Recherche

Afficher tous les résultats pour

Accueil

Personne

Jean-Philippe Ansermet

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (128)

Short-Wavelength Spin Waves in Yttrium Iron Garnet Micro-Channels on Silicon

Jean-Philippe Ansermet, Haiming Yu, Francesco Antonio Vetrò, Ping Che, Sa Tu, Yao Zhang

Yttrium iron garnet (YIG) has been widely used in spin wave studies thanks to its low Gilbert damping constant. However, most high-quality YIG films are grown on gadolinium gallium garnet (GGG) substrate, which makes it difficult to integrate with existing ...

Ieee-Inst Electrical Electronics Engineers Inc2016

Surface States Transport in Topological Insulator Bi0.83Sb0.17 Nanowires

Jean-Philippe Ansermet

We investigate the transport properties of topological insulator (TI) nanowires. Single-crystal nanowire samples with diameters ranging from 75 nm to 1.1 m are prepared using high frequency liquid phase casting in a glass capillary; cylindrical single crys ...

Springer Verlag2016

Quantum molecular master equations

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

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, Klaus Maschke, François Reuse, Sylvain Bréchet

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

Linear response to a heat-driven spin torque

Jean-Philippe Ansermet, Lucas Fitoussi, Haiming Yu, Francesco Antonio Vetrò, Christian Caspers

The existence of a heat-driven spin torque is demonstrated using Co/Cu/Co spin valves embedded in metallic nanowires. Heat currents flowing in one direction or its opposite were obtained by heating optically one end or the other of the nanowires. The spin ...

Amer Inst Physics2015

Buffer influence on magnetic dead layer, critical current, and thermal stability in magnetic tunnel junctions with perpendicular magnetic anisotropy

Jean-Philippe Ansermet

We present a detailed study of Ta/Ru-based buffers and their influence on features crucial from the point of view of applications of Magnetic Tunnel Junctions (MTJs) such as critical switching current and thermal stability. We study buffer/FeCoB/MgO/Ta/Ru ...

Amer Inst Physics2015

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

Opto-spintronics in InP using ferromagnetic tunnel spin filters

Jean-Philippe Ansermet, Murari Soundararajan, Dongyoung Yoon, Christian Caspers

We demonstrate opto-spintronics using Fe-doped Indium Phosphide (InP). The method is based on optical orientation of InP conduction electron spins which are electrically detected in planar InP/oxide/Ni tunnel spin filters. We separate the optical excitatio ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2015

Nuclear polarization by optical pumping in InP:Fe above liquid nitrogen temperature

Jean-Philippe Ansermet, Murari Soundararajan, Dongyoung Yoon

Hyperpolarized nuclear spins are observed in optically pumped iron-doped InP from 70 K to 140 K. P-31 NMR was carried out at 9.28 T (159.8 MHz) during optical excitation with circularly polarized light, using a laser diode (lambda-830 nm) as a source. The ...

Academic Press Inc Elsevier Science2015

Establishing the Fundamental Magnetic Interactions in the Chiral Skyrmionic Mott Insulator Cu2OSeO3 by Terahertz Electron Spin Resonance

Jean-Philippe Ansermet, Helmuth Berger

The recent discovery of Skyrmions in Cu2OSeO3 has established a new platform to create and manipulate Skyrmionic spin textures. We use high-field electron spin resonance with a terahertz free-electron laser and pulsed magnetic fields up to 64 T to probe an ...

Amer Physical Soc2014

Electrical detection of spin hyperpolarization in InP

Jean-Philippe Ansermet, Christian Caspers

The electrical detection of surface spin polarization in Indium Phosphide (InP) is demonstrated. Using a planar four-terminal architecture on top of semi-insulating Fe: InP (001) wafers, optical orientation is separated from electrical detection. Spin filt ...

Amer Inst Physics2014

Time-resolved spin processes in Alq(3) light-emitting diodes

Jean-Philippe Ansermet, Francesco Comandè

Using pulsed electroluminescence detected magnetic resonance (PELDMR), we study the dynamics of spin processes in Alq(3) based light-emitting diodes. The transitions induced by magnetic resonance are found to be much faster than the space charge reaction t ...

Amer Physical Soc2014

Nanosecond Pulses in a THz Gyrotron Oscillator Operating in a Mode-Locked Self-Consistent Q-Switch Regime

Stefano Alberti, Jean-Philippe Ansermet, Minh Quang Tran, Trach-Minh Tran, Jean-Philippe Hogge, Jérémy Genoud

An experimental study of a nanosecond pulsed regime in a THz gyrotron oscillator operating in a self-consistent Q-switch regime has been carried out. The gyrotron is operated in the TE7,2 transverse mode radiating at a frequency of 260.5 GHz. The 5 W nanos ...

Amer Physical Soc2013

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, Elisa Papa, Francesco Antonio Vetrò

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

Transverse spin penetration length in metallic spin valves

Jean-Philippe Ansermet

A semiclassical description of diffusive spin transport in spin valves, which takes into account the transverse components of spin accumulation, is used to calculate the second harmonic voltage response to a low-frequency current. The description is applie ...

American Institute of Physics2013

Thermodynamics of continuous media with intrinsic rotation and magnetoelectric coupling

Jean-Philippe Ansermet, Sylvain Bréchet

The thermodynamics of an electrically charged, multicomponent continuous medium with intrinsic rotation is analysed in the presence of electromagnetic fields with a weak linear magnetoelectric coupling in the non-relativistic limit. Taking into account the ...

Springer Verlag2013

Local Excitation of Magnetostatic Modes in YIG

Jean-Philippe Ansermet, Elisa Papa

Described are ferromagnetic resonance (FMR) studies of the long wavelength magnetostatic wave modes of a single crystal yttrium iron garnet (YIG) slab magnetized by an in-plane field. A resonant circuit comprising a coil, 50 m in diameter, is used to excit ...

Institute of Electrical and Electronics Engineers2013

Thermodynamics of a continuous medium with electric and magnetic dipoles

Jean-Philippe Ansermet, Sylvain Bréchet

The thermodynamics of an electrically charged, multicomponent fluid with spontaneous electric and magnetic dipoles is analysed in the presence of electromagnetic fields. Taking into account the chemical composition of the current densities and stress tenso ...

EDP Sciences, Springer2013

Page 4 sur 7