Tuning decoherence with a voltage probe (2009)
Roulleau, P., Portier, F., Roche, P., Cavanna, A., Faini, G., Gennser, U., ...
We present an experiment where we tune the decoherence in a quantum interferometer using one of the simplest object available in the physic of quantum conductors : an ohmic contact. For that purpose,...
Magnetoresistance of antidot lattices with grain boundaries (2008)
Klinkhammer, S., Xu, Hengyi, Heinzel, T., Gennser, U., Faini, G., Ulysse, C., ...
The magnetotransport properties of antidot lattices containing artificially designed grain boundaries have been measured. We find that the grain boundaries broaden the commensurability resonances and...
Coupling efficiency for phase locking of a spin transfer oscillator to a microwave current (2008)
Georges, B., Grollier, J., Darques, M., Cros, V., Deranlot, C., Marcilhac, B., ...
The phase locking behavior of spin transfer nano-oscillators (STNOs) to an external microwave signal is experimentally studied as a function of the STNO intrinsic parameters. We extract the coupling...
Noise dephasing in the edge states of the Integer Quantum Hall regime (2008)
Roulleau, P., Portier, F., Roche, P., Cavanna, A., Faini, G., Gennser, U., ...
An electronic Mach Zehnder interferometer is used in the integer quantum hall regime at filling factor 2, to study the dephasing of the interferences. This is found to be induced by the electrical...
Boulle, O., Cros, V., Grollier, J., Pereira, L. G., Deranlot, C., Petroff, F., ...
The spin transfer torque (STT) can lead to steady precession of magnetization without any external applied field in magnetic spin valve where the magnetic layer have very different spin diffusion...
Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime (2007)
Roulleau, P., Portier, F., Roche, P., Cavanna, A., Faini, G., Gennser, U., ...
We have determined the finite temperature coherence length of edge states in the Integer Quantum Hall Effect (IQHE) regime. This was realized by measuring the visibility of electronic Mach-Zehnder...
Sirena, M., Bergeal, N., Lesueur, J., Faini, G., Bernard, R., Briatico, J., ...
High Tc Josephson nanoJunctions (HTc JnJ) made by ion irradiation have remarkable properties for technological applications. However, the spread in their electrical characteristics increases with the...
Boulle, O., Cros, V., Grollier, J., Pereira, L. G., Deranlot, C., Petroff, F., ...
The generation of oscillations in the microwave frequency range is one of the most important applications expected from spintronics devices exploiting the spin transfer phenomenon. We report...
Observation of $h/e$ conductance oscillations in disordered metallic $T_3$ network (2006)
Schopfer, F., Mallet, F., Naud, C., Faini, G., Mailly, D., Saminadayar, L., ...
We report on magnetotransport measurements performed on a large metallic two-dimensional $\mathcal{T}_{3}$ network. Superimposed on the conventional Altshuler-Aronov-Spivak (AAS) oscillations of...
Vila, L., Giraud, R., Thevenard, L., Lemaitre, A., Pierre, F., Dufouleur, J., ...
Mesoscopic transport measurements reveal a large effective phase coherence length in epitaxial GaMnAs ferromagnets, contrary to usual 3d-metal ferromagnets. Universal conductance fluctuations of...
Direct test of pairing fluctuations in the pseudogap phase of underdoped cuprates (2006)
Bergeal, N., Lesueur, J., Aprili, M., Faini, G., Contour, J. P., Leridon, B.
We report on a direct test of pairing fluctuations in the pseudogap regime of underdoped superconducting cuprates using a Josephson junction. In this experiment, the coupling between a rigid...
Jouault, B., Gryglas, M., Faini, G., Gennser, U., Cavanna, A., Baj, M., ...
A single impurity is used to probe the local density of states of a two-dimensional electron gas (2DEG) in a resonant tunneling experiment. The studies have been performed in the GaAs/AlAs/GaAs...
Spectroscopy of a single Si donor by the resonant tunnelling experiment (2006)
Baj, M., Gryglas, M., Jouault, B., Maude, D., Faini, G., Gennser, U., ...
Resonant tunnelling via single impurities placed in a single barrier was experimentally studied. The typically observed structures in the current-voltage characteristics seem to be paired. Such a...
High-Quality Planar high-T$_c$ Josephson Junctions (2005)
Bergeal, N., Grison, X., Lesueur, J., Faini, G., Aprili, M., Contour, J. P.
Reproducible high-T$_c$ Josephson junctions have been made in a rather simple two-step process using ion irradiation. A microbridge (1 to 5 $\mu$m wide) is firstly designed by ion irradiating a...
Giraud, R., Gryglas, M., Thevenard, L., Lemaître, A., Faini, G.
