Search Results - (Author, Cooperation:A. Barthelemy)

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  1. 1
    Staff View
    Publication Date:
    2018-01-30
    Publisher:
    Nature Publishing Group (NPG)
    Electronic ISSN:
    2041-1723
    Topics:
    Biology
    Chemistry and Pharmacology
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2011-01-14
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Staff View
    Publication Date:
    2018-06-22
    Publisher:
    The American Society for Microbiology (ASM)
    Print ISSN:
    0019-9567
    Electronic ISSN:
    1098-5522
    Topics:
    Medicine
    Published by:
    http://www.asm.org/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Cabanel, R. ; Etienne, P. ; Lequien, S. ; Creuzet, G. ; Barthélémy, A. ; Fert, A.

    [S.l.] : American Institute of Physics (AIP)
    Published 1990
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The magnetic properties of (001)bcc Fe/(001)fcc Ag superlattices grown by molecular-beam epitaxy on (001) GaAs and characterized by reflection high-energy electron diffraction, Auger spectroscopy, and x-ray diffraction are presented. From magnetization (SQUID) and torque experiments, the strong interface uniaxial anisotropy which tends to align the magnetization along the normal to the layers is determined. This interface anisotropy overcomes the demagnetizing field effect when the thickness of the Fe layers decreases below 10 A(ring). The anisotropy constant Ku is derived from both experiments, which leads to 0.8 erg/cm2 for the interface anisotropy constant Ks.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.344569

    Articles: DFG German National Licenses
  5. 5
    Childress, J. R. ; Duvail, J. L. ; Jasmin, S. ; Barthélémy, A. ; Fert, A. ; Schuhl, A. ; Durand, O. ; Galtier, P.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We have grown face-centered cubic (FCC) (111)- and (001)-oriented CoxPd1−x alloy films (x≈0.20–0.25) by molecular beam epitaxy on (111)Si and (001)MgO substrates, respectively, with thicknesses ≈200–1000 A(ring). Magnetization (SQUID) measurements show that both (111) and (100) films present a perpendicular easy axis, indicating that a strong magnetic anisotropy overcomes the demagnetizing field favoring the in-plane orientation. We have studied this magnetic anisotropy by combining SQUID and torque measurements. Our experimental results cannot be accounted for by only invoking the magnetocrystalline anisotropy of a disordered solid solution of Co in FCC Pd, and rather indicate an anisotropic distribution of Co in the Pd host.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.355368

    Articles: DFG German National Licenses
  6. 6
    Vouille, C. ; Fert, A. ; Barthélémy, A.

    [S.l.] : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We present CPP-GMR experiments on a series of multilayers of the type (A/Cu/Co/Cu)×N where A is a layer of NiCr, FeCr, or FeV alloys with concentrations of Cr or V between 2.5 and 30 at. %. The inverse GMR effects we observe can be accounted for by the opposite scattering spin asymmetries in Co (positive spin asymmetry) and A (negative spin asymmetry). As the spin asymmetry in A is positive for interface scattering and negative for bulk scattering, the inverse GMR is observed only for thicknesses greater than one at which interface and bulk scattering compensate. We determine the magnitude and sign of the spin asymmetry coefficients, and we notice the agreement with previous data on dilute alloys and with theoretical calculations. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.365432

    Articles: DFG German National Licenses
  7. 7
    Etienne, P. ; Massies, J. ; Nguyen-Van-Dau, F. ; Barthélémy, A. ; Fert, A.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1989
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    It is shown that high quality Ag/Fe superlattices can be grown on (001) GaAs by molecular beam epitaxy, provided that adequate intermediate layers are interposed between the GaAs substrate and the superlattice structure. In addition to the growth of a GaAs buffer layer, a sufficiently thick Fe nucleation layer is necessary for the further growth of a high quality Ag buffer layer showing clear reflection high-energy electron diffraction intensity oscillations. This growth sequence ensures the obtention of single-crystal Ag/Fe superlattices with well-defined interfaces.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.102069

    Articles: DFG German National Licenses
  8. 8
    Stelmakh, N. ; Lourtioz, J-M. ; Barthelemy, A.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1991
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Injection of a weak cw radiation in a Q-switched AlGaAs laser diode is shown to produce single-mode pulses with a quasi-linear downchirp of very large amplitude. Strong pulse compression can be achieved by using single-mode dispersive fibers at the laser output. Time-resolved spectroscopic measurements of the laser pulses are presented. Optical solitary pulses shorter than 2 ps are obtained after compression, which corresponds to a pulse compression factor larger than 15. Although the laser-fiber coupling is not fully optimized, peak powers exceeding 3 W are measured at the fiber output. These performances are believed to be the best ever reported for an electrically pumped Q-switched AlGaAs laser diode.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.105404

    Articles: DFG German National Licenses
  9. 9
    Etienne, P. ; Lequien, S. ; Nguyen-Van-Dau, F. ; Cabanel, R. ; Creuzet, G. ; Friederich, A. ; Massies, J. ; Fert, A. ; Barthélémy, A. ; Petroff, F.

