgs boson with respect to an emergent topological gauge field. This spin excitation would appear as a peak in the spectrum of the scattering structure factor from inelastic neutron scattering experiments. The high frequency and speed of the nutation wave can open new paths towards new ways of realizing ultrafast spin dynamics.
Florinda Capone - One of the best experts on this subject based on the ideXlab platform.
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double diffusive soret convection phenomenon in porous media effect of vadasz Inertia Term
Ricerche Di Matematica, 2019Co-Authors: Florinda Capone, Roberta De Luca, Maria VitielloAbstract:The onset of double-diffusive convection in horizontal porous layers for the thermo-diffusive Soret phenomenon in the case of a generalized Darcy model including Inertia Term is investigated. Via a linearization principle recently introduced in Rionero (Atti Accad Naz Lincei Rend Cl Sci Fis Mat Natur 28:21–47, 2017) the coincidence between linear and nonlinear (global) stability thresholds of the thermo-solutal conduction solution, is proved. Necessary and sufficient conditions guaranteeing the onset of steady or oscillatory convection in a closed algebraic form are obtained.
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porous mhd convection effect of vadasz Inertia Term
Transport in Porous Media, 2017Co-Authors: Florinda Capone, Roberta De LucaAbstract:The onset of porous convection in an electrically conducting fluid uniformly heated from below and embedded in an external transverse constant magnetic field is analysed. In particular the effect of Vadasz Inertia Term, measured through the Vadasz number \(V_a\), on the instability threshold, is investigated. For the three-dimensional perturbations and full nonlinear problem it is shown that sub-critical instabilities do not exist and the global nonlinear stability is guaranteed by the linear stability. The long-time behaviour is characterized via the existence of \(L^2\)-absorbing sets.
Imam Makhfudz - One of the best experts on this subject based on the ideXlab platform.
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Nutation Wave as a Platform for Ultrafast Spin Dynamics in Ferromagnets
Applied Physics Letters, 2020Co-Authors: Imam Makhfudz, Enrick Olive, Stam NicolisAbstract:The Inertia Term becomes relevant for the magnetization dynamics of ferromagnets at short time scales and leads to nutation motion of the magnetization vector. In the simplest model, of a Heisenberg spin chain with isotropic spin-exchange interaction, the occurrence of a "nutation wave" is analytically demonstrated and numerically confirmed. The corresponding excitation spectrum describes relativistic massive particles. The single-particle excitation, the "nutaton", acts like the Higgs boson with respect to an emergent topological gauge field. This spin excitation would appear as a peak in the spectrum of the scattering structure factor from inelastic neutron scattering experiments. The high frequency and speed of the nutation wave can open new paths towards new ways of realizing ultrafast spin dynamics.
Roberta De Luca - One of the best experts on this subject based on the ideXlab platform.
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double diffusive soret convection phenomenon in porous media effect of vadasz Inertia Term
Ricerche Di Matematica, 2019Co-Authors: Florinda Capone, Roberta De Luca, Maria VitielloAbstract:The onset of double-diffusive convection in horizontal porous layers for the thermo-diffusive Soret phenomenon in the case of a generalized Darcy model including Inertia Term is investigated. Via a linearization principle recently introduced in Rionero (Atti Accad Naz Lincei Rend Cl Sci Fis Mat Natur 28:21–47, 2017) the coincidence between linear and nonlinear (global) stability thresholds of the thermo-solutal conduction solution, is proved. Necessary and sufficient conditions guaranteeing the onset of steady or oscillatory convection in a closed algebraic form are obtained.
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porous mhd convection effect of vadasz Inertia Term
Transport in Porous Media, 2017Co-Authors: Florinda Capone, Roberta De LucaAbstract:The onset of porous convection in an electrically conducting fluid uniformly heated from below and embedded in an external transverse constant magnetic field is analysed. In particular the effect of Vadasz Inertia Term, measured through the Vadasz number \(V_a\), on the instability threshold, is investigated. For the three-dimensional perturbations and full nonlinear problem it is shown that sub-critical instabilities do not exist and the global nonlinear stability is guaranteed by the linear stability. The long-time behaviour is characterized via the existence of \(L^2\)-absorbing sets.
Maria Vitiello - One of the best experts on this subject based on the ideXlab platform.
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double diffusive soret convection phenomenon in porous media effect of vadasz Inertia Term
Ricerche Di Matematica, 2019Co-Authors: Florinda Capone, Roberta De Luca, Maria VitielloAbstract:The onset of double-diffusive convection in horizontal porous layers for the thermo-diffusive Soret phenomenon in the case of a generalized Darcy model including Inertia Term is investigated. Via a linearization principle recently introduced in Rionero (Atti Accad Naz Lincei Rend Cl Sci Fis Mat Natur 28:21–47, 2017) the coincidence between linear and nonlinear (global) stability thresholds of the thermo-solutal conduction solution, is proved. Necessary and sufficient conditions guaranteeing the onset of steady or oscillatory convection in a closed algebraic form are obtained.