The large tunneling anisotropic magneto-resistance of a single $p^{++}$-(Ga,Mn)As/$n^{+}$-GaAs Zener-Esaki diode is evidenced in a perpendicular magnetic field over a large temperature and voltage...
High-Quality Planar high-Tc Josephson Junctions (2005)
Bergeal, N., Grison, X., Lesueur, J., Faini, G., Aprili, M., Contour, J. P.
Reproducible high-Tc Josephson junctions have been made in a rather simple two-step process using ion irradiation. A microbridge (1 to 5 ?m wide) is firstly designed by ion irradiating a...
Direct observation of domain-wall configurations transformed by spin currents (2005)
Klaui, M., Allenspach, R., Bischof, A., Bland, J. A. C., Faini, G., ...
Direct observations of current-induced domain-wall propagation by spin-polarized scanning electron microscopy are reported. Current pulses move head-to-head as well as tail-to-tail walls in...
Commensurability Effects in Hexagonal Antidot Lattices with Large Antidot Diameters (2005)
Meckler, S., Heinzel, T., Cavanna, A., Faini, G., Gennser, U., Mailly, D.
The observation of a novel type of commensurability resonance in two-dimensional, hexagonal antidot lattices is reported. These resonances have a classical character and occur at magnetic fields...
High-Quality Planar high-T$_c$ Josephson Junctions (2005)
Bergeal, N., Grison, X., Lesueur, J., Faini, G., Aprili, M., Contour, J. P.
Reproducible high-T$_c$ Josephson junctions have been made in a rather simple two-step process using ion irradiation. A microbridge (1 to 5 $\mu$m wide) is firstly designed by ion irradiating a...
High-Quality Planar high-T$_c$ Josephson Junctions (2005)
Bergeal, N., Grison, X., Lesueur, J., Faini, G., Aprili, M., Contour, J. P.
Reproducible high-T$_c$ Josephson junctions have been made in a rather simple two-step process using ion irradiation. A microbridge (1 to 5 $\mu$m wide) is firstly designed by ion irradiating a...
Observation of $h/e$ conductance oscillations in disordered metallic $T_3$ network (2004)
Schopfer, F., Mallet, F., Naud, C., Faini, G., Mailly, D., Saminadayar, L., ...
We report on magnetotransport measurements performed on a large metallic two-dimensional $\mathcal{T}_{3}$ network. Superimposed on the conventional Altshuler-Aronov-Spivak (AAS) oscillations of...
Acoustic Phonon-Assisted Resonant Tunneling via Single Impurities (2004)
Gryglas, M., Baj, M., Chenaud, B., Jouault, B., Faini, G., Cavanna, A.
We perform the investigations of the resonant tunneling via impurities embedded in the AlAs barrier of a single GaAs/AlGaAs heterostructure. In the $I(V)$ characteristics measured at 30mK, the...
Magnetization reversal by injection and transfer of spin: experiments and theory (2003)
Fert, A., Cros, V., Grollier, J., Jaffres, H., Hamzic, A., ...
Reversing the magnetization of a ferromagnet by spin transfer from a current, rather than by applying a magnetic field, is the central idea of an extensive current research. After a review of our...
Switching a spin-valve back and forth by current-induced domain wall motion (2003)
Grollier, J., Boulenc, P., Cros, V., Hamzic, A., Vaures, A., Fert, A., ...
We have studied the current-induced displacement of a domain wall (DW) in the permalloy (Py) layer of a Co/Cu/Py spin valve structure at zero and very small applied field. The displacement is in...
Field dependence of magnetization reversal by spin transfer (2002)
Grollier, J., Cros, V., Jaffres, H., Hamzic, A., George, J. M., Faini, G., ...
We analyse the effect of the applied field (Happl) on the current-driven magnetization reversal in pillar-shaped Co/Cu/Co trilayers, where we observe two different types of transition between the...
Switching the magnetic configuration of a spin valve by current induced domain wall motion (2002)
Grollier, J., Lacour, D., Cros, V., Hamzic, A., Vaures, A., Fert, A., ...
We present experimental results on the displacement of a domain wall by injection of a dc current through the wall. The samples are 1 micron wide long stripes of a CoO/Co/Cu/NiFe classical spin valve...
Fassbender, J., Poppe, S., Mewes, T., Mougin, A., Hillebrands, B., Engel, D., ...
He+ion irradiation is an excellent tool to modify the magnitude and direction of the exchange bias field on the sub- micrometer scale without affecting the sample topography. This effect has been...
Aharonov-Bohm cages in the GaAlAs/GaAs system (2001)
Naud, C., Faini, G., Mailly, D., Vidal, J., Doucot, B., Montambaux, G., ...
