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Dive into the research topics where Pascal Aubert is active.

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Featured researches published by Pascal Aubert.


Nature Communications | 2013

Strain-controlled magnetic domain wall propagation in hybrid piezoelectric/ferromagnetic structures

Na Lei; T. Devolder; Guillaume Agnus; Pascal Aubert; Laurent Daniel; Joo-Von Kim; Weisheng Zhao; Theodossis Trypiniotis; Russell P. Cowburn; C. Chappert; D. Ravelosona; Philippe Lecoeur

The control of magnetic order in nanoscale devices underpins many proposals for integrating spintronics concepts into conventional electronics. A key challenge lies in finding an energy-efficient means of control, as power dissipation remains an important factor limiting future miniaturization of integrated circuits. One promising approach involves magnetoelectric coupling in magnetostrictive/piezoelectric systems, where induced strains can bear directly on the magnetic anisotropy. While such processes have been demonstrated in several multiferroic heterostructures, the incorporation of such complex materials into practical geometries has been lacking. Here we demonstrate the possibility of generating sizeable anisotropy changes, through induced strains driven by applied electric fields, in hybrid piezoelectric/spin-valve nanowires. By combining magneto-optical Kerr effect and magnetoresistance measurements, we show that domain wall propagation fields can be doubled under locally applied strains. These results highlight the prospect of constructing low-power domain wall gates for magnetic logic devices.


Microscopy and Microanalysis | 2010

A multiscale approach to assess the complex surface of polyurethane catheters and the effects of a new plasma decontamination treatment on the surface properties.

Omar Mrad; Johanna Saunier; Caroline Aymes-Chodur; Véronique Rosilio; Sylvie Bouttier; Florence Agnely; Pascal Aubert; Jacky Vigneron; Arnaud Etcheberry; Najet Yagoubi

Polyurethane catheters made of Pellethane 2363-80AE® were treated with a low temperature plasma developed for the decontamination of reusable polymer devices in hospitals. We investigated the modifications of the polymer surface by studying the topographic modifications, the chemical modifications, and their consequences on the wettability and bacterial adhesion. This study showed that plasma treatment modified the topography and grafted oxygen and nitrogen species onto the surface, resulting in an increase in the surface polarity. This effect could be correlated to the number of nitrogen atoms interacting with the surface. Moreover, this study demonstrated the significance of multiscale heterogeneities, and the complexity of industrial medical devices made from polymers. Their surface can be heterogeneous, and they contain additives that can migrate and change the surface composition.


Scientific Reports | 2015

Memristive and neuromorphic behavior in a Li x CoO 2 nanobattery

Van Huy Mai; Alec Moradpour; P. Auban Senzier; Claude Pasquier; Kang Wang; Marcelo Rozenberg; J. Giapintzakis; C. N. Mihailescu; C M Orfanidou; Efthymios Svoukis; A. Breza; Ch B. Lioutas; Sylvain Franger; A. Revcolevschi; Thomas Maroutian; P. Lecoeur; Pascal Aubert; Guillaume Agnus; Raphaël Salot; Pierre-Antoine Albouy; Raphaël Weil; David Alamarguy; Katia March; F. Jomard; Pascal Chrétien; Olivier Schneegans

The phenomenon of resistive switching (RS), which was initially linked to non-volatile resistive memory applications, has recently also been associated with the concept of memristors, whose adjustable multilevel resistance characteristics open up unforeseen perspectives in cognitive computing. Herein, we demonstrate that the resistance states of LixCoO2 thin film-based metal-insulator-metal (MIM) solid-state cells can be tuned by sequential programming voltage pulses, and that these resistance states are dramatically dependent on the pulses input rate, hence emulating biological synapse plasticity. In addition, we identify the underlying electrochemical processes of RS in our MIM cells, which also reveal a nanobattery-like behavior, leading to the generation of electrical signals that bring an unprecedented new dimension to the connection between memristors and neuromorphic systems. Therefore, these LixCoO2-based MIM devices allow for a combination of possibilities, offering new perspectives of usage in nanoelectronics and bio-inspired neuromorphic circuits.


