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Jean-Philippe Ansermet

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Publications associées (128)

Magnon-polaritons in dysprosium ferrite

Jean-Philippe Ansermet, Arnaud Magrez, Marcin Bialek

Coupling of magnons with cavity photons at THz frequencies is reported in an antiferromagnet dysprosium ferrite (DyFeO3). ...

IEEE2019

Terahertz-optical properties of a bismuth ferrite single crystal

Jean-Philippe Ansermet, Henrik Moodysson Rønnow, Marcin Bialek

Transmission through a (100)-oriented single crystal of bismuth ferrite (BiFeO3) was studied at frequencies of 0.485-0.765 THz with a continuous-wave source and in the temperature range of 30-350 K as a function of polarization angle. The fine splitting of ...

2019

Field- and temperature-modulated spin diode effect in a GMR nanowire with dipolar coupling

Jean-Philippe Ansermet, Francesco Antonio Vetrò

The magnetization dynamics of single Co/Cu/Co spin valves, embedded in electrodeposited nanowires of 30 nm avarage diameter, was observed using the spin-diode effect. The electrically-detected magnetic resonances were compared when using modulation of eith ...

2019

Spin thermoelectrics

Jean-Philippe Ansermet, Haiming Yu

ELSEVIER2019

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

Large magnetothermopower and anomalous Nernst effect in HfTe5

Jean-Philippe Ansermet, Helmuth Berger, Arnaud Magrez, Haiming Yu, Jan Hugo Dil, Edoardo Martino, Sa Tu, Marco Caputo, Junfeng Hu

Topological quantum materials have stimulated growing attention because they reveal novel aspects of condensed matter physics and point to new opportunities in materials science, in particular for thermoelectrics. Here, we experimentally study thermoelectr ...

AMER PHYSICAL SOC2019

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

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

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

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

High-Field Liquid-State Dynamic Nuclear Polarization in Microliter Samples

Stefano Alberti, Jean-Philippe Ansermet, Emile Jacques de Rijk, Jérémy Genoud

2018

Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy (vol 111, 222401, 2017)

Jean-Philippe Ansermet, Haiming Yu, Xiangrong Wang, Sa Tu, Junfeng Hu, Jianyu Zhang, Yao Zhang

AMER INST PHYSICS2018

Spin-wave resonances in bismuth orthoferrite at high temperatures

Jean-Philippe Ansermet, Arnaud Magrez, Marcin Bialek

Spin-wave resonances in pelletized powder of bismuth orthoferrite (BiFeO3) were studied in transmission spectroscopy at frequencies of 0.1–0.75 THz and in the temperature range of 300–650 K. A vector network analyzer with frequency extenders was used in co ...

2018

Anomalous Hall and Nernst Effects in Co2TiSn and Co2Ti0.6V0.4Sn Heusler Thin Films

Jean-Philippe Ansermet, Haiming Yu, Sa Tu, Junfeng Hu, Yao Zhang

Magnetotransport (magnetoresistance and anomalous Hall effect) and thermoelectric (Seebeck and anomalous Nernst effect) effects are investigated on epitaxially grown Co2TiSn and Co2Ti0.6V0.4Sn Heusler thin films. An anomalous Nernst coefficient up to 1.8 m ...

American Physical Society (APS)2018

Polymer-Based Additive Manufacturing of High-Performance Waveguide and Antenna Components

Jean-Philippe Ansermet, Emile Jacques de Rijk, Mathieu Billod, Tomislav Debogovic

In this paper, a lightweight horn antenna array demonstrator is designed and fabricated by means of an additive manufacturing (AM) process that has been optimized for complicated passive radio-frequency (RF) components. The presented design comprises a com ...

Ieee-Inst Electrical Electronics Engineers Inc2017

Thermal spin torques in magnetic insulators

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

Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy

Jean-Philippe Ansermet, Haiming Yu, Xiangrong Wang, Sa Tu, Junfeng Hu, Jianyu Zhang, Yao Zhang

The anomalous Nernst effect in a perpendicularly magnetized Ir22Mn78/Co20Fe60B20/MgO thin film is measured using well-defined in-plane temperature gradients. The anomalous Nernst coefficient reaches 1.8 mu V/K at room temperature, which is almost 50 times ...

American Institute of Physics2017

Bolometric detection of ferromagnetic resonance in YIG slab

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

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

Estimation of transverse spin penetration length using second-harmonic measurement: Proposal of an experimental method

Jean-Philippe Ansermet

A theoretical description of spin current injection from a nonmagnetic layer into a magnetic one is presented, with the main emphasis on the description and determination of the penetration depth of spin current component transverse to the magnetization. T ...

Amer Physical Soc2016

Dynamic nuclear polarization by frequency modulation of a tunable gyrotron of 260 GHz

Stefano Alberti, Jean-Philippe Ansermet, Philippe Cuanillon, Falk Hans Braunmüller, Murari Soundararajan, Dongyoung Yoon

An increase in Dynamic Nuclear Polarization (DNP) signal intensity is obtained with a tunable gyrotronproducing frequency modulation around 260 GHz at power levels less than 1W. The sweep rate of frequency modulation can reach 14 kHz, and its amplitude is ...

Academic Press2016

Sub-terahertz spectroscopy of magnetic resonance in BiFeO3 using a vector network analyzer

Jean-Philippe Ansermet, Arnaud Magrez, Emile Jacques de Rijk, Christian Caspers, Varun Paresh Gandhi

Detection of sub-THz spin cycloid resonances (SCRs) of stoichiometric BiFeO3 (BFO) was demonstrated using a vector network analyzer. Continuous wave absorption spectroscopy is possible, thanks to heterodyning and electronic sweep control using frequency ex ...

Amer Inst Physics2016

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