Publications de Jean-Philippe Ansermet

Coherent magnon transport in a van der Waals antiferromagnet

Recently developed van der Waals magnets offer a promising platform for advancing spintronics. The weak interlayer antiferromagnetic exchange coupling in van der Waals antiferromagnets allows for unique spin dynamics and control over magnons. In this study ...

AIP Publishing2025

Long-range propagation of magnon polaritons in a canted antiferromagnet

Jean-Philippe Ansermet

American Physical Society (APS)2025

Deterministic switching of antiferromagnetic spin textures by nonlinear magnons

Jean-Philippe Ansermet, Dirk Grundler, Mohammad Hamdi, Mingran Xu

Antiferromagnetic spin textures, compared to their ferromagnetic counterparts, innately possess high stability with respect to external disturbance and high-frequency dynamics compatible with ultrafast information processing. However, deterministic creatio ...

DIN Media GmbH2025

Coupling between electrons’ spin and proton transfer in chiral biological crystals

Jean-Philippe Ansermet

Proton transport plays a fundamental role in many biological and chemical systems. In life, proton transport is crucial for biochemical and physiological functions. It is usually accepted that the main mechanism of proton transfer is a result of hopping be ...

Proceedings of the National Academy of Sciences2025

Control of spin currents by magnon interference in a canted antiferromagnet

Jean-Philippe Ansermet, Dirk Grundler, Keita Yamamoto, Peng Chen, Junfeng Hu

Controlling the spin current lies at the heart of spintronics and its applications. In ferromagnets, the sign of spin currents is fixed once the current direction is determined. However, spin currents in antiferromagnets can possess opposite polarizations, ...

Springer Science and Business Media LLC2025

Observation of Coherent Gapless Magnons in an Antiferromagnet

Jean-Philippe Ansermet

Antiferromagnetic magnons possess high speed and are immune to external disturbance, making them promising for future magnonic circuits. In this Letter, we report the observation of gapless magnons in an easy-axis antiferromagnet alpha-Fe2O3 at low tempera ...

AMER PHYSICAL SOC2025

Magnon gap excitations in van der Waals antiferromagnet MnPSe3

Jean-Philippe Ansermet

Magneto-spectroscopy methods have been employed to study the zero-wavevector magnon excitations in MnPSe3. Experiments carried out as a function of temperature and the applied magnetic field show that two low-energy magnon branches of MnPSe3 in its antifer ...

Nature Research2024

Enhancement of electrocatalysis through magnetic field effects on mass transport

Jean-Philippe Ansermet, Magalí Alejandra Lingenfelder, Yunchang Liang

Magnetic field effects on electrocatalysis have recently gained attention due to the substantial enhancement of the oxygen evolution reaction (OER) on ferromagnetic catalysts. When detecting an enhanced catalytic activity, the effect of magnetic fields on ...

Nature Portfolio2024

Broad-wave-vector spin pumping of flat-band magnons

Jean-Philippe Ansermet

We report the experimental observation of large spin -pumping signals in the YIG/Pt system driven by broad -wave -vector spin -wave spin current. 280-nm-wide microwave inductive antennas offer broad -wavevector excitation, which, in combination with the qu ...

American Physical Society (APS)2024

Long-distance coherent propagation of magnon polarons in a ferroelectric-ferromagnetic heterostructure

Jean-Philippe Ansermet, Haiming Yu, Peng Chen, Jilei Chen, Jianyu Zhang, Yao Zhang, Song Liu, Jinlong Wang

We experimentally demonstrate the coherent propagation of magnon polarons, the hybridized excitations formed by the coupling of spin waves and Rayleigh/Love surface acoustic waves, in a heterostructure consisting of ferroelectric BaTiO3 and ferromagnetic L ...

Amer Physical Soc2023