International Journal of Pharmaceutics | 2013

Modification of a cyclo-olefin surface by radio-sterilization: Is there any effect on the interaction with drug solutions?

Hala Barakat; Johanna Saunier; Caroline Aymes Chodur; Pascal Aubert; Jackie Vigneron; Arnaud Etcheberry; Najet Yagoubi

A cyclo-olefin copolymer was subjected to an e-beam ionizing treatment. Two doses were studied: one corresponding to the recommended dose for the sterilization of pharmaceutical packaging (25 kGy), and a greater one to enhance the modifications caused by the treatment (150 kGy). The surface modifications were studied by X-ray photoelectron spectroscopy (XPS), contact angle measurements and atomic force microscopy (AFM). The roughness and the wettability of the surface were enhanced by the treatment. The consequences of the surface modifications on the drug interaction with the polymer were studied.


Small | 2018

Direct Evidence of Lithium Ion Migration in Resistive Switching of Lithium Cobalt Oxide Nanobatteries

Van Son Nguyen; Van Huy Mai; Pascale Auban Senzier; Claude Pasquier; Kang Wang; Marcelo Rozenberg; Nathalie Brun; Katia March; F. Jomard; J. Giapintzakis; C. N. Mihailescu; Evripides Kyriakides; Pavan Nukala; Thomas Maroutian; Guillaume Agnus; P. Lecoeur; Silvia Matzen; Pascal Aubert; Sylvain Franger; Raphaël Salot; Pierre-Antoine Albouy; David Alamarguy; Brahim Dkhil; Pascal Chrétien; Olivier Schneegans

Lithium cobalt oxide nanobatteries offer exciting prospects in the field of nonvolatile memories and neuromorphic circuits. However, the precise underlying resistive switching (RS) mechanism remains a matter of debate in two-terminal cells. Herein, intriguing results, obtained by secondary ion mass spectroscopy (SIMS) 3D imaging, clearly demonstrate that the RS mechanism corresponds to lithium migration toward the outside of the Lix CoO2 layer. These observations are very well correlated with the observed insulator-to-metal transition of the oxide. Besides, smaller device area experimentally yields much faster switching kinetics, which is qualitatively well accounted for by a simple numerical simulation. Write/erase endurance is also highly improved with downscaling - much further than the present cycling life of usual lithium-ion batteries. Hence very attractive possibilities can be envisaged for this class of materials in nanoelectronics.


Radiation Physics and Chemistry | 2010

A comparison of plasma and electron beam-sterilization of PU catheters

O. Mrad; Johanna Saunier; C. Aymes Chodur; V. Rosilio; Florence Agnely; Pascal Aubert; Jackie Vigneron; Arnaud Etcheberry; Najet Yagoubi


Journal of Alloys and Compounds | 2009

Nanoindentation analysis of the mechanical behavior of Zr-based metallic glasses with Sn, Ta and W additions

Sophie Nowak; P. Ochin; Alexandre Pasko; Olek Maciejak; Pascal Aubert; Yannick Champion


Vacuum | 2009

Nanomechanical measurements of irradiated layers: Methodology, possibilities and pitfalls

J. Jagielski; L. Thomé; Pascal Aubert; Olek Maciejak; Anna Piatkowska; Magdalena Romaniec; S. Moll


Journal of Alloys and Compounds | 2015

Theoretical investigation of new Heusler alloys Ru2VGa1−xAlx

Hamza Abbassa; Soria Hadjri-Mebarki; Bouhalouane Amrani; Tayeb Belaroussi; Kouider Driss Khodja; Pascal Aubert


arXiv: Materials Science | 2012

Electric field control of domain wall logic in piezoelec-tric/ferromagnetic nanodevices

Na Lei; T. Devolder; Guillaume Agnus; Pascal Aubert; Laurent Daniel; Joo-Von Kim; Weisheng Zhao; C. Chappert; D. Ravelosona; Philippe Lecoeur

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Guillaume Agnus

Centre national de la recherche scientifique

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Philippe Lecoeur

Centre national de la recherche scientifique

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Thomas Maroutian

Centre national de la recherche scientifique

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Van Huy Mai

Le Quy Don Technical University

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Kang Wang

University of Paris-Sud

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