Home

Person

Jean-Philippe Ansermet

About
Privacy
Disclaimer

Graph Chatbot

Related publications (126)

Page 3 of 7

Antiferromagnetic resonance in a-Fe2O3 up to its Neel temperature

Jean-Philippe Ansermet, Haiming Yu, Marcin Bialek

Hematite (alpha-Fe2O3) is an antiferromagnetic material with a very low spin damping and high Neel temperature. The temperature dependence of the antiferromagnetic resonance in a bulk single crystal of hematite was characterized from room temperature up to ...

AIP Publishing2022

Optically Enhanced Solid-State H-1 NMR Spectroscopy

David Lyndon Emsley, Jean-Philippe Ansermet, Aaron James Rossini, Dominik Józef Kubicki, Jonas Milani, Aditya Mishra, Gabriele Stevanato, Michael Allan Hope, Claudia Esther Avalos, Federico De Biasi, Saumya Badoni

Low sensitivity is the primary limitation to extendingnuclearmagnetic resonance (NMR) techniques to more advanced chemical andstructural studies. Photochemically induced dynamic nuclear polarization(photo-CIDNP) is an NMR hyperpolarization technique where ...

AMER CHEMICAL SOC2023

Probing charge transfer processes at p-GaAs electrodes under weak optical excitation

Jean-Philippe Ansermet, Christophe Roussel, Mika Antero Tamski, Felix Blumenschein

The p-GaAs photocathode/acetonitrile interface was characterised in the dark and with tens of mu W/cm(2) laser powers at 830 nm wavelength, using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Two redox mediators were used that p ...

2019

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

Helmuth Berger, Jean-Philippe Ansermet

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

Magnetoelectric Ponderomotive Force

Jean-Philippe Ansermet, Sylvain Bréchet

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

High-Field C-13 Dynamic Nuclear Polarization in Nanodiamond

Stefano Alberti, Jean-Philippe Ansermet, Serguei Sekatski, Jérémy Genoud, Murari Soundararajan, Dongyoung Yoon

Hyperpolarization in diamond via dynamic nuclear polarization (DNP) has attracted a lot of interest for various applications as diamond exhibits extremely long C-13 spin relaxation times and has endogenous polarizing agents in the form of crystalline defec ...

2019

Hybridized propagating spin waves in a CoFeB/IrMn bilayer

Jean-Philippe Ansermet

In this work, we report the propagating spin waves hybridized between first-order and quasiuniform modes in a Co20Fe60B20 thin film capped by Ir25Mn75. The anticrossing gaps are observed at room temperature both in the reflection and transmission spectra, ...

AMER PHYSICAL SOC2022

Evidence for Thermal Spin-Transfer Torque

Jean-Philippe Ansermet, Haiming Yu, Simon Granville

Large heat currents are obtained in Co/Cu/Co spin valves positioned at the middle of Cu nanowires. The second harmonic voltage response to an applied current is used to investigate the effect of the heat current on the switching of the spin valves. Both th ...

American Physical Society2010

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

Anomalous Nernst effect in Co2MnGa thin films with perpendicular magnetic anisotropy

Jean-Philippe Ansermet, Haiming Yu, Simon Granville, Junfeng Hu, Sa Tu

The thermoelectric and transport properties of MgO/Co2MnGa/Pd stacks with perpendicular magnetic anisotropy were measured. For a nominal 3.3 nm Co2MnGa thickness, the anomalous Nernst coefficient and the Nernst angle at room temperature were found to be 0. ...

ELSEVIER2020

Bolometric detection of ferromagnetic resonance in YIG slab

Jean-Philippe Ansermet, Haiming Yu, Marcin Bialek, Sa Tu

The resistance of the Pt bar deposited on the YIG slab was monitored while the magnetic field was ramped through the ferromagnetic resonance with the YIG slab facing a coplanar waveguide resonator excited at 4.3 GHz excitation. The resistance change provid ...

Elsevier2017

Thermal spin torques in magnetic insulators

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

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

THz-waves channeling in a monolithic saddle-coil for Dynamic Nuclear Polarization enhanced NMR

Stefano Alberti, Jean-Philippe Ansermet, Emile Jacques de Rijk, Alessandro Macor

A saddle coil manufactured by electric discharge machining (EDM) from a solid piece of copper has recently been realized at EPFL for Dynamic Nuclear Polarization enhanced Nuclear Magnetic Resonance experiments (DNP-NMR) at 9.4 T. The corresponding electrom ...

Academic Press Inc - Elsevier Science2011

Spin-dependent transport in cluster-assembled nanostructures: influence of cluster size and matrix material

Jean-Philippe Ansermet, Santiago Serrano Guisan, Giulia Di Domenicantonio

Spin-dependent transport in granular metallic nanostructures has been investigated by means of a thermoelectric measurement. Cobalt clusters of well-defined size ( = 15 and 600), embedded in copper and silver matrices, show magnetic field responses of u ...

EDP Sciences, Springer2007

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

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

Current-induced magnetization switching in pseudo spin-valves

Jean-Philippe Ansermet, Santiago Serrano Guisan

The spin transfer torque model applied in the context of a Fokker-Planck analysis (Li and Zhang 2004 Phys. Rev. B 69 134416) is shown to account for a complete set of statistical data for switching times obtained with pseudo spin-valves (Fabian et al 2003 ...

Institute of Physics2006

Blatter-type radicals as polarizing agents for electrochemical overhauser dynamic nuclear polarization

Jean-Philippe Ansermet, Holger Frauenrath, Christophe Roussel, Jonas Milani, Mika Antero Tamski, Felipe Andres Saenz Padilla

Overhauser dynamic nuclear polarization (O-DNP) refers to a microwave-assisted process where an unpaired electron's (e.g. a radical) spin polarization is transferred to surrounding nuclei in solution, thus increasing the nuclear magnetic resonance (NMR) si ...

Royal Society of Chemistry2022

Magnetoelectric effects in single crystals of the cubic ferrimagnetic helimagnet Cu2OSeO3

Helmuth Berger, Jean-Philippe Ansermet

We present magnetodielectric measurements in single crystals of the cubic spin-1/2 compound Cu2OSeO3. A magnetic-field-induced electric polarization (P) and a finite magnetocapacitance (MC) is observed at the onset of the magnetically ordered state (T-c = ...

2012

Preparation and Properties of Cobalt Doped ZnO Nanowires

Jean-Philippe Ansermet, Simon Granville

The template method was used for preparing Zn1-xCoxO nanowires with x ranging from 0.01 to 0.05. Thus, electrochemical deposition was employed for filling up the pores of polycarbonate ion track nanoporous membranes with the desired material. The method al ...

Institute of Electrical and Electronics Engineers2008