Publications de Sylvain Bréchet

Onsager-Casimir reciprocal relations as a consequence of the equivalence between irreversibility and dissipation

The equivalence between irreversibility and dissipation entails that the Onsager reciprocal relations hold unconditionally, requiring the part of the phenomenological matrix describing dissipative phenomena to be symmetric. The antisymmetric part of the ph ...

Berlin2023

Heat-driven spin torques in antiferromagnets

Jean-Philippe Ansermet, Sylvain Bréchet, Marcin Bialek

A heat-driven magnetization damping, that is a linear function of a temperature gradient, is predicted in antiferromagnets by considering the sublattice dynamics subjected to a heat-driven spin torque. This points to the possibility of achieving a spin tor ...

2018

Magnetic Contribution to the Seebeck Effect

Jean-Philippe Ansermet, Sylvain Bréchet

2018

Thermal spin torques in magnetic insulators

Jean-Philippe Ansermet, Sylvain Bréchet, Ping Che, Haiming Yu, Yi Zhang, Sa Tu, Cheng Zhao, Francesco Antonio Vetrò, Yao Zhang

The damping of spin waves transmitted through a two-port magnonic device implemented on a yttrium iron garnet thin film is shown to be proportional to the temperature gradient imposed on the device. The sign of the damping depends on the relative orientati ...

Amer Physical Soc2017

Quantum molecular master equations

Jean-Philippe Ansermet, Sylvain Bréchet, François Reuse, Klaus Maschke

We present the quantum master equations for midsize molecules in the presence of an external magnetic field. The Hamiltonian describing the dynamics of a molecule accounts for the molecular deformation and orientation properties, as well as for the electro ...

American Physical Society2016

Quantum description of a rotating and vibrating molecule

Jean-Philippe Ansermet, Sylvain Bréchet, François Reuse, Klaus Maschke

A rigorous quantum description of molecular dynamics with a particular emphasis on internal observables is developed accounting explicitly for kinetic couplings between nuclei and electrons. Rotational modes are treated in a genuinely quantum framework by ...

Springer Verlag2015

Variational principle for magnetisation dynamics in a temperature gradient

Jean-Philippe Ansermet, Sylvain Bréchet

By applying a variational principle on a magnetic system within the framework of extended irreversible thermodynamics, we find that the presence of a temperature gradient in a ferromagnet leads to a generalisation of the Landau-Lifshitz equation with an ad ...

IOP Publishing - EPL Association2015

Magnetic Nernst effect

Jean-Philippe Ansermet, Sylvain Bréchet

The thermodynamics of irreversible processes in continuous media predicts the existence of a magnetic Nernst effect that results from a magnetic analog to the Seebeck effect in a ferromagnet and magnetophoresis occurring in a paramagnetic electrode in cont ...

World Scientific Publishing2015

Magnetoelectric Ponderomotive Force

Jean-Philippe Ansermet, Sylvain Bréchet, Alexandre Roulet

The dynamics of a system consisting of a matter continuum with a weak linear magnetoelectric coupling interacting with electromagnetic fields is examined on a local scale in a non-relativistic limit. A consistent expression for the internal energy of the s ...

World Scientific Publishing2013

Evidence for a Magnetic Seebeck Effect

Jean-Philippe Ansermet, Sylvain Bréchet, Francesco Antonio Vetrò, Elisa Papa

The irreversible thermodynamics of a continuous medium with magnetic dipoles predicts that a temperature gradient in the presence of magnetization waves induces a magnetic induction field, which is the magnetic analog of the Seebeck effect. This thermal gr ...

American Physical Society2013