Aharonov-Bohm oscillations have been observed in a lattice formed by a two dimensional rhombus tiling. This observation is in good agreement with a recent theoretical calculation of the energy...
Kataoka, M., Ford, C. J. B., Faini, G., Mailly, D., Simmons, M. Y., Ritchie, D. A.
We consider single-electron tunnelling through antidot states using a Coulomb-blockade model, and give an explanation for h/2e Aharonov-Bohm oscillations, which are observed experimentally when the...
Detection of Coulomb Charging around an Antidot in the Quantum Hall Regime (1999)
Kataoka, M., Ford, C. J. B., Faini, G., Mailly, D., Simmons, M. Y., Mace, D. R., ...
We have detected oscillations of the charge around a potential hill (antidot) in a two-dimensional electron gas as a function of a large magnetic field B. The field confines electrons around the...
Detection of Coulomb Charging around an Antidot (1999)
Kataoka, M., Ford, C. J. B., Faini, G., Mailly, D., Simmons, M. Y., Mace, D. R., ...
We have detected oscillations of the charge around a potential hill (antidot) in a two-dimensional electron gas as a function of a perpendicular magnetic field B. The field confines electrons around...
Holder, J. P., Savchenko, A. K., Fal'ko, Vladimir I., Jouault, B., Faini, G., Laruelle, F., ...
We have found that the local density of states fluctuations (LDOSF) in a disordered metal, detected using an impurity in the barrier as a spectrometer, undergo enhanced (with respect to SdH and dHvA...
Photocurrent near-field microscopy of Schottky barriers (1999)
Coluzza, C., Di Claudio, G., Davy, S., Spajer, M., Courjon, D., Cricenti, A., ...
We used a combination of internal photoemission and of near-field optical microscopy (SNOM) to study the lateral Variations in solid interface properties such as energy barriers and electron-hole...
Shell filling in non-linear magneto-tunneling spectroscopy of vertical quantum dots (1998)
Jouault, B., Faini, G., Angelucci, A., Di Stasio, M., Santoro, G., Tagliacozzo, A., ...
We report on non-linear magneto-tunneling experiments carried out in single GaAs vertical quantum dots. We show that conduction at low voltage bias can be a spectroscopic tool for both the ground...
Jouault, B., Boero, M., Faini, G., Inkson, J. C.
A study of magneto-transport through quantum dots is presented. The model allows to analyze tunnelling both from bulk-like contacts and from 2D accumulation layers. The fine features in the I-V...
Jouault, B., Holder, J. P., Boero, M., Faini, G., Laruelle, F., Bedel, E., ...
We present an experimental and theoretical study of electron tunnelling through quantum dots which focusses the attention on the amplitude of the current peaks as a function of magnetic field. We...
NEW ASPECTS OF THE PHASE DIAGRAM OF THE FIELD INDUCED SPIN DENSITY WAVES IN (TMTSF)2 ClO4 (1988)
Faini, G., Pesty, F., Garoche, P.
Thermodynamic properties of the field induced spin density waves have been investigated by magnetocalorimetric measurements. In the relaxed state a treelike phase diagram is observed. These new...
NEW ASPECTS OF THE PHASE DIAGRAM OF THE FIELD INDUCED SPIN DENSITY WAVES IN (TMTSF)2 ClO4 (1988)
Faini, G., Pesty, F., Garoche, P.
Thermodynamic properties of the field induced spin density waves have been investigated by magnetocalorimetric measurements. In the relaxed state a treelike phase diagram is observed. These new...
NEW ASPECTS OF THE PHASE DIAGRAM OF THE FIELD INDUCED SPIN DENSITY WAVES IN (TMTSF)2 ClO4 (1988)
Faini, G., Pesty, F., Garoche, P.
Thermodynamic properties of the field induced spin density waves have been investigated by magnetocalorimetric measurements. In the relaxed state a treelike phase diagram is observed. These new...
Magnetization reversal of exchange bias double layers magnetically patterned by ion irradiation
Fassbender, J., Poppe, S., Mewes, T., Mougin, A., Hillebrands, B., Engel, D., ...
He+ion irradiation is an excellent tool to modify the magnitude and direction of the exchange bias field on the sub- micrometer scale without affecting the sample topography. This effect has been...
Magnetization reversal of exchange bias double layers magnetically patterned by ion irradiation
Fassbender, J., Poppe, S., Mewes, T., Mougin, A., Hillebrands, B., Engel, D., ...
He+ion irradiation is an excellent tool to modify the magnitude and direction of the exchange bias field on the sub- micrometer scale without affecting the sample topography. This effect has been...