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Jean-Philippe Ansermet

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Publications associées (126)

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Switching field modulation of a nanomagnet by resonant microwave spin torque

Jean-Philippe Ansermet, Elena Murè

We report on the effect of a low amplitude microwave current on the switching field of magnetic layers in a 40 nm diameter pseudo-spin valve grown by template synthesis. We show a frequency dependence at room temperature reflecting the dynamic behavior of ...

2010

Reconfigurable nonreciprocal excitation of propagating exchange spin waves in perpendicularly magnetized yttrium iron garnet thin films

Jean-Philippe Ansermet, Haiming Yu, Peng Chen

We report the nonreciprocal excitation of propagating forward volume exchange spin waves in yttrium iron garnet (YIG) thin film with perpendicular anisotropy by bringing the in-plane magnetization of Co20Fe60B20 (CoFeB) nanowires to resonance. All-electric ...

Amer Physical Soc2023

Spin Evolution in the Born-Oppenheimer Approximation

Jean-Philippe Ansermet, François Reuse, Klaus Maschke

The first part of this article attempts to highlight in chronological order some prominent papers that have direct connexion with the Born-Oppenheimer approximation. This timeline successively points to the role of level crossing, the notions of gauge fiel ...

WILEY-V C H VERLAG GMBH2022

Strong temperature-dependent thermoelectric power of IrMn(3)thin films of different thicknesses

Jean-Philippe Ansermet, Haiming Yu, Junfeng Hu

IrMn(3)thin films were experimentally characterized by thermoelectric power and resistivity as a function of temperature and sample thickness. The Seebeck coefficient shows strong temperature dependence and the value increases with temperature up to 350 K. ...

IOP PUBLISHING LTD2021

Template Nanowires for Spintronics Applications: Nanomagnet Microwave Resonators Functioning in Zero Applied Magnetic Field

Jean-Philippe Ansermet, Oleg Yazyev

Low-cost spintronic devices functioning in zero applied magnetic field are required for bringing the idea of spin-based electronics into the real-world industrial applications. Here we present first microwave measurements performed on nanomagnet devices fa ...

American Chemical Society (ACS)2008

Heat and spin transport in magnetic nanowires

Jean-Philippe Ansermet, Haiming Yu, Simon Granville

Transport measurements are carried out in which temperature oscillation is applied to magnetic nanostructures. Using spin valves, this measurement reveals aspects of the spin transport in non-collinear configurations. In one implementation, an AC voltage i ...

Elsevier2010

Linear response to a heat-driven spin torque

Jean-Philippe Ansermet, 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

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

Temperature derivative of the resistance of spin valves

Jean-Philippe Ansermet, Haiming Yu, Simon Granville

Spin-dependent transport properties of nanowires containing individual Co/Cu/Co pseudo-spin valves were investigated by monitoring an AC voltage induced by a temperature oscillation under a continuous DC current. We observed sharp peaks in the field-depend ...

Elsevier2010

Spin-dependent charge transfer at chiral electrodes probed by magnetic resonance

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

Chirality-induced spin selectivity is evidenced by exciting the spin resonance of radicals in an electrochemical cell where the working electrode is covered with a chiral self-assembled monolayer. Because the electron transfer to and from the paramagnetic ...

ROYAL SOC CHEMISTRY2020

Biexciton emission and crystalline quality of ZnO nano-objects

Jean-Philippe Ansermet, Pierre Stadelmann, Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Pierre Michel Corfdir, Anas Mouti, Elisa Papa

The design of cost-effective standards for the quality of nano-objects is currently a key issue toward their massive use for optoelectronic applications. The observation by photoluminescence of narrow excitonic and biexcitonic emission lines in semiconduct ...

Institute of Physics2011

Cavity-Mediated Coupling of Terahertz Antiferromagnetic Resonators

Jean-Philippe Ansermet, Marcin Bialek

Coupling of space-separated resonators is interesting for quantum and communication technologies. In this work, we show that antiferromagnetic resonance in separated parallel-plane slabs of hematite (alpha-Fe2O3) couple cooperatively to terahertz electroma ...

American Physical Society (APS)2023

Thermoelectrical study of ferromagnetic nanowire structures

Jean-Philippe Ansermet, Santiago Serrano Guisan

The mixed effects of heat and charge transports have been studied at room temperature for NiCu and CoCu multilayers with currents perpendicular to the interfaces as well as Ni and Co homogeneous nanowires. In order to carry out this analysis, magnetothermo ...

American Institute of Physics2006

Second-harmonic response and temperature differential resistivity of noncollinear spin valves

Jean-Philippe Ansermet

By means of a diffusive description of spin-dependent thermal and electrical transport using Pauli-spin matrices, we analyze the spin-dependent transport mechanisms that determine the voltage response of a metallic spin valve to an ac temperature oscillati ...

2008

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

Magic-angle magnonic nanocavity in a magnetic moiré superlattice

Jean-Philippe Ansermet, Haiming Yu

Moiré superlattices have recently been extensively studied in both electronic and photonic systems, e.g., magic-angle bilayer graphene showing superconductivity and twisted bilayer photonic crystals leading to magic-angle lasers. However, the moiré physics ...

AMER PHYSICAL SOC2022

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

Nanowires Networks for Biomolecular Detection using Contactless Impedance Tomoscopy Technique

Hubert Girault, Jean-Philippe Ansermet, Jean-Pierre Abid

Here we present the detection of ultralow concentrations of biomolecules in a device made from a polycarbonate membrane containing a network of gold nanowires and using a “contactless” impedance tomoscopy technique. The sensor comprises a thin dielectric l ...

2006

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