    [S.l.] : American Institute of Physics (AIP)
    Published 1990
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Ag/Fe, Ag/Cr, and Fe/Cr superlattices grown on GaAs (001) by molecular-beam epitaxy are compared on the basis of their structural properties. Highly ordered superlattices with very sharp interfaces are obtained for Ag-based structures (Ag/Fe, Ag/Cr). Although several attempts have been made to improve the growth process of Fe/Cr superlattices, they are far from being so well defined. This is a consequence of a progressive degradation which occurs when the superlattice thickness increases and becomes clearly observable in reflection high-energy electron diffraction above roughly 300 A(ring). However, using an optimum growth temperature, reasonably well-defined structures, suitable for subsequent magnetic studies, are obtained.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.344566

    Articles: DFG German National Licenses
  10. 10
    Morel, R. ; Barthélémy, A. ; Charrière, F. ; Childress, J. R. ; Fert, A. ; Bellamy, B. ; Masson, A.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We report on the preparation and characterization of clusters of Co deposited on MgO(001) and MgO(110) substrates. The preparation is by cell evaporation in ultrahigh vacuum. The size of the clusters is controlled by the substrate temperature and deposition rate or, after deposition, by annealing. This results in clusters with diameters ≈100–1500 A(ring) and heights ≈30–200 A(ring). The characterization is by Rutherford backscattering, photoemission spectroscopy, and atomic force microscopy. The magnetic properties have been investigated by SQUID magnetometry. Depending on the size of the clusters, we have observed superparamagnetic or ferromagnetic behaviors. When the cluster diameter is much smaller than its height, the magnetization is much easier for in-plane fields, due to the demagnetization energy. In some of the samples, we have combined clusters of Co and nonmagnetic Ag, with sufficient density for metallic percolation, and we present their magnetoresistance properties.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.356899

    Articles: DFG German National Licenses
  11. 11
    Barthélémy, A. ; Fert, A. ; Baibich, M. N. ; Hadjoudj, S. ; Petroff, F. ; Etienne, P. ; Cabanel, R. ; Lequien, S. ; Nguyen Van Dau, F. ; Creuzet, G.

    [S.l.] : American Institute of Physics (AIP)
    Published 1990
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We describe the magnetic and transport properties of Fe(001)/Cr(001) superlattices grown on GaAs (001) by molecular-beam epitaxy and characterized by reflection high-energy electron diffraction (RHEED), Auger spectroscopy, x-ray diffraction, and electron microscopy. For Cr layers thinner than about 30 A(ring) the magnetic behavior reveals strong antiferromagnetic couplings between the Fe layers across the Cr layers. Polarized neutron diffraction experiments confirm the existence of an antiferromagnetic superstructure. We discuss the origin of the antiferromagnetic (AF) coupling. The Fe/Cr superlattices with AF interlayer coupling exhibit a giant magnetoresistance: when an applied field aligns the magnetizations of the Fe layers, the resistivity drops by a factor of 2 for some samples. This giant magnetoresistance can be ascribed to the spin dependence of the electron scattering by interfaces. We compare our results with the predictions of two recent theoretical models.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.346013

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    0014-5793
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0014-5793(77)80603-0

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    0030-4018
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0030-4018(94)90691-2

    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    0030-4018
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0030-4018(91)90453-K

    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    0921-4526
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4526(92)90555-7

    Articles: DFG German National Licenses
  16. 16
    Staff View
    ISSN:
    0304-8853
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)91562-8

    Articles: DFG German National Licenses
  17. 17
    Staff View
    ISSN:
    0304-8853
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0304-8853(93)91201-H

    Articles: DFG German National Licenses
  18. 18
    Staff View
    ISSN:
    0304-8853
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)91521-T

    Articles: DFG German National Licenses
  19. 19
    Staff View
    ISSN:
    0304-8853
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0304-8853(93)91201-H

    Articles: DFG German National Licenses
  20. 20
    Staff View
    ISSN:
    0304-8853
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0304-8853(91)90310-7

    Articles: DFG German National Licenses