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Jean-Philippe Ansermet

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Related publications (128)

Current susceptibility of magnetization in spin valves

Jean-Philippe Ansermet, Simon Granville, Haiming Yu, Julie Dubois

We observed the second harmonic voltage response of pseudo-spin valves subjected to currents oscillating at frequencies in the sub-kilohertz range. Peaks appear in its magnetic field dependence, with a signal-to-noise ratio equal to or greater than the mag ...

2009

Microwave spin-torque excitation in a template-synthesized nanomagnet

Jean-Philippe Ansermet, Elena Murè

A microwave-compatible lithography-free process is shown to allow the electrical contact of a single nanometric spin valve grown by template synthesis. The complex spin dynamics of a single nanomagnet is revealed by resonant microwave current excitations, ...

2009

Long-lived states to sustain hyperpolarized magnetization

Arnaud Comment, Jean-Philippe Ansermet, Geoffrey Bodenhausen, Sami Jannin, Riddhiman Sarkar, Paul Romeo Vasos, Puneet Ahuja

Major breakthroughs have recently been reported that can help overcome two inherent drawbacks of NMR: the lack of sensitivity and the limited memory of longitudinal magnetization. Dynamic nuclear polarization (DNP) couples nuclear spins to the large reserv ...

National Academy of Sciences2009

Charge trapping effects in photovoltage measurements of (Ga,Mn)As

Jean-Philippe Ansermet, Simon Granville

We report charge trapping effects in a ferromagnetic (Ga,Mn)As thin film observed during measurements of the photovoltage under inhomogeneous illumination conditions. Using a laser diode as the excitation source, the temperature-dependent response has been ...

2008

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

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

Jean-Philippe Ansermet, Julie Dubois

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

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

Thermodynamic description of spin mixing in spin-dependent transport

Jean-Philippe Ansermet

This paper applies nonequilibrium thermodynamics in the linear regime to describe spin diffusion and magnetoresistance effects and to examine the effect of spin mixing on transport through collinear magnetic layers. To demonstrate the method, it treats ana ...

Institute of Electrical and Electronics Engineers2008

Correspondence "Origin of the magneto–thermogalvanic voltage in cluster-assembled metallic nanostructures"

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

2008

Spin mixing processes in magnetic nanostructures detected by thermoelectric measurements

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

Spin-dependent transport properties of magnetic nanostructures have been investigated by means of magneto-thermogalvanic voltage measurements: the ac voltage response to an ac temperature oscillation is measured for various magnetic nanostructures under dc ...

IOP Publishing - EPL Association2007

ZnO:Mn:Cu nanowires prepared by template method

Jean-Philippe Ansermet

2007

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

The Nd–Mn exchange interaction in Nd

Jean-Philippe Ansermet

The Nd-Mn exchange interaction in Nd0.7Sr0.3MnO3 is considered by studying its influence on the Mn-55 spin-echo NMR lineshape and spin- spin relaxation time. It is seen that the interaction is of considerable strength well above the Nd spin ordering temper ...

2006

Evidence of high dissipation in magnetization reversal processes of five Co/Cu bilayers

Jean-Philippe Ansermet, Santiago Serrano Guisan

Heat and charge transport perpendicular to the plan in five Co/Cu stacks are studied using AC temperature gradients in the presence of a DC current. Large peaks in AC voltage response versus applied field are observed. This effect, measured only in reversi ...

Elsevier2006

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

Enhanced magnetic field sensitivity of spin-dependent transport in cluster-assembled metallic nanostructures

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

The emerging field of spintronics explores the many possibilities offered by the prospect of using the spin of the electrons for fast, nanosized electronic devices. The effect of magnetization acting on a current is the essence of giant or tunnel magnetore ...

Nature Publishing Group2006

Electrochemical synthesis and magnetic properties of CoFe2O4 nanowire arrays

Jean-Philippe Ansermet

We report the preparation and magnetic properties of Co2FeO4nanowires grown by electrodeposition inside the pores of anodic aluminum oxide (AAO). The synthesis requires two successive steps: the electrodeposition of fairly amorphous Fe-Co oxides or hydroxi ...

Electrochemical Society2006

Thermodynamic description of heat and spin transport in magnetic nanostructures

Jean-Philippe Ansermet, François Reuse, Santiago Serrano Guisan

2006

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

Magnetotransport properties depending on the nanostructure of Fe3O4 nanowires

Jean-Philippe Ansermet, Jean-Pierre Abid, Santiago Serrano Guisan, Sami Jannin

We have studied the magnetic behaviour of Fe3O4 nanowires (NWs) with two different diameter ranges, above 150 nm and below 60 nm, made by electrodeposition techniques into a polymeric template. The nanowires were characterized using various techniques, in ...

